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1Back to top Go down   Bike starting issue/fuel issue Empty Bike starting issue/fuel issue Tue Nov 07, 2017 3:35 pm

rxbbie

rxbbie
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Hi All,

First of all, thank-you for all the great posts and information on this website, you have made my K100 build a lot easier.

I'm having an issue getting my K100 to start. For the past few months I've had absolutely no issues, the bike would turn over and start first time every time. However, I was out for a ride on Sunday and after about 10 miles the bike started cutting out anytime the revs went below roughly 1k, I couldn't get it to comfortably go above 3-4k without it juddering. When I eventually got the bike home I left it for a while then went out to try start it, no joy. It keeps turning over and every so often lets out a slight grunt as if it's trying but won't go the full way.
My first thought was that the bike was starved of fuel, I had recently removed the tank and thought maybe upon putting the fuel hose back on, I had damaged the lining. I replaced the fuel hose tonight (taking of air filter etc) but still the same issue... is it possible I have let air in to the system or damaged the filter?

On a (hopefully) unrelated note, when I leave the bike for a while on the centre stand there's white smoke when I start it up. 

Any help would be much appreciated.

Thanks,
Robbie

    

2Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Tue Nov 07, 2017 5:55 pm

MartinW

MartinW
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First check to see whether the spark plugs are wet or dry. The 4 pin connector under the RH side of the tank that supplies power to the pump is a known source of problems. If the bike is stored in a cold place the white smoke could be water condensation.
Regards Martin.

    

3Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 4:22 am

Garyk100

Garyk100
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just a thought, how old is the fuel filter or how good has the fuel been, dirty fuel filters create crappy running conditions, I read that in a book somewhere


__________________________________________________
The early bird catches the worm, but the second mouse gets the cheese

1991 K100rs16v
    

4Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 1:15 pm

rxbbie

rxbbie
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active member

    

5Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 1:16 pm

rxbbie

rxbbie
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Garyk100 wrote:just a thought, how old is the fuel filter or how good has the fuel been, dirty fuel filters create crappy running conditions, I read that in a book somewhere
I will need to check, I've had the bike for a year and I haven't changed it yet.

    

6Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 1:18 pm

rxbbie

rxbbie
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MartinW wrote:First check to see whether the spark plugs are wet or dry. The 4 pin connector under the RH side of the tank that supplies power to the pump is a known source of problems. If the bike is stored in a cold place the white smoke could be water condensation.
Regards Martin.
I will check the spark plugs tomorrow, the 4 pin connector is ok, I recently cleaned all the wiring up on it and the pump seems to be running fine. Thanks.

    

7Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 3:31 pm

Laitch

Laitch
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For how long has the white smoke on start up been occurring? Does it occur other times than just at startup?


__________________________________________________
1995 K75 90,000 miles
    

8Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 3:48 pm

rxbbie

rxbbie
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active member
Laitch wrote:For how long has the white smoke on start up been occurring? Does it occur other times than just at startup?
It usually keeps smoking until I ride it. As soon as I get the wheels moving it will disappear. However, if I leave the bike for even 24 hours then start it up in my garage the white smoke will come back.

    

9Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 3:50 pm

MartinW

MartinW
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Check cooling system level are you using coolant?
Regards Martin.

    

10Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 3:56 pm

92KK 84WW Olaf

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Just keep an eye on your coolant in case you are losing some. Watch the coolant bottle but also keep an eye on the filler at the radiator. That means sliding the tank back a little, something you can do if you put new longer fuel lines on it. If you still have original fuel lines that something you need to do as they crack with age.

But rather weirdly many years back a car I had always gave off loads of white smoke on start up, never lost coolant or issues. But this time of year the white smoke is likely to be the exhaust gases being warm hitting the cold air and immediately condensing the water vapour into fog. If you are running rich this is more likely to happen too.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

11Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 3:59 pm

rxbbie

rxbbie
active member
active member
92KK 84WW Olaf wrote:Just keep an eye on your coolant in case you are losing some. Watch the coolant bottle but also keep an eye on the filler at the radiator. That means sliding the tank back a little, something you can do if you put new longer fuel lines on it. If you still have original fuel lines that something you need to do as they crack with age.

But rather weirdly many years back a car I had always gave off loads of white smoke on start up, never lost coolant or issues. But this time of year the white smoke is likely to be the exhaust gases being warm hitting the cold air and immediately condensing the water vapour into fog. If you are running rich this is more likely to happen too.

Thanks for the advice. I've just bought some new coolant, I'll drain the existing and replace it with fresh stuff tomorrow and see if it helps. 

I've also just purchased a new fuel filter and new spark plugs from motobricks, which will hopefully fix the starting issue.

    

12Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Wed Nov 08, 2017 4:06 pm

92KK 84WW Olaf

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A tip if you are draining coolant.

Don't use the drain plug, open the hose off the water pump instead and drain it out there. Flush it with a slow running hose into the radiator filler. Don't forget to put the hose back!

Put in a full 2 litres of coolant and top it off with DI water up to level, that way you don't have the hassle of measuring and mixing coolant and you will have the right quantity of coolant in it. You need to lean the bike left and right to get the air bubbles out and turn it over [the engine, not the bike].

The dribble of coolant left in the container with about 200ml of DI water will go in the coolant reservoir.

If the sight tube on the reservoir is darkened see about a clear piece of tube as a replacement.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

13Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 9:10 am

rxbbie

rxbbie
active member
active member
92KK 84WW Olaf wrote:A tip if you are draining coolant.

Don't use the drain plug, open the hose off the water pump instead and drain it out there. Flush it with a slow running hose into the radiator filler. Don't forget to put the hose back!

Put in a full 2 litres of coolant and top it off with DI water up to level, that way you don't have the hassle of measuring and mixing coolant and you will have the right quantity of coolant in it. You need to lean the bike left and right to get the air bubbles out and turn it over [the engine, not the bike].

The dribble of coolant left in the container with about 200ml of DI water will go in the coolant reservoir.

If the sight tube on the reservoir is darkened see about a clear piece of tube as a replacement.

Unfortunately I only bought 1L of coolant to top it up, or else I would have drained the whole thing.

    

14Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 10:54 am

Laitch

Laitch
Life time member
Life time member
rxbbie wrote:My first thought was that the bike was starved of fuel . . .
Unfortunately I only bought 1L of coolant to top it up, or else I would have drained the whole thing.
What is the model and year of your bike, rxbbie? Changes in components occur various years. If you put the year and model of your bike in your profile, it will show up beneath all your posts. That way members won't need to backtrack to find out what's being discussed.

If you have enough coolant to top up the system and fill the coolant reservoir to a suitable gauge level, that's all you need right now.

To recap:
Martin suggested that you determine if the plugs are wet or dry after failure to start. What were the results of your doing that? Wet plugs would indicate overfueling. One of the causes of that is defective coolant temperature sensor operation.

Olaf suggested being aware of the coolant level in your bike's coolant reservoir. That would also require your filling the coolant reservoir to between the Min and Max levels on its tube gauge once the radiator is topped up. Have you done that? A reason to do that would be to determine if the "white smoke" is from coolant leaking through a blown head gasket into a combustion chamber when the engine is warm. A coolant level drop in the reservoir's gauge could eventually indicate that if viewed when the engine is cold.


__________________________________________________
1995 K75 90,000 miles
    

15Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 11:09 am

92KK 84WW Olaf

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I will add a little tip too, make sure the coolant in the radiator cap is up to the top. However it can still drop slightly as air is expelled/extracted. This will cause the coolant reservoir to drop slightly. Not normally an issue unless you are monitoring for head gasket problems and you end up getting a false reading scare. So its worth going back after a few hundred miles and topping it off. Then run your coolant checks on the sight tube. That's why I like a nice new sight tube, gets even easier if you have almost pure coolant in it too, easier to see.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

16Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 11:47 am

rxbbie

rxbbie
active member
active member
92KK 84WW Olaf wrote:I will add a little tip too, make sure the coolant in the radiator cap is up to the top. However it can still drop slightly as air is expelled/extracted. This will cause the coolant reservoir to drop slightly. Not normally an issue unless you are monitoring for head gasket problems and you end up getting a false reading scare. So its worth going back after a few hundred miles and topping it off. Then run your coolant checks on the sight tube. That's why I like a nice new sight tube, gets even easier if you have almost pure coolant in it too, easier to see.

So I should top the filler cap under the tank up to full, then fill the overflow tank to a suitable level also?

    

17Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 12:34 pm

Laitch

Laitch
Life time member
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rxbbie wrote:
92KK 84WW Olaf wrote:I will add a little tip too, make sure the coolant in the radiator cap is up to the top. However it can still drop slightly as air is expelled/extracted. This will cause the coolant reservoir to drop slightly. Not normally an issue unless you are monitoring for head gasket problems and you end up getting a false reading scare. So its worth going back after a few hundred miles and topping it off. Then run your coolant checks on the sight tube. That's why I like a nice new sight tube, gets even easier if you have almost pure coolant in it too, easier to see.

So I should top the filler cap under the tank up to full, then fill the overflow tank to a suitable level also?
Yes. Fill the coolant reservoir to a level between the Min and Max lines.


__________________________________________________
1995 K75 90,000 miles
    

18Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 12:41 pm

rxbbie

rxbbie
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Laitch wrote:
rxbbie wrote:
92KK 84WW Olaf wrote:I will add a little tip too, make sure the coolant in the radiator cap is up to the top. However it can still drop slightly as air is expelled/extracted. This will cause the coolant reservoir to drop slightly. Not normally an issue unless you are monitoring for head gasket problems and you end up getting a false reading scare. So its worth going back after a few hundred miles and topping it off. Then run your coolant checks on the sight tube. That's why I like a nice new sight tube, gets even easier if you have almost pure coolant in it too, easier to see.

So I should top the filler cap under the tank up to full, then fill the overflow tank to a suitable level also?
Yes. Fill the coolant reservoir to a level between the Min and Max lines.

Thanks, I feel like an idiot now. I installed a new coolant reservoir but I thought it was an overflow tank so didn't fill it at all. This might be the problem.


__________________________________________________
1987 BMW K100 RTC
    

19Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 12:52 pm

Laitch

Laitch
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rxbbie wrote:Thanks, I feel like an idiot now. I installed a new coolant reservoir but I thought it was an overflow tank so didn't fill it at all. This might be the problem.
You aren't an idiot although it's good to be in touch with your feelings—so I'm told anyway. Laughing  You're inexperienced. You should have at least two manuals to use while working. One might clarify the other. They're downloadable all over the place. Here's an extract from a BMW workshop manual download. Methods in it will work and Olaf has offered alternatives.
Bike starting issue/fuel issue K-bike10


__________________________________________________
1995 K75 90,000 miles
    

20Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 1:19 pm

92KK 84WW Olaf

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We have all likely been there at some point, which is why we share experiences on the forum. There is nothing like organic learning to give one some degree of confidence and a willingness to try other tasks. Also keeps us out of trouble down the road. Asking questions and sharing information is the key so don't be afraid to ask questions. The forum is there to help those inexperienced with Ks with or without other experience so we all learn from each other.

Anyway isn't it a good outcome if all the issue was is a mistake!!!!!


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

21Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 3:28 pm

rxbbie

rxbbie
active member
active member
92KK 84WW Olaf wrote:We have all likely been there at some point, which is why we share experiences on the forum. There is nothing like organic learning to give one some degree of confidence and a willingness to try other tasks. Also keeps us out of trouble down the road. Asking questions and sharing information is the key so don't be afraid to ask questions. The forum is there to help those inexperienced with Ks with or without other experience so we all learn from each other.

Anyway isn't it a good outcome if all the issue was is a mistake!!!!!

Indeed, thanks for your help. I just need to sort the main issue now which is the bike not starting!


__________________________________________________
1987 BMW K100 RTC
    

22Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 4:09 pm

MartinW

MartinW
Life time member
Life time member
After the failure to start are the spark plugs wet or dry? This information is needed to determine the next step.
Regards Martin.

    

23Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Thu Nov 09, 2017 4:17 pm

rxbbie

rxbbie
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active member
MartinW wrote:After the failure to start are the spark plugs wet or dry? This information is needed to determine the next step.
Regards Martin.

Apologies, I've not had a chance to check the bike yet. I'll check the spark plugs tomorrow.


__________________________________________________
1987 BMW K100 RTC
    

24Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 1:52 pm

rxbbie

rxbbie
active member
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MartinW wrote:After the failure to start are the spark plugs wet or dry? This information is needed to determine the next step.
Regards Martin.

Got the spark plugs out today, they were very wet. (See pic below)Bike starting issue/fuel issue Img_4310

Put the new spark plugs in and changed the fuel filter also topped up the coolant to the proper level and the bike started up no problem. Could the low coolant level and wet spark plugs be related?


__________________________________________________
1987 BMW K100 RTC
    

25Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 4:37 pm

Laitch

Laitch
Life time member
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rxbbie wrote:Got the spark plugs out today, they were very wet. (See pic below) Could the low coolant level and wet spark plugs be related?
They're on the same bike so that makes them related, Laughing but besides that, I don't think so.
What were the gaps on the old plugs you replaced? It looks mighty wide on the one in that photo. That might inhibit ignition and give them a fuel bath.



Last edited by Laitch on Sat Nov 11, 2017 6:55 pm; edited 1 time in total


__________________________________________________
1995 K75 90,000 miles
    

26Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 4:54 pm

MartinW

MartinW
Life time member
Life time member
The bike looks like it is flooding. Remove the No 6 fuse marked Kraftstoppe , this will disable the fuel pump stopping the pump from supplying more fuel while you try and start it. Try and start the bike it should start on the residual unburnt fuel residing in the combustion chamber. The bike should start, and as the bike starts to die ram the fuse back in. As it requires someone to manipulate the throttle a second person is handy. The bike should be running albeit badly, it and will require a lot of throttle manipulation to keep it running. If this succeeds the problem is probably a faulty temperature switch or temperature switch connection. test and clean both. The test values are on this site. I have managed to limp home with this condition, by sticking to back roads.
Regards Martin.

    

27Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 6:47 pm

Point-Seven-five

Point-Seven-five
Life time member
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If you don't have a second pair of hands to do the #6 fuse thing, another way to get started is to unplug the the four pin fuel tank connector and crank the engine for about 10 seconds or until it tries to start.  This will pump the excess fuel out of the cylinders and dry the plugs enough to fire.

Reconnect the tank and start the engine.  If your bike has the Motronic ECU with the interlock that prevents the fuel pump when the sidestand is down, you can put the bike on the centerstand with the side stand down, crank the engine until it tries to start on the residual fuel and flip the sidestand up to start the fuel pump.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

28Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 7:57 pm

rxbbie

rxbbie
active member
active member
Point-Seven-five wrote:If you don't have a second pair of hands to do the #6 fuse thing, another way to get started is to unplug the the four pin fuel tank connector and crank the engine for about 10 seconds or until it tries to start.  This will pump the excess fuel out of the cylinders and dry the plugs enough to fire.

Reconnect the tank and start the engine.  If your bike has the Motronic ECU with the interlock that prevents the fuel pump when the sidestand is down, you can put the bike on the centerstand with the side stand down, crank the engine until it tries to start on the residual fuel and flip the sidestand up to start the fuel pump.

Thanks for the info. Is the point in this to temporarily burn any excess fuel resting in the engine? Is there any reasons as to why the plugs would flood in the first place?


__________________________________________________
1987 BMW K100 RTC
    

29Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 10:03 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I can't say for sure why my bikes flooded(it's happened to me twice in about 45,000 miles).  It happened to me on a cold start each time. 

I suspect that the rich mixture on cold start floods the spark plugs preventing a spark hot enough to fire the mixture.  Continuing to crank the starter just puts more fuel in the cylinder making the situatuion worse.  Cranking the engine with the pump shut down blows the excess fuel out of the cylinder until what remains can be ignited.

Because the mixture has been enriched by the ECU it is important that the throttle is NOT opened when starting.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

30Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sat Nov 11, 2017 10:40 pm

Inge K.

Inge K.
VIP
VIP
Point-Seven-five wrote:
Because the mixture has been enriched by the ECU it is important that the throttle is NOT opened when starting.

......but have a wide open throttle when turning the starter to dry the plugs.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

31Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sun Nov 12, 2017 6:44 am

rxbbie

rxbbie
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active member
So keep the throttle open when starting the bike and then close it when it turns over?

I had planned a ride today, is it safe to ride the bike or do I just risk damaging the bike again?


__________________________________________________
1987 BMW K100 RTC
    

32Back to top Go down   Bike starting issue/fuel issue Empty Re: Bike starting issue/fuel issue Sun Nov 12, 2017 7:15 am

MartinW

MartinW
Life time member
Life time member
If it starts using either Point Seven Fives procedure or mine, the possible cause is the temperature sender or it's connector. Clean and test. This fault will give faulty information to the ECU causing it to add more fuel. 
Regards Martin.

    

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