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2006 Arctic Cat DVX400 Blown engine?


toomanytoys
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Dream Car Giveaway

There are no rocker arms, the cams sit directly above the valves, there is a bucket tappet with a shim underneath for valve adjustment. Take off the valve cover first and the valve train, you could have some tight or stuck valves being held partially open, there could be a problem with your compression release system. Start there before removing the head. You should be able to get to the top of the motor by removing the gas tank.

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There are no rocker arms, the cams sit directly above the valves, there is a bucket tappet with a shim underneath for valve adjustment. Take off the valve cover first and the valve train, you could have some tight or stuck valves being held partially open, there could be a problem with your compression release system. Start there before removing the head. You should be able to get to the top of the motor by removing the gas tank.

Thats good stuff. I know there arent any rocker arms, I was just trying to describe what the motor sounded like. Sorry for the confusion.

I am leaning toward a broken timing chain myself. I cranked the bike and put my hand over the muffler and instead of feeling compression pulses I got suction. That would mean the exhaust valve is open right? What about the compression release you mentioned? Could that do it?

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You said it was turning over real easy,check your compression,it sound like it could have jumped time,if you dont have a compession gage hold your thum tight over plug hole ,get someone to turn engine over .The compression should blow your thum off the hole if not your compression is to low.

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Well I finally got around tolooking at it and this is what I found: The exhaust cam retainer came loose (hence the noisy valvetrain) and tore up the cam and cylinder head. So the top end is shot. Im done with this p.o.s.

It is now up for sale for parts. With the exception of the engine everything else is in pretty good shape and it has a aftermarket exhaust.

Im taking offers.......

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  • 1 month later...

Well it went boom again. After riding for about an hour the motor started to sound like a sewing machine so I turned around and headed back. About a mile later I heard a loud ping sound and the motor locked up. After I got it home I took a look and this is what I found : the timing chain isnt broken and I can only turn the motor about 3/4 turn by hand before it locks up (forward or backward). The spark plug is crushed so I guess the piston hit it. The crank isnt broken either. Did I stretch the rod? The piston does move up and down when I turn the motor it just locks at tdc.

Ideas? Opinions?

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Wrong spark plug maybe, could be sticking out too far. Where did you get the head, it could have been shaved, if it was taken too far down, you would lose the necessary clearance needed for the piston to travel up without interference. It would also raise the compression, possibly to a level that would require race fuel or a mix of pump gas and race fuel. I would definately take the head off and take a look, if the piston hit the plug, it is likely that the piston is damaged. Sorry to hear about your bad luck. Let us know what you find.

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