What causes this?

[paramuir]

OK so i took out my exhaust valve, cleaned it and put in a new bellows

Went for about 1.5 hours ride today...moderate...not hard...but not constant putting around either...here is a pick of what the bellows looked like on PTO side after my ride. Keep in mind this is brand new and had no oil on it

any thoughts? I jsut put a spring on the oil pump and i have FBF cable, the plugs were dark but seemed ot be egually dark and not wet when i pulled them out on the trail

 

[paramuir]

anyone?

 

[river]

did the bolts come loose under there and hit the bellows? or did you forget the put the spacer under the bellows ? things to check.