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after warming up, my honda 09 foreman makes a rattling noise at a certain rpm in each gear. at 5mph in 1st gear, at 9 mph in 2nd, at 13mph in 3rd, and 18 in 4th. 1 mph faster or slower and its gone. but it's driving me crazy. will also do it in neutral as you increase the throttle and pass thru that specific rpm. honda mechanic thought it was in the frame - retorqued motor mount, removed and replaced fenders, heatshield, etc. i think its internal as it only does it after warming up. only 180 miles and done it since day 1. help!
 

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Sounds like a wrist pin to me... or it may be the muffler internals are loose.
 

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I heard a polaris do something similar to this once at the bike shop and it was the clutch. Not saying this is the problem just an Idea. It was a Polaris TrailBlazer if I remember correctly.
 

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I had a rattle in my machine at a certain rpm found it to be the heat shield on the header pipe. I had to remove the bolts on put lock washers behind the shield and that cured the problem.
 

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I bought my 08 rancher about 2 months ago brand new. I had some rattling or chattering in the rear end when I would shift from 4th to 5th. The more I would accelerate it would go away. I think it had to do with the breaking in process. I dont hear it anymore. I'm on my third tank of gas and when thats gone, I will need to take it in for its first service
 

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Sounds like it’s the heat shield or muffler like said above or it could be an exhaust leak. Like where something is bolted up together and is just loose. My accord dose the same thing on start up and when you rev it sometimes it goes away but most of the time it gets a little louder until the sound of my exhaust drowns it out. Check where everything bolts on or to the exhaust. Tighten everything and see if that doesn’t help out any.

That would suck if it's a wrist pin...
 
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