frank bagley Posted January 13, 2013 Share Posted January 13, 2013 (edited) Hi there Back again with more questions Got the chance of a bored out Cub barrel but don't know which piston to use? The Barrel is 68mm from 63mm & I would like to avoid any issues with a change of stroke. Is there a straight replacement at 68mm? Thank's Frank Edited January 13, 2013 by frank bagley Quote Link to comment Share on other sites More sharing options...
woody Posted January 14, 2013 Share Posted January 14, 2013 Oversize C15? A C15 is 67mm standard bore, but not sure about pin size, piston height etc. relative to the Cub Triumph 500 and 650 pistons will fit the C15, so maybe the C15 will fit the Cub? Quote Link to comment Share on other sites More sharing options...
4jje Posted January 23, 2013 Share Posted January 23, 2013 Upb will give you the right piston. http://www.upbuk.co.uk/shop/engine/49-piston-kit-for-230cc-250cc.html Quote Link to comment Share on other sites More sharing options...
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