2wheelturned4 Posted December 24, 2012 Report Share Posted December 24, 2012 Hey guys, just after some advice. I need some replacement pistons for my 392 banshee, old pistons are 67.95mm and i am under the impression the bore size is 68mm as it is a 392cc kit from athena. I would like to get some quality pistons as it seems running a little rich has caused the standard athena pistons to break off the intake ports. The bike will be going in for a tune with a guy who knows banshees so it should get dialled on properly, fingers crossed no more broken skirts! I have come across vitos 68mm pistons and wsm forged 68mm pistons, now they would be to big for my bore correct? Would wiseco do a forged piston of 67.95? Any ideas where else to look? Cheers for the help Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted December 24, 2012 Report Share Posted December 24, 2012 67.95 is the measurement at the crown of the piston. But its a 68. Vitos makes a nice 68mm piston with 3 different wrist pin heights. One for stock stroke, 4mm 110 rod, and 115 rod. Quote Link to comment Share on other sites More sharing options...
camatv Posted December 25, 2012 Report Share Posted December 25, 2012 you need to check piston to wall clearance. intake explosions on the piston indicate piston rock. from to much piston wall clearance. Quote Link to comment Share on other sites More sharing options...
2wheelturned4 Posted December 25, 2012 Author Report Share Posted December 25, 2012 so would it be safest to take it into a machine shop and have it checked? they were the pistons sent with the kit and just assumed they would be correct Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted December 26, 2012 Report Share Posted December 26, 2012 the forged pistons athena provides with the kit are garbage. for one are cast not forged, two they short circuit the motor because of the triple ports and the cut aways on the sides of the piston. and yes the bore should be mic'd for proper clearance as well. Quote Link to comment Share on other sites More sharing options...
2wheelturned4 Posted December 27, 2012 Author Report Share Posted December 27, 2012 righto cheers for the help Quote Link to comment Share on other sites More sharing options...
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