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]


tjh1985

tjh1985
Silver member
Silver member
Needing some insight...I accelrated off a stop light rather quickly (engine reving high) as i shifted from 2nd to 3rd gear suddenly my ‘85 K100 loss noticable power, the muffler became louder abd sputtering and as i nursed the bike home on the highway there was way more vibration coming up through the handlebars. I replaced the sparkplugs and a fuse i found burnt out, but the bike still lacks power (never stalls while ideling though), the noise is still more of a sputtering sound and the vibration continues, especialy in 4th or 5th gear.

Do any of these symptoms sound familiar to anyone here.

Grateful for any help,

Thomas

http://www.thomashurst.com
    

duck

duck
Life time member
Life time member
#1 - Fuel filter - NAPA 3032


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

tjh1985

tjh1985
Silver member
Silver member
Awesome! Going to change the fuel filter then!

http://www.thomashurst.com
    

Stumpy

Stumpy
Silver member
Silver member
Check the condition of the fuel pipes, if one is collapsing or not connected properly.


__________________________________________________
BMW K100RT 0095857
    

MartinW

MartinW
Life time member
Life time member
What is the condition off the spark plugs?? Are they the same, are they wet or dry??
Regards Martin.


__________________________________________________
K75s Hybrid
    

tjh1985

tjh1985
Silver member
Silver member
Update...kinda

I was out driving the bike around the neighborhood trying to burn off the remaining gas before changing the fuel filter and after a few backfires (while low on fuel) the bike suddenly gained its missing power back, no vibration, and the bike no longer sounded like a Harley chopper bike...I haven’t changed the fuel filter yet and still plan too, but does all this still sound like the fuel filter?

http://www.thomashurst.com
    

tjh1985

tjh1985
Silver member
Silver member
Stumpy I will check those also

http://www.thomashurst.com
    

tjh1985

tjh1985
Silver member
Silver member
MartinW - I replaced those, but when I pulled them they were black and looked like they hadn’t been changed in a while. One thing I did notice was the plugs I pulled had more of a round bulbous end and the plugs that came up for K100’s at the auto parts store are very straight and narrow. They seem to work, but I don’t have enough experience to know if this is normal or is/will be an issue...feedback?

http://www.thomashurst.com
    

MartinW

MartinW
Life time member
Life time member
Plugs definitely needed changing. Problem might have been a dirty injector or injectors. Run a couple of bottles of Techron through the bike 1/2 bottle per tank.
Regards Martin.


__________________________________________________
K75s Hybrid
    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
@tjh1985 wrote:MartinW - I replaced those, but when I pulled them they were black and looked like they hadn’t been changed in a while. One thing I did notice was the plugs I pulled had more of a round bulbous end and the plugs that came up for K100’s at the auto parts store are very straight and narrow. They seem to work, but I don’t have enough experience to know if this is normal or is/will be an issue...feedback?
You may have take off Bosch plugs which have the round end OR you may have take off NGK plug which have a screwed on round end and put in NGK plugs which come without the round end. The narrow straight top you will see is threaded and you need a screw on bobbin with that round shape. If possible get it off the old NGK plugs if you had them. The Bosch one is not removable. You can get those bobbins but maybe someone will have some to send you? Don't run without them because you will cause arcing inside the plug caps and destroy them before long.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 96,650 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell
    

tjh1985

tjh1985
Silver member
Silver member
92KK - they were Bosch plugs so I’ll go buy those instead. Thanks for the wisdom on this. Damn I love this Forum

http://www.thomashurst.com
    

tjh1985

tjh1985
Silver member
Silver member
UPDATE

1. Fuel Filter replaced ✅
2. Correct spark plugs ✅
3. 1/2 a bottle of Techron added ✅
4. No collapsed fuel line ✅
5. Back on the Road ✅✅✅✅✅✅

Thank you to;
Duck
MartinW
92KK
Stumpy

Didn’t all myself and it cost about $25. This forum never ceases to amaze me!

http://www.thomashurst.com
    

13Back to top Go down   Help Needed: Power loss, vibration, sputtering Empty Power prob on Sat Jul 27, 2019 8:26 pm

daveyson

daveyson
Silver member
Silver member
Maybe look closer where fuse blew also,  to find maybe why.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
    

tjh1985

tjh1985
Silver member
Silver member
Oh yeah, there was a fuse blown and I replaced that as well

http://www.thomashurst.com
    

duck

duck
Life time member
Life time member
Just curious but did you try blowing through the old fuel filter to see if it was clogged?

The fuel filter is probably the easiest and cheapest maintenance item that is often overlooked on the old Ks. (Maybe because car ones seem to last much longer.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

tjh1985

tjh1985
Silver member
Silver member
I did not try to blow through it, but I saved it and will try that. Not sure how old the filter is but it’s an original BMW fuel filter and I’m pretty sure the previous owner I bought it from did NOT get an original BMW fuel filter installed so my guess is it’s been in there a while.

http://www.thomashurst.com
    

tjh1985

tjh1985
Silver member
Silver member
@duck - I blew through the fuel filter I replaced. I had to blow pretty hard to feel air through the other side. I’m not sure if that’s what to be expected or not...thoughts?

http://www.thomashurst.com
    

Laitch

Laitch
Life time member
Life time member
@tjh1985 wrote:thoughts?
I think it would be interesting to determine how many psi—or bars—you can produce by blowing through a tube with the inside diameter of a fuel hose.  Is your gauge handy?  Smile


__________________________________________________
1995 K75T 73,000 miles
Help Needed: Power loss, vibration, sputtering Usa-lo10
    

tjh1985

tjh1985
Silver member
Silver member
No gauge...

http://www.thomashurst.com
    

Poupy

Poupy
active member
active member
Sawing in two lengthwise a used filter reveals a very blacky paper accordeon.
You then realise that blowing in such a filter hoping its cleaning is a waste of energy Smile

    

duck

duck
Life time member
Life time member
@Poupy wrote:Sawing in two lengthwise a used filter reveals a very blacky paper accordeon.
You then realise that blowing in such a filter hoping its cleaning is a waste of energy Smile

The purpose of blowing through a used fuel filter is just to see how much it might be restricting flow, not to clean it.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

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