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Old 2 Weeks Ago
rossco63 rossco63 is offline
DBW Dweller
Join Date: Mar 2019
Posts: 2

Hi guys my son has 2002 rm85 at the moment it has a carby problem. Running a bit lean jetting problems. They say in the manual to use a keihin PE28 any help would be great. Thanks Rosso.
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Old 2 Weeks Ago
cluffie cluffie is online now
dbw Pro Legend
Join Date: Mar 2011
Location: melbourne
Posts: 1,424
It may have developed an air leak or the airscrew is possibly set out to far. The airscrew should be at 1.5 full turns out if your pilot is the correct size. It can be in the 1 to 2 full turns out depending on weather but it shouldn't be anymore then 2 turns out unless your pilot size is far to big. I'd try 1.25 turns out and see if your issue improves. Also the airscrew has an o ring and this may be worn or broken and air is getting sucked in. Screw the airscrew out and check the oring. Teflon tape can be used on the thread also if you suspect a leak.
Check hose clamp on reed block side is tight or the boot isn't cracked or leaking.
Air can also come from the reed block gasket leaking or even a crankshaft seal leaking also.
You can spray some wd around where you suspect a leak while it's running and see if the revs drop. If so,you've found a airleak.
Make sure your exhaust orings ain't leaking either as this effects running.

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