Deets Posted February 4, 2020 Report Share Posted February 4, 2020 Finally got around to checking squish and compression. Now that I’ve got my bike tore apart. Right side 130. Left side 140. So I checked squish, Right side .0675 Left side .060 .0075 seems like a lot to be off side to side, is that common with a stock head? Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 That was with a stubby plug adapter, schrader valve was leaking on the long adapter. I’ll fix it and try again, but it’s still definitely 10 psi different from side to side. Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 Head is within .0005 most places, couple at .001 but that was most likely my inability. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 I’m thinking it’s most likely the pistons. I’m unsure what pistons were used, but it’s 65mm bore on oem jugs Quote Link to comment Share on other sites More sharing options...
ride.race.live Posted February 4, 2020 Report Share Posted February 4, 2020 your squish is way out of whack... .060 is wayyy to big for a stock motor to begin with. 1st off you need to make sure you got the right base gasket. and pistons at that... once you narrow down your squish issue... then do a compression test... because a that much variance in squish can effect compression. Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 wonder if a thicker gasket was used to try and keep comp down? 130-140 is all I really want anyway for a trail bike. But the variance bothers me Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 What are base and head gasket thicknesses for a stock engine? Quote Link to comment Share on other sites More sharing options...
gusto Posted February 4, 2020 Report Share Posted February 4, 2020 re-measure your squish. Also, with the stealth head option from Driveline (sending in your core) its hard not to go that route and have custom domes cut or the ability to change out domes/squish/compression. Quote Link to comment Share on other sites More sharing options...
Deets Posted February 4, 2020 Author Report Share Posted February 4, 2020 21 minutes ago, gusto said: re-measure your squish. I did just that when I got home. Solder I originally had was .118 thick. I know it was too thick. I tried to twist up some smaller stuff yesterday and was roughly .055. It never touched the .055 solder. So I figured I was close anyway with the bigger stuff. Today I twisted some together to get .080. So I put 2 pieces in each cylinder held in place with a dab of grease. Both cylinders measured at .057 this time. I must have been a touch shy of the cylinder wall yesterday goin through the plug hole. Feel better knowing squish is the same. Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Here’s the pistons, anyway to tell brand? Has 150 stamped on the domesSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Deets Posted February 5, 2020 Author Report Share Posted February 5, 2020 Guy used only Klotz, not sure which one. But I really don’t like what I seeSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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