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    Are 800 XCR motors known for eating pistons?

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    • Member since
      December, 2008
    Are 800 XCR motors known for eating pistons?
    Posted by cool storm on Tuesday, February 03, 2015 6:22 PM

    After a long road with diagnosing my cousin's sled having a cylinder not firing, we finally pulled the pipes and looked at the piston.  To our suprise everything south of the ring lands was gone. almost not skirt left what so ever. This is a stock cylinder sled with stock pistons. Being a nice guy I donated my top end off of my xcr motor waiting for the race chassis to be built. The use of mine required swaping all three because they are ported. I thought I could use the pistons and found that two of the three pistons on my motor are cracked in the same manner. My question is if there were bad pistons that found there way into some xcrs or what cause this seem too much of a coinsidence.

    • Member since
      July, 2005
    • From: Upstate New York
    Posted by White Lightning on Wednesday, February 11, 2015 12:24 PM

    Heres my perspective - if this XCR is a high mileages sled and has never been taken apart .. what happens is over time .. the skirt gets wear and tear and eventually it will start making a rocking motion between the piston and the cylinder. Usually when a skirt breaks off, while running - it will take the crank out. If your pistons is cracked .. do not reuse those pistons. Replace them all and make sure they are all within specs - check crank to make sure everything is ok there. If it was me .. I would replaced the waterpump bearings, replace the crank seals with a refresh the top end - WL.

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