idle problems with r65

[devo]

I've got an R65 that twice has started idling high (3k). I turned the idle screws down both times which seemed to cure the problem, but the bike still seems to take it's sweet time returing to 1100 after i have been running a while. Any ideas out there? Thanks as usual.

[bprigge]

Devo,

I would start with the simple stuff, like make sure your throttle linkage is actually returning to 'closed' at the carbs. Just reach down to the carbs and push the throttle plate arms down the next time it idles high. If they move down at all when you push on them you have a cable issue or a binding throttle plate shaft in the carburator. Do the same thing with the choke levers on the carbs. They should return to their stops when the choke is
off. My R75/6 choke levers on the carbs would not consistantly go to 'closed'
until I replaced the choke cables.

Also turn your handle bars from lock to lock with the engine at idle and listen for a change in rpm. If you get a change in rpm you have some sort of cable
or cable routing issue.

An air leak on the cylinder side of your carburators will also cause this. Start out by making sure the clamp screws are tight at the cylinder spigots and carbs and eyeball the condition and fit of the rubber carb to cylinder couplers.

A few other common ailments that will give you an irratic idle include the
timing advance mechanism sticking do to oxidation and hardened grease,
plus several carburator ailments including sticking slides and loose jets and
debris in the float bowls. I have been inside of MANY motorcycle carburators
and have found that 95% of the problems are caused by dirt and varnish
that remains when the fuel evaporates during bike storage. The other 5%
are caused by throttle slide diaphrams and incorrect assembly.

Oh yeah, and the fuel starvation problem caused by a plugged up tank vent like the previous fellow said. Bruce

[flash412]

An air leak on the cylinder side of your carburators will also cause this.Diagnose by spraying WD-40 all over the rubber intake manifolds (joints between rubber & carbs and rubber & heads) with the bike idling. If it speeds up, you've found the problem.

[devo]

Damn, you guys are good. I looked at the rubber connecting carbs and cylinder, it looks pretty bad. I'll try the wd40 thing, but It looks like a trip to Max's website is in order. Thanks for the tips.

[flash412]

Damn, you guys are good. I looked at the rubber connecting carbs and cylinder, it looks pretty bad. I'll try the wd40 thing, but It looks like a trip to Max's website is in order. Thanks for the tips.Screw BMW price$ and time on backorder. ou can buy a foot of generic radiator hose at your local cage bits place for a buck and half and cut an appropriate couple of inches with a razor blade. Install it with regular screw-type hose clamps. Take a carb with you so you get the right one. Do NOT buy hose that is too loose. You CANNOT get it tight with a hose clamp.

[Rev_Eddie]

Check the timing advance for sticking--it's done it on that bike a couple
times. IIRC, the intake rubbers were replaced in '98 or '99, so they should
be ok.

Rev. Eddie