farmergunner Posted May 30, 2014 Report Share Posted May 30, 2014 I did a compression test on a banshee I just picked up and it was reading 30 so I took the jugs off and found the rings were broke. The cylinders look good inside and are smooth. I mixed the cylinder and they are still with stock perimeters so I ordered stock 64 mm pistons and rings. My question is do I need to hone the cylinders before installing the new pistons or can I go ahead and install. I have never had to hone a stock bike before but I see a lot of people on here saying they did it when they replaced the pistons. Thanks jamie Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted May 30, 2014 Report Share Posted May 30, 2014 Yes. Any time new shit goes in. There was a ring in pieces? So there may even be enough damage to need a bore. The pistons are already bought? I sure hope the bores aren't all egg shape and scarred up. Quote Link to comment Share on other sites More sharing options...
farmergunner Posted May 30, 2014 Author Report Share Posted May 30, 2014 Yes one of the rings was in three pieces but still in its slot. There is no visible scarring on the bore and when I mic'd the cylinder it was all within stock spec still Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted May 30, 2014 Report Share Posted May 30, 2014 Did you take 6 measurements to make sure it's not an egg? Quote Link to comment Share on other sites More sharing options...
Banman1122 Posted May 30, 2014 Report Share Posted May 30, 2014 You need to check them with a micrometer and a telescoping gage to check the bore an inch down and in 6 places. Top mid and bottom front to back and left to right. A caliper only can check the top and bottom the middle is very important to check as well. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Banman1122 Posted May 30, 2014 Report Share Posted May 30, 2014 Also a light hone is good so the new rings can seat properly. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
farmergunner Posted May 31, 2014 Author Report Share Posted May 31, 2014 Thanks guys for the info. I borrowed a telescoping gage and I do have an egg. Had to get them Bored and ordered new pistons . Another week on this long build Project Quote Link to comment Share on other sites More sharing options...
lil Doobie420 Posted May 31, 2014 Report Share Posted May 31, 2014 Damn that sux. Atleast u didn't get too far with it. Quote Link to comment Share on other sites More sharing options...
Banman1122 Posted June 2, 2014 Report Share Posted June 2, 2014 Good deal. You can return the pistons you did get. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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