vmaxup Posted February 7, 2004 Report Posted February 7, 2004 You all getting your panties in an uproar. I find allot of you dont read the message very clear. He said he milled the head 90. He probabby redid the squish its not hard if you have a lathe. I have a tool I made that you thread into the plug hole and spinn it on a lathe. Then you recut the squish into the head which in turn raises your compression. Quote
boonman Posted February 9, 2004 Report Posted February 9, 2004 Then you recut the squish into the head which in turn raises your compression. This would lower compression. But, with shaving the head, and then re-cutting squish, you can get it perfect. Don't forget to overlook the fact that you said probably. You can't be using probably with anything when it comes to a motor. You have to KNOW what is up. by someone saying that they shaved the head .090" or whatever, you can't assume anything. You need to be sure...... I assume he had the chamber re-cut. Because there ain't no way that the motor is running with that much shaved off and no re-chambering......... Quote
bansheecaptain Posted February 9, 2004 Author Report Posted February 9, 2004 well i got it shaved to .030 and it looks right . by the looks of it if i would of taken more off then for sure you would have to check the squash and all the other stuff . so .030 is the way to go . thank you boonman and banshee04le for the info it helped alot . Quote
yamaha350 Posted February 12, 2004 Report Posted February 12, 2004 i ran the .090 head without rechambering. no double base gasket and a yamaha head gasket. it gave me 140 lbs of compression. it was all i had other than a stock head so i ran it. then switched to a prodesign cool head with 18cc domes and had 150 lbs. switched to 17cc domes and had 155. Quote
MRMOONEY Posted February 12, 2004 Report Posted February 12, 2004 I RAN A COOLHEAD WITH 16CC DOMES AND HAD 195, LBS, MY NEW MOTOR HAS 24CC DOMES AND HAS 180LBS, GOING TO 18CC TO RAISE IT UP TO AROUND 220 OR SO Quote
boonman Posted February 12, 2004 Report Posted February 12, 2004 This is nutty. I flat out REFUSE to believe that you ran a factory yamaha head machined .090" of the gasket surface, and ran it with no problems. It just simply is not possible. And CC'ing a head, doesn't really tell you a whole helluvalot about how much compression you will get. It's all about the squish and how it ws designed. If you were/are runnign a 24cc dome and at 180, I am thinking it is a custom cut chamber and not an off the shelf item. Quote
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