Picked up a 2011 DS90x and it's got an engine knock. But funny thing is that it doesn't do it in neutral. I checked the clutch and it looks normal, I tightened the chain, I topped off the oils, and put fresh higher octane fuel in. Starts right up, runs strong but only in forward it knocks and the faster you go the faster it knocks, when you let off the gas it dissipates. Any ideas what it might be before I tear the motor apart trying to find it lol??

 

We've got the information you seek on the ATV Connection homepage, here:

https://atvconnection.com/articles/a...ine-knock-101/

 

Ended up being a broken tooth on a gear, huge sigh of relief no motor work needs done!