RCU Forums - View Single Post - does any one Lap their pistons and liners ??
Old 07-15-2017, 06:18 AM
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aspeed
 
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I only do it if I have to. I use Brasso or Silvo. Lately all the motors have been fitted very well. The older CS and some Russian ones I had needed to be done. Some of the ABC ones that have a very tight pinch, I will do if they lock up too much, rather than heating the cylinder as most people do. I just leave the rod on and go up down and a figure eight motion without going past TDC, for less than a minute, clean well, check the fit, and do it again if needed. I have an old NIB Supertiger G .15 right now that has no taper in the cylinder that will need a lap made up. Maybe some day. I bought a new Picco .12 OFNA that came with what I thought was just a perfect fit, and most OS stuff seems pretty close to being right when new. The nickel plating goes on very even compared to the chrome which needs honing at the factory. That is a hand operation and the results are up to the operator.