iommajesty Posted November 26, 2011 Report Share Posted November 26, 2011 can anyone let me know what size a 320 bore should be Thanks Dave Quote Link to comment Share on other sites More sharing options...
woody Posted November 26, 2011 Report Share Posted November 26, 2011 standard 320 bore is 80mm Quote Link to comment Share on other sites More sharing options...
iommajesty Posted November 26, 2011 Author Report Share Posted November 26, 2011 standard 320 bore is 80mm Looks like i have been ripped off i have just got one that is 74mm Quote Link to comment Share on other sites More sharing options...
woody Posted November 26, 2011 Report Share Posted November 26, 2011 Standard 250 bore is 70mm and max oversize is 72mm, so not sure what that piston is from. All of the YZ, DT etc share the same bore/stroke as the TY so it isn't from one of those. Could be a jet ski or snowmobile piston? The 270cc Majesty kits that are on sale are 72mm pistons which is only the same as max oversize which actually gives 260cc, not 270cc. The 74mm piston will give about 275cc. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted November 26, 2011 Report Share Posted November 26, 2011 Wossner are making pistons 4 mm oversize for some patterns so that might be the source for a 74mm TY250 piston. Quote Link to comment Share on other sites More sharing options...
iommajesty Posted November 27, 2011 Author Report Share Posted November 27, 2011 Problem solved my digital vernier is faulty measured it with a mechanical one and it is 80mm thanks for the help Quote Link to comment Share on other sites More sharing options...
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