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Polaris: EDGE 2002-2005, all models in the Edge chassis
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Old 03-22-2018, 10:38 PM
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Question Is this a problem??? VES Exhaust Valve Piston Rub

While I had the head off to replace the suspected blown head gasket I noticed that it appears the exhaust valves may have rubbed on the pistons.

Also do the marks on the cylinder walls look normal for an 04 Liberty 800 engine?





There was a lot of water in the gas tank and it took out one of the reeds and damaged several others.

Last edited by The Grand Pooh-Bah; 03-22-2018 at 11:01 PM.
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Old 03-24-2018, 09:29 PM
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Cylinder marks are normal. As long as u can’t catch your finger nail on them they’re fine. Piston wash looks really good too.

There was a post awhile back in the iq section I believe were valve/piston rub was a issue. I had suggested doubling up the valve gasket to get more clearance but apparently that wouldn’t work as someone chimed in and said there’s a stop on the cylinder it’s self that gets worn down causing this problem. If that’s the case then only replacing the cylinders would solve this problem. I think u could file the edges down a tad and fix this problem. Worth a try.

Deffinitly take a look through the exhaust and see how scraped the piston might be. A little scratching ain’t nothing to worry bout. If that’s the case then good find!
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Old 03-24-2018, 09:43 PM
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Pull the y-pipe look at the side of the pistons and rings. Make sure the valves didn't chip a ring.
Pull out the valves and file them a bit or take them to the bench grinder. Make some clearance.

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Old 04-01-2018, 06:03 PM
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The stop on the VES guillotine valve itself is probably pretty beat up. It certainly looks like an expensive accident waiting to happen. As in piston/ring/cylinder replacement. Some used valves can be bought cheaply on EBAY, since Edges aren't IN anymore. Hand honing of the cylinder wall catches oil to keep the ring contact surface lubricated. Honing marks wear away and need to be replaced.
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