samblade Posted June 29, 2015 Report Share Posted June 29, 2015 Hi, I have acquired an old 270 (pre pro model) but it won't pull the skin off a rice pudding! Probably due to the bad piston rattle it has. So I'm looking at a new piston kit but also have the possibility of a complete 280 top end from the later 2000-2002 model. My question is will the whole top end swap like for like? May be some re-jetting I presume. Also is the Keihn carb option a good idea on these? Quote Link to comment Share on other sites More sharing options...
tony27 Posted June 29, 2015 Report Share Posted June 29, 2015 If the top end is off the newer pro type motor then I very much doubt it will fit, needs to be the same generation Not 100% sure that there is a capacity difference between the 270 & 280 Quote Link to comment Share on other sites More sharing options...
samblade Posted June 29, 2015 Author Report Share Posted June 29, 2015 No the top I'm looking at is from a 2000 model not pro. Good point about the actual bore size, could of been a marketing thing but I'm pretty sure the 270 was a 256cc and the 280 was a 272cc, but thats just from memory? Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted June 29, 2015 Report Share Posted June 29, 2015 Pretty sure it will fit. According to partprogram the conrod is the same on the 250-280 models. So the difference is in the diameter of the piston/cylinder. Quote Link to comment Share on other sites More sharing options...
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