Hi all!

Problem i'm having is that the bike is racing (as if running out of petrol) at idle when in neutral or clutch is in. When it's in gear at low revs it's jerky and after a few minutes will cut out. and is difficult to start (5+ kicks).

I have tried:

* Clean air filter

* Cleaned carb/jets and checked throttle cable all fine, slider snaps shut

* Changed fuel for fresh mix

* Checked piston/rings through exhaust port seems to be clean and no scoring (usual carbon dep)

* Fan goes on and off as normal

* Tried changing the mix and idle (mix doesn't effect the problem, idle slows engine racing but stalls easily when riding and still races when clutch in. :-s)

* Checked rubber boots for air leaks

I'm begining to wonder if this is going to be a big fix... Any ideas?

Cheers

J

Is it useing gearbox oil ????

If so could be a crank seal on the way out....

Check under the flywheel for any oil comming though the seal....

Give the bike a good blast and smell tail pipe for a burnt gearbox oil smell.

Cheak petrol tank is venting....

Clean carb again and make sure pilot jet is spotless.

Sounds like you have an air leak?

Air is being sucked into the engine in front of the carb making engine lean,hence the reving up likes its running out of fuel.

Possible causes are reed block,generator side crank seal as mentioned is post above,if it was sucking in gear box oil i think it would go rich and not rev out plus you may get excess smoke from exhaust??

Hope this helps?

Benz

Thanks guys. I replace seals and let you know if it's solved...

Update...

I've removed the head and the barrel and the barrel gasket has oil on both sides on the short front section...

Is it possible that it's sucking in here which is causing lean running? I really don't want to split the engine to do the crank seals.