rock hopper Posted January 23, 2008 Report Share Posted January 23, 2008 Has anyone done this and does it make much of a change. I have heard that the bore walls get pretty thin? Thanks Quote Link to comment Share on other sites More sharing options...
29r Posted January 24, 2008 Report Share Posted January 24, 2008 Not sure but, I have one in the barn that is getting close to getting dragged out . Supposed 200 , was told that the pistons were unobtainium , but maybe rings . Some discussion would be helpful . Quote Link to comment Share on other sites More sharing options...
feetupfun Posted January 24, 2008 Report Share Posted January 24, 2008 It's not just a bigger piston job to get to 200cc. You need a bigger cylinder sleeve, head machined and also crankcases machined for the bigger sleeve. Various pistons are available. Some pistons require a spacer under the barrell. Some pistons need the gudgeon pin holes bushed down. It's a big job. Are you still keen to do it? Quote Link to comment Share on other sites More sharing options...
mattylad Posted January 24, 2008 Report Share Posted January 24, 2008 John Cane does an exchange version see his website Trailand trials UK Quote Link to comment Share on other sites More sharing options...
andy.t Posted January 24, 2008 Report Share Posted January 24, 2008 (edited) They are available HERE?,Idid think about it myself but not sure if it would knock out the mains,I think they could also be on the limit,like no more rebores,but not sure. Edited January 24, 2008 by Andy.T Quote Link to comment Share on other sites More sharing options...
swooshdave Posted January 24, 2008 Report Share Posted January 24, 2008 This page mentions a 200cc kit. Their website is a little sparse and I didn't see anything else about the 200cc kit, although a call or email would sort that out pretty quickly. Quote Link to comment Share on other sites More sharing options...
29r Posted January 25, 2008 Report Share Posted January 25, 2008 S'okay , you made me do it ! Roughly a 2.75"/70mm bore . Quote Link to comment Share on other sites More sharing options...
grouchof Posted January 28, 2008 Report Share Posted January 28, 2008 Hi, These kits are 68-69 mm bore. You can even go to 70mm with the original sleeve. Regards Quote Link to comment Share on other sites More sharing options...
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