ASO-BANSHEE Posted July 18, 2011 Report Share Posted July 18, 2011 i want to change my pistons , because i want to change them does that mean i HAVE to bore my cylinders for bigger pistons can i just take off my cylinders, buy OEM pistons, hone my cylinders and install the new stock pistons ?? just curious Quote Link to comment Share on other sites More sharing options...
Zwiser Posted July 18, 2011 Report Share Posted July 18, 2011 Why stock pistons??? They are cast, which means they shatter if the piston to wall clearance is to great. So if you measure the clearances first and there good you should be fine. On the other hand forged pistons will also break but not in such small pieces so it probably wont hurt your crank bearings and itll be a easier clean up, if they do break. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted July 18, 2011 Report Share Posted July 18, 2011 Better Q is why do you want to change them. More info will help a lot, and get you a better answer. Quote Link to comment Share on other sites More sharing options...
Coupelx Posted July 18, 2011 Report Share Posted July 18, 2011 Better Q is why do you want to change them. More info will help a lot, and get you a better answer. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 18, 2011 Author Report Share Posted July 18, 2011 Why stock pistons??? They are cast, which means they shatter if the piston to wall clearance is to great. So if you measure the clearances first and there good you should be fine. On the other hand forged pistons will also break but not in such small pieces so it probably wont hurt your crank bearings and itll be a easier clean up, if they do break. so what is too great considering you need a little bit of room for the piston rings but one of my pistons broke at the bottom thats why im changing them too, i had low compression Quote Link to comment Share on other sites More sharing options...
Zwiser Posted July 18, 2011 Report Share Posted July 18, 2011 i think the specs are .002mm - .005mm measure the piston then measure the cylinder and subtract to get those numbers ^^ Quote Link to comment Share on other sites More sharing options...
Coupelx Posted July 18, 2011 Report Share Posted July 18, 2011 You should probably split that bitch open and have a look. that metal went somewhere. edit: also piston skirts breaking is a sign of too much piston to wall clearance. something that cast (oem stock) pistons are very picky about. it needs a bore job. now ill wait for all the leg humpers to come in here and say to run wiseco pistons because they dont break. Quote Link to comment Share on other sites More sharing options...
#1BADASSBANSHEE Posted July 18, 2011 Report Share Posted July 18, 2011 RUN WISECO THEY DONT BREAK. J/C I WOULD DEF BORE. THAT METAL HAD TO SCAR THE CYLINDER WALLS IT DOESNT TAKE MUCH. IT SHOULD NOT COST THAT MUCH TO BORE. $ 60-65 A SIDE. UNLESS YOU WANT TO DO IT TWICE. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted July 20, 2011 Report Share Posted July 20, 2011 easy on the yelling...we can hear you fine....haha. either way....like said above....you should bore them. or else they WILL break twice. the reason you had low compression was because you need a rebuild on your top end (more than likely) and also there is a damn good chance that your piston broke off its skirt because it was a worn out cylinder bore which caused to piston to have excessive play.....causing the break. Either way you should split that case (unless you find ALL pieces and can puzzle the piston skirt together to ensure that) basics....you WILL NEED to bore that cylinder out.... if you send it to our sponsors they will take care of you (usually for around $45 a side) and they can hook you up with all the parts such as pistons and gaskets that you will need. Quote Link to comment Share on other sites More sharing options...
Dicklez Posted July 20, 2011 Report Share Posted July 20, 2011 If your not sure what to do your best bet is to take the motor to a shop. They will mic the insides and see what you need for pistons if you have scoring. They will hone it up and get your ring end gap right. That way if it blows up you can blame them. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 20, 2011 Author Report Share Posted July 20, 2011 lmao nice @ the last reply thanks everyone for the reply and help i understand i have to bore my cylinders and i wasted money on new stock pistons #owell ill just sell them but im going to jus send my cylinders in for boring and honing thanks all Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 20, 2011 Author Report Share Posted July 20, 2011 i think the specs are .002mm - .005mm measure the piston then measure the cylinder and subtract to get those numbers ^^ ok thanks Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 20, 2011 Author Report Share Posted July 20, 2011 when i took these to a mechanic he said they were ok, are they bad ?? Quote Link to comment Share on other sites More sharing options...
donkeypuncher Posted July 20, 2011 Report Share Posted July 20, 2011 They may look Ok but that doesn't mean the piston to cylinder wall clearance isnt still too much. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 20, 2011 Author Report Share Posted July 20, 2011 They may look Ok but that doesn't mean the piston to cylinder wall clearance isnt still too much. you are right when i measured each cylinder one read 65mm and the other reads 64.9mm close to 65 thats too much for stock pistons correct ? Quote Link to comment Share on other sites More sharing options...
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