robinson373 Posted April 13, 2005 Report Share Posted April 13, 2005 I just did a compression check on my shee. 120 psi on shift side and 90 psi on kicker side. What would cause this. Just heard a new ticking noise in engine, did a ring break. Should my compression be more than 120 on the shifter side. I am at 420ft elevation. Quote Link to comment Share on other sites More sharing options...
kenr74 Posted April 13, 2005 Report Share Posted April 13, 2005 They should be within 10% of each other or it is time for a rebuild. 90psi is really low. Did you check it a few times? Quote Link to comment Share on other sites More sharing options...
sredish Posted April 13, 2005 Report Share Posted April 13, 2005 I just did a compression check on my shee. 120 psi on shift side and 90 psi on kicker side. What would cause this. Just heard a new ticking noise in engine, did a ring break. Should my compression be more than 120 on the shifter side. I am at 420ft elevation. 354698[/snapback] They shouldn't be any more than 5 psi apart, and neither should be below 95. You need to put new pistons in there. May or may not have to bore, dunno, a machinist will tell you, but you'll have to hone em anyway. You keep going with a difference like that and you'll be buying a new crank and possibly a cylinder if you screw up the one side. Buy a top end kit and put pistons in that beeotch. And get em ported while they''re off. Scott Quote Link to comment Share on other sites More sharing options...
robinson373 Posted April 13, 2005 Author Report Share Posted April 13, 2005 I was told by a builder in the area that if he were to port my cylinders, I would have to buy a new aftermarket head to bring the compression back up. Is there any truth in this? Quote Link to comment Share on other sites More sharing options...
racer Posted April 14, 2005 Report Share Posted April 14, 2005 I was told by a builder in the area that if he were to port my cylinders, I would have to buy a new aftermarket head to bring the compression back up. Is there any truth in this? 354782[/snapback] umm a little bit. porting can lower your comp due to the raised rooves. but i think a sotck milled head would do fine. Quote Link to comment Share on other sites More sharing options...
sredish Posted April 14, 2005 Report Share Posted April 14, 2005 umm a little bit. porting can lower your comp due to the raised rooves. but i think a sotck milled head would do fine. 354968[/snapback] Word. and the machinist that bores/hones your cylinders can do your head for maybe $35. Quote Link to comment Share on other sites More sharing options...
racer Posted April 14, 2005 Report Share Posted April 14, 2005 Word. and the machinist that bores/hones your cylinders can do your head for maybe $35. 355069[/snapback] they can be had on ebay for $10. Quote Link to comment Share on other sites More sharing options...
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