R100GS carbs 1992 Big O rings on the Slides

[DrFarkoff]

I can understand that there will be the correct mixture but I am having some trouble getting my head around "Why"? Why keep the slide 5 mm raised my thinking is that its something to do with enrichening for altitude work? but surely CV carbs are self compensating

Bike is more "difficult" to start than ANY other Airhead I have EVER worked on and my feeling is to Junk these o rings and allow the slides to close properly?

Any thoughts on these

Always willing to learn and every day its good to learn something

 

[Dogbytes]

Try without and see what happens. (If it goes into meltdown, let us know so that we don't do the same!)

 

[Beemerboff]

Mine didn't have them when I bought the bike and it starts and runs OK .
Might fit them and see what difference it makes.
There are two passages which bypass the slide - spray carb cleaner down the large one on the right and it shroud exit freely round the needle - the small one on the left should exit from one of the pin pricks further down the intake, and both must be clear for proper performance.

 

[SJRoome]

Hi

Mine is a 1989 R100GS and it has never had O rings on the slides, nor are any shown in the manual. I have a vague memory that they were introduced to silence a problem some Bings had with the slides rattling on the body at tick-over. Yours are too big. It is essential that the slides can close fully, otherwise your mixture will be ridiculously rich at idle, you will have trouble starting, and poor performance at small throttle openings.

I am surprised Rob has not commented on this earlier - see his post www.ukgser.com/forums/showthread.ph...ever-running-rough-at-tick-over-and-low-revs?



Steve