BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   K100 with Issues Empty K100 with Issues Fri Jul 23, 2021 3:33 am

BadgerinNC

BadgerinNC
active member
active member
I have a 1987 K100 that I bought a couple years ago and up until now it has been trouble free.
I was out riding with some buddies a couple weeks ago and all was fine until the low fuel light came on. Which may or may not mean anything.  Soon after the bike started missing and eventually died on me. It sat a few minutes and then started and I made it a quarter mile before it died again. Same thing again. 
Luckily where it last died there was a guy out doing lawn work and he offered to trailer the bike home for me.
So it sat in the shop overnight and the next day it started right away. Ran for about 15 seconds and when it died the starter kicked in all by itself. Odd, eh?
So with work and whatnot I haven't had time to mess with it, but tonight when I got home I pulled the tank off to start cleaning electrical connections and grounds. And I discovered that sometime in the past someone decided that the fuel system didn't need a fuel filter.

So I'm sure I have some electrical gremlins and perhaps also clogged injectors from not having a fuel filter?

I am a newbie so if anyone can point me to the best place to start I would appreciate it.

Thanks in advance!

Dave

    

2Back to top Go down   K100 with Issues Empty Issues Fri Jul 23, 2021 4:02 am

daveyson

daveyson
Life time member
Life time member
Hi Dave, 

You removed the tank to clean electrical connections and discovered it doesn't have a fuel filter. I hope your not aware that the filter is inside the tank, not under it, then this post might be helpful. If you are aware, you might think I've just told you to suck eggs, then sorry about that, but I dunno which way it is.  Since you have it for years without seeing a filter adds to my guess you expected it under the tank (and it hasn't been changed in years) Bricks are different in a lot of ways. The filter might be blocking.

Regards, Dave.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

3Back to top Go down   K100 with Issues Empty Re: K100 with Issues Fri Jul 23, 2021 6:39 am

Corkboy

Corkboy
Life time member
Life time member
@BadgerinNC wrote:So it sat in the shop overnight and the next day it started right away. Ran for about 15 seconds and when it died the starter kicked in all by itself. Odd, eh?

Dave
 Hi Dave,
If Daveyson is right, a new fuel filter will solve your problems. It is in the tank and needs to be replaced.

The starter running by itself (which it was doing when the bike was running I'd guess, you just didn't hear it) is a common problem with old or discharged batteries. The power drain of starting causes the starter relay contacts to fuse\weld together. It might be fixable (I've done it with a tap of a hammer to seperate them).  Search for tthe problem and fixes.

Ultimate fix is a new battery.


__________________________________________________
Regards,

Corkboy '87 K100RS SE (The black one - one of the two bikes I'm sorry I sold)
             '87 K100RS 0140995 (Gone)
             '97 K1100LT 0188024 (Gone)
             '08 K1200GT Wedge - but still a K
             '08 Transalp 700
    

4Back to top Go down   K100 with Issues Empty Re: K100 with Issues Fri Jul 23, 2021 8:44 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
With the tank low on fuel, it's a good chance that any old dirt in the tank would get stirred up and sent to the filter to clog things up.

Remove the filler cap and take a good look inside. If there is anything that isn't fuel in there you should plan on getting it out. A new fuel filter goes in when you're done.

Charge the battery and clean the contacts in the starter relay. Then you should be good to go again.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   K100 with Issues Empty Re: K100 with Issues Sun Jul 25, 2021 5:58 pm

BadgerinNC

BadgerinNC
active member
active member
Thanks for your input. I know there is supposed to be a fuel filter in the tank, but there isn't one. Just the screen under the pump.
The tank is fairly clean, a little surface rust in places, probably from the ethanol in the gas. So being this bike has been running since before i bought it without a fuel filter is there a chance the injectors are plugged?
I put in a new battery this year, the old one was too dead to take a charge. So I doubt the starter was stuck. And it started fine after that when I tried it.

Basically it is a process of elimination. Check all connections, check all grounds and maybe pull the injectors and give them a clean.
Any parts that tend to fail that might be the culprit?

I just don't want to be stranded in the mountains of western North Carolina. The chances of running across another kindly soul who would trailer my bike home are probably somewhere in the vicinity of slim to none.

Dave

    

6Back to top Go down   K100 with Issues Empty Re: K100 with Issues Sun Jul 25, 2021 7:29 pm

Laitch

Laitch
Life time member
Life time member
@BadgerinNC wrote:The chances of running across another kindly soul who would trailer my bike home are probably somewhere in the vicinity of slim to none.
Your chances seem to be far better than that based on your story.  Smile First fail gets immediate help. cheers Only a negativist would believe that was unrepeatable. Very Happy

It's a process of elimination, alright. Are the plugs wet or dry after starting attempts fail? If they're dry, can you hear the fuel pump whining for a second or two after a starting attempt? If it isn't whining, replace fuse #6 and try again. If that starts the pump but not the engine, is fuel pumping from the hose attached to the rail? Don't light up yourself checking.  Smile


__________________________________________________
1995 K75 81,000 miles
K100 with Issues Usa-lo10
    

7Back to top Go down   K100 with Issues Empty No go Sun Jul 25, 2021 7:59 pm

daveyson

daveyson
Life time member
Life time member
Sounds like maybe blocked injectors and a stuck starter relay, but if you're confident the starter wasn't going the whole time, feel if the stater button is being pushed off by a spring when you release it. 

It's unlikely but some owners (like the previous owner of the bike in my avatar, as you can only just see) install a filter outside the tank.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

8Back to top Go down   K100 with Issues Empty Re: K100 with Issues Sun Jul 25, 2021 11:20 pm

BadgerinNC

BadgerinNC
active member
active member
@Laitch wrote:
@BadgerinNC wrote:The chances of running across another kindly soul who would trailer my bike home are probably somewhere in the vicinity of slim to none.
Your chances seem to be far better than that based on your story.  Smile First fail gets immediate help. cheers Only a negativist would believe that was unrepeatable. Very Happy

it's one thing to happen upon someone 15 minutes away who used to live three houses down from me and have the same outcome when you are 150 miles away. No negative, just realistic.

The maddening thing is the bike would start and run fine in the shop. I guess I just don't trust it to keep running if I go any distance. There has to be something wrong and I would just as soon figure it out here than out in the middle of nowhere.

Is there some component on these bikes that would fail if it gets hot, causing the bike to start missing and die? And would be just fine once it cooled down?

I'll just keep poking around until I figure it out.

    

9Back to top Go down   K100 with Issues Empty Issues Sun Jul 25, 2021 11:36 pm

daveyson

daveyson
Life time member
Life time member
Hall sensors.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

10Back to top Go down   K100 with Issues Empty Re: K100 with Issues Mon Jul 26, 2021 2:21 am

MartinW

MartinW
Life time member
Life time member
Try using a hot air gun on the Hall Effect Sensor cover plate,  coils or any electrical components that can fail intermittently due to heat.
Regards Martin.


__________________________________________________
K75s Hybrid
    

11Back to top Go down   K100 with Issues Empty Re: K100 with Issues Mon Jul 26, 2021 1:41 pm

BadgerinNC

BadgerinNC
active member
active member
The hall effect sensor is another item on my radar. I need to study up on testing it so I don't fry it if it isn't bad.

    

12Back to top Go down   K100 with Issues Empty Re: K100 with Issues Tue Jul 27, 2021 2:56 am

BadgerinNC

BadgerinNC
active member
active member
Tonight after work I decided to pull the ignition switch and give it a cleaning, I have read that a dirty switch could cause issues so i figured with the tank off now would be the time to do it.
I got the paint out of the setscrew hole, assuming the setscrew would be an allen screw. Of course it isn't and I didn't have a jewelers screwdriver so I found a suitable piece of metal and made one.
The switch was actually pretty clean. I polished everything up and was wondering what is the best grease to use before I reassemble.
Lots of opinions out there, everything from Vaseline to dielectric grease to TriFlow. 

What say ye?

    

13Back to top Go down   K100 with Issues Empty Re: K100 with Issues Tue Jul 27, 2021 9:01 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
If you have it, and you should, give the interior a quick shot of Deoxit. Besides being a corrosion remover Deoxit leaves a protective film that doesn't interfere with conductivity.

If you don't have that, get a pack of the gel that goes on light bulbs from the auto parts store and put a light film on all the parts.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

14Back to top Go down   K100 with Issues Empty Re: K100 with Issues Tue Jul 27, 2021 10:43 am

Laitch

Laitch
Life time member
Life time member
@Point-Seven-five wrote:If you have it, and you should, give the interior a quick shot of Deoxit. .
The Music Stop in Clemmons is liable to have some DeoxIT D5 hanging on their wall of stuff.


__________________________________________________
1995 K75 81,000 miles
K100 with Issues Usa-lo10
    

15Back to top Go down   K100 with Issues Empty Re: K100 with Issues Wed Jul 28, 2021 12:41 am

BadgerinNC

BadgerinNC
active member
active member
I know I had some Deoxit once upon a time. It may have vanished when I moved down here.
If I can't find it I will pick some up.

I'll try the Music Stop, I know they used some on my old Sansui to bring it back again. And they may have some interesting vinyl there too.

    

16Back to top Go down   K100 with Issues Empty Re: K100 with Issues Thu Jul 29, 2021 2:20 am

BadgerinNC

BadgerinNC
active member
active member
Found the DeoxIT 100, the DeoxIT Gold and an old can of Radio Shack contact cleaner. Surprised me, but I have the key switch sorted and back on the bike.

I took off the fuel rail and will be pulling the injectors to refurbish them.
But then I saw these on Ebay: 
https://www.ebay.com/itm/231974623891?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200818143230%26meid%3D8fc16e701c534630a84547b30eab39f7%26pid%3D101224%26rk%3D2%26rkt%3D5%26sd%3D254151923845%26itm%3D231974623891%26pmt%3D1%26noa%3D1%26pg%3D2047675%26algv%3DDefaultOrganic%26brand%3DMOSTPLUS&_trksid=p2047675.c101224.m-1

For the price it seems like a good deal. Anyone have experience with these or similar? Or should I just pick up a rebuild kit and stick with the Bosch?

    

17Back to top Go down   K100 with Issues Empty Re: K100 with Issues Thu Jul 29, 2021 2:54 am

Dan Pete

Dan Pete
Silver member
Silver member
I looked at the fleabay link, and am very interested in anyone experience, since I have a k75 that I know need injectors cleaned, at the very least!

    

18Back to top Go down   K100 with Issues Empty Re: K100 with Issues Thu Jul 29, 2021 3:41 am

MartinW

MartinW
Life time member
Life time member


__________________________________________________
K75s Hybrid
    

19Back to top Go down   K100 with Issues Empty Re: K100 with Issues Thu Jul 29, 2021 9:49 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I have a very lightly used set of those cheap injectors I will sell you for $25. They didn't work in my K100, but maybe will work in yours.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

20Back to top Go down   K100 with Issues Empty Re: K100 with Issues Thu Jul 29, 2021 10:17 am

Laitch

Laitch
Life time member
Life time member
@BadgerinNC wrote:For the price it seems like a good deal. Anyone have experience with these or similar? Or should I just pick up a rebuild kit and stick with the Bosch?
The ad copy description information states it has a single hole disc; the photos show it has a four-hole disc. This obvious discrepancy in the product's description calls into question everything about both the product and the seller. If it actually is a four-hole injector, they often seem to be reviewed as delivering less fuel economy and not necessarily delivering better performance, as Martin's link indicates.

Mr. Injector will service your injectors at a reasonable cost and has received many complimentary reviews from Brick riders in the USA.

For just the relatively cheap thrill of discovering whether your moto has a magical aura, Point-Seven-five's offer is the way to go.Smile


__________________________________________________
1995 K75 81,000 miles
K100 with Issues Usa-lo10
    

21Back to top Go down   K100 with Issues Empty Re: K100 with Issues Fri Jul 30, 2021 1:48 am

BadgerinNC

BadgerinNC
active member
active member
Looks like I will pass on the cheapo injectors. And order a rebuild kit from Mr. Injector and give them a cleaning myself.

    

22Back to top Go down   K100 with Issues Empty Injector cleaning Wed Aug 04, 2021 11:36 am

Kr4mo

Kr4mo
active member
active member
I have had great results with https://www.cruzinperformance.com/fuelinj.html
Their prices are very reasonable, $20 per injector and they replace o-rings, filter and pintle as needed.

    

23Back to top Go down   K100 with Issues Empty Re: K100 with Issues Sun Aug 15, 2021 11:05 pm

BadgerinNC

BadgerinNC
active member
active member
I ended up buying a set of chinese injectors. They are single hole instead of the four hole ones. Once I get running again I will let everyone know how they perform.
 I also bought a new Hall Effect sensor. I got that in and am working on the injectors. 
Is there a trick for getting the old ones out? I was trying to get the front one out and I slid the whole front end of the bike over. 
Any tips would be appreciated.

    

24Back to top Go down   K100 with Issues Empty Re: K100 with Issues Mon Aug 16, 2021 1:31 am

Laitch

Laitch
Life time member
Life time member
This thread describes some technique and options. Smile


__________________________________________________
1995 K75 81,000 miles
K100 with Issues Usa-lo10
    

25Back to top Go down   K100 with Issues Empty Re: K100 with Issues Mon Aug 16, 2021 8:23 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

26Back to top Go down   K100 with Issues Empty Re: K100 with Issues Tue Aug 17, 2021 12:43 am

BadgerinNC

BadgerinNC
active member
active member

That is perhaps a bit extreme.  Surprised
I think I will go the penetrating oil route.

    

27Back to top Go down   K100 with Issues Empty Re: K100 with Issues Tue Aug 17, 2021 11:21 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I'm pretty sure it won't work because your bike doesn't weigh as much as the car. I only posted it as an example of desperate measures.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

28Back to top Go down   K100 with Issues Empty Update Sun Aug 29, 2021 7:25 pm

BadgerinNC

BadgerinNC
active member
active member
I haven't had much time to spend on my K100 as of late. last weekend was back to Wisconsin for a graduation party for my youngest son, he got his PhD in Material Science and will soon be off to the National lab at Los Alamos to work on things far beyond my comprehension. 

I had cleaned every electrical connection I could find, installed the fuel filter and this weekend I installed a new Hall sensor and the cheap chinese fuel injectors and it fired right up. After sitting for a while it smoked like a diesel but I'm hoping that will work itself out after I get on the road and warmed up.

No telling if this will solve my issue until I get some miles on it, but I'm hopeful.

Thanks for everyone's input, I am sure I will have plenty more questions in the future.

After feeling pretty good about the bike starting I was swapping the bike and the lawn mower to the garage so I could get the Volvo in the shop for new brakes and I noticed the last injector was leaking fuel from the fuel rail. I'm going to try swapping the o rings from the old injectors and see if that works. They look in pretty good shape. 

Oh well, it's always something. Actually, it's usually two things so i shouldn't feel too bad about just one.



Last edited by BadgerinNC on Mon Aug 30, 2021 12:36 am; edited 1 time in total (Reason for editing : Update)

    

29Back to top Go down   K100 with Issues Empty Re: K100 with Issues Sun Sep 05, 2021 4:05 pm

BadgerinNC

BadgerinNC
active member
active member
I had the bike out for a long ride with three other guys from work yesterday. Ran pretty much flawless. No problem with getting the speedometer into three digits to keep up with the youngsters who think speed limit signs are suggestions.
The cheap injectors seem to work just fine. The problem was probably the Hall Effect sensor, but I may have just had a poor electrical connection somewhere.

    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum