carb cleaner goes

[nhlkats]

can i disconnect the tube coming from the airbox to the carb, turn the bike on, let it idle, and gently mist carb cleaner into the carb from the now exposed air intake side?

http://images.nasioc.com/forums/images/smilies/confused.gif

someone suggested this may help for my recent condition of: non-consistant "missing" for a split second while full acceleration in 2nd gear sometimes 3rd. doesnt miss when accel slowly or when steady speed, only sometimes misses for brief moments when WOT. like i said, its not consistant, yesterday it was doing it, today no, the day before yesterday yes.

[flash412]

can i disconnect the tube coming from the airbox to the carb, turn the bike on, let it idle, and gently mist carb cleaner into the carb from the now exposed air intake side?Sure. But it probably will have no effect on your problem.

You need to take the carbs off, take them apart, spray some cleaner through the various orifi, replace o-rings as needed and reassemble in reverse order.

Or, if you PayPal me US$100, I will do my "Carb Dance" to fix them. (Results not guaranteed. No refunds.)

Oh WAIT... if you have stock spark plug caps REPLACE THEM with NGKs. That usually fixes problems like yours. If that doesn't work, THEN send me the $100.

[nhlkats]

argh thats what i thought too, no good unless a thorough take-apart and clean job is done.

things to do today:
1) dishes
2) laundry
3) send dusty butt 100 bux
4) take over world

[20774]

Do it anyway...it takes so little time and could help. If not, then move on to the harder or more costly things. You could also spray water into the carb throat... I've heard this will help "steam clean" the combustion chamber of minor carbon build up. Pros and cons with that, but something like that helped my older car when I developed a knock years ago when a piece of carbon broke off and the piston was slamming it back into the top of the combustion chamber. At the time, the dealer used power steering fluid but the concept is the same...it got me back on the road. That's been about 100,000 miles ago...

Kurt in S.A.

[James.A]

argh thats what i thought too, no good unless a thorough take-apart and clean job is done.

things to do today:
1) dishes
2) laundry
3) send dusty butt 100 bux
4) take over world

Send Bing Agency $10 for the carb book and have at it. It is un-believably easy if you have the exploded view/parts list page in front of you. I suggest you call Re-psycle or Max BMW to buy your parts. You can talk to a BMW parts guy and get everything you need all at once. While your'e at it, get new floats and needles. Consider skipping the o-rings on the throttle shafts. Extremely difficult to re-assemble correctly, and arguably the least likely thing to give you trouble. I did mine on one of the 750's and the difference is profound.

[The_Veg]

I'll that you should only disassemble one carb at a time if you've never done it before- that way you can use the other as a reference if you get lost. But they're pretty simple really.

ALso some of those little passages can be tricky to get clean. Try a piece of fishing line or some very fine copper wire to chase out the yummies.
Then use the same bit of line or wire to make sure your jets are unobstructed, and that includes all those little cross-drilled holes in them too.

[RandyB]

I just rebuilt mine as part of a larger maintenance effort. I had access to an ultrasonic cleaner and put both in there for a couple of days. Literally. Then I disassembled, cleaned everything and renewed all o rings. Piece of cake. The throttle shaft was easier than anticipated. There was a lot of build up in there, so it was worth the effort. The o rings and gaskets of the enricheners were in really bad shape. A little threadlocker on those screws helps.

I also replaced the dome screws with the hex head version. Heavy on the anti-sieze.

Add in the silicone gaskets for the bowls and you've got it whipped.

[kbasa]

Be sure to get the enrichener disc back on in the proper orientation.

[JohnP]

I just rebuilt mine as part of a larger maintenance effort. I had access to an ultrasonic cleaner and put both in there for a couple of days. Literally. Then I disassembled, cleaned everything and renewed all o rings. Piece of cake. The throttle shaft was easier than anticipated. There was a lot of build up in there, so it was worth the effort. The o rings and gaskets of the enricheners were in really bad shape. A little threadlocker on those screws helps.

I also replaced the dome screws with the hex head version. Heavy on the anti-sieze.

Add in the silicone gaskets for the bowls and you've got it whipped.


RandyB -- How long since since your last rebuild?

[RandyB]

Prior to my rebuild, I have no idea. I rebuilt about 6 weeks ago and it's been great. rkildu helped me level and balance them and it's made a world of difference.