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07 Arctic Cat 250 Transmission Knock


Sha35297

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Customer brought in this bike for no response when put in gear. After getting into the transmission I found the main shaft for the clutch had been stripped where the gears mesh up and also the shaft for the gears had been broken in half. I replaced all broken parts and reassembled the transmission. Now it makes a knocking noise in low gear and in reverse. When in neutral it tries to roll reverse while making the same knocking noise. I’ve disassembled and reassembled it several times with the same result. Any ideas??

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I see in that last photo, of the broken shaft with gears, that the old bigger gear has beveled sides to the cog, and the new one doesn't. I don't suppose that could make a difference, maybe the bevel, or just that it's different, wider perhaps.

And you say that in neutral, it's trying to creep backwards? while making a knock.. that sounds like maybe the sliding engagement dog/lugs could be rubbing together when they aren't meant to. The fact it's making a knock in low and reverse might be that the sliding dog that engages them is in backwards or not right for the new cogs/shaft or that there's some end float that needs adjusting.. They have quite a few endfloat adjustments and shims by the look of the canam manual I have.

The fact it doesn't do it when you turn it slowly might be because the angle cut gears aren't trying to wind sideways at that rev/load.

I'd be looking for signs of rubbing on those new gears someplace there shouldn't be, or that seems like too much rubbing been going on for such new parts.

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  • 2 weeks later...

Hello, Just wanted to give an update.  I found a couple broken teeth on one of the gears. Ordered a new one, had the correct part number, but was the wrong part. Found a used one on Ebay. Got it in over the weekend and installed it this morning. No more knocking sound.  Simple fix I guess.

Thanks for the help.

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