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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.

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Old 03-09-2009, 01:58 PM
PBWR450 PBWR450 is offline
Join Date: Nov 2008
Location: Missouri
Posts: 31
Default Unidentified engine/gearbox noise

I finally had a chance this weekend to air out the 01 EC250 I bought last fall. Recent maintenance includes a cylinder replate to A specs with a Vertex piston, bottom con rod side to side clearance was within spec and there appeared to be no up/down play. Clutch has recently started to rattle some at idle, possibly dampers because it goes away when clutch lever pulled in.

Anyway, while at a poker run this weekend part of the course was a good clear uphill section. While climbing this section in 4th gear about 1/2 throttle I began to hear a squeling almost grinding type noise that appeared to be coming from the right side. It immediately went away after dropping the revs. I ran the section again in 3rd gear at the same RPM range and did not hear any noise. I then tried it again in 4th and the noise came back at about the same RPM range as before. Anyone have a clue what may be causing this?
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