M1000 engine down

[KatMan]

I've got a 2007 1000. Lost the mag cylynder on the hill no compression.Pulled head, no apparent damage to piston or walls. Did stock sleds have weak rings? Do you need to pull engine to do top end? My egt was 1250 pulling wot for about 20 seconds. Thought those temps were ok. Any comments?

 

[moyiesledhead]

Gotta pull the cylinder off and have a good look. If there's no compression there's gotta be damage somewhere. Sounds like you may have gotten lucky with the cylinder though. I have mine set to run about 1050 - 1100 deg on a WOT pull, but I like to be on the conservative side. 1250 "should" be OK but how does the wash look on the top of your piston....and your plug colour?

It's tight on the 1000, but you "can" do a top end without pulling the motor, but I learned the expensive way to do crank seals at the same time. They have just as many miles on them as the pistons!

 

[KatMan]

Plug color looked and wash looked ok to me. Will get a second opinion.Leaning towards weisco pistons. Thoughts?

 

[wrenchyanker]

Check crank seals, won't build much compression if it got taken out.

 

[moyiesledhead]

Plug color looked and wash looked ok to me. Will get a second opinion.Leaning towards weisco pistons. Thoughts?

I'm not a fan of Wiseco's in a nikasil bore. I'd stick with Cat or get some SPI's.

 

[sledhead800]

stay with the stock pistons.

 

[KatMan]

will do thanks. got it apart, skirt/ring damaged under the wrist pin holes

 

[moyiesledhead]

That'll do it. Time to go huntin' for the pieces.