guy53 Posted November 2, 2016 Report Share Posted November 2, 2016 My 2003 Rev run realy well but it as a lot of compression and it's hard to kick. Is it a bad idea to lower the compression ? Guy Quote Link to comment Share on other sites More sharing options...
heffergm Posted November 2, 2016 Report Share Posted November 2, 2016 Sounds like the perfect reason for a low compression head. Quote Link to comment Share on other sites More sharing options...
shakennstirred Posted November 2, 2016 Report Share Posted November 2, 2016 (edited) How would you do it ? an extra head gasket on a watercooled bike is risky, one more place for a leak to start As said low compression head only real option Edited November 2, 2016 by shakennstirred Quote Link to comment Share on other sites More sharing options...
dan williams Posted November 2, 2016 Report Share Posted November 2, 2016 Beta sells thicker base gaskets as well. I have a lower compression head on my '13 300 and it does reduce the starting effort significantly but on the later bikes the compression chamber is a separate piece. I'm not sure this is the case on a 2003. . Quote Link to comment Share on other sites More sharing options...
guy53 Posted November 2, 2016 Author Report Share Posted November 2, 2016 A thicker base gasket would change the port timming. I would rather go for a thicker head gasket if avalable. Guy Quote Link to comment Share on other sites More sharing options...
billyt Posted November 3, 2016 Report Share Posted November 3, 2016 A 13 year old bike with high compression.. suspect.......... Mmmmm Has someone installed a new piston, rings, done a re-bore? If not then maybe eat some poutin mon ami. Seriously 1 Quote Link to comment Share on other sites More sharing options...
guy53 Posted November 3, 2016 Author Report Share Posted November 3, 2016 The more poutin I eat, the more difficult it will be to crank it in awkward situation ! ( seriously weight is not the issue, age maybe ) Guy Quote Link to comment Share on other sites More sharing options...
dadof2 Posted November 3, 2016 Report Share Posted November 3, 2016 I have tried both extra base and head gaskets on various bikes both to soften the power characteristics and ease starting. The effect on the power tends to be greater than the reduction in kicking effort. Bearing in mind you often have to start a trials bike in less than ideal positions, a change of bike may be the best option. Quote Link to comment Share on other sites More sharing options...
guy53 Posted November 5, 2016 Author Report Share Posted November 5, 2016 Thank you all,dadof2 you spared me lots of work for nothing. I will ''exercise'' my left leg over the winter. Guy Quote Link to comment Share on other sites More sharing options...
iconic558 Posted November 5, 2016 Report Share Posted November 5, 2016 Lots of compression = engine in good fettle. One way to easier kicking is to slowly ease her past top dead centre (piston at top of stroke) and then kick her over smartly. A lots of beefy adults struggle to kick a decent trials bike over....the short kickstarts dont help. My SWM has a decompressor which I wouldn't be without now, but modern bikes dont have this feature. Quote Link to comment Share on other sites More sharing options...
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