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Speed dependent primary clunk on 2010 390

Joined May 2020
3 Posts | 0+
Issaquah, WA
Hi good folks, just purchased a 2010 390 and joined the forum. Thanks in advance for your help and wisdom. I discovered a concern when coasting down my hill today. To reproduce the issue and for troubleshooting purposes, I coasted with the engine off, clutch in, and in gear, I'm getting a clunking on rotation of primary drive. It's worse in 1st gear and gets progressively less apparent through taller gears. It does happen in neutral, but it's least apparent. The engine and transmission seem just fine, no problems running through the gears. Any ideas?
 
Just a guess take off clutch side cover have a look at any of the gears. Is timing chain adjusted? Look at the drive chain rollers.
 
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Agree on the chain. I had a chain lose a roller once and it sounded like the symptoms you describe. It wasn’t easy to spot either....*♂️
 
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