First of all, what kind of car did the guy at the hobby shop have? I know I used to have a Duratrax Max BX which had a TORQ .12 in it. I found out that the TORQ .16 piston/sleeve will fit it the .12 block, so I had a motor that was an illegal "ROAR" spec motor. Maybe that's what he meant by boring over. As far as getting it bored and honed to a bigger size and fitted with a matching piston, it's not yet available in R/C and would require a special tool to bore and hone the cylinder (sleeve) and another device to cast a new piston, which is unheard of right now in a motor that small.

Another thing you've GOT to realize...engine boring is meant to renew engine performance. When a cylinder wall is worn, egg-shaped, and scratched, it is meant to be be bored and honed along with a new piston and rings to restore engine performance. It IS NOT intended as a "hop-up".... boring the engine without the need to just wastes valuable cylinder life.

To give you an idea of how much cc's you gain...I had my Honda 110 three-wheeler recently bored .030 over because it is 22 years old and the cylinder wall was scratched and worn as well as a grooved piston and bad rings. The engine is only 105cc even though they call it a 110 and when I was done with the motor work (the new bore) I had a 108cc, still not even a true 110, gaining only 3 cc's. Now consider a .15 r/c engine. A .15 is the equivalent to 2.5 cc's. If I bored a 105cc engine 30 over and gained only 3cc's, how many do you think you would gain boring a 2.5cc motor 30 over. Nothing. Any noticable difference would make the cylinder wall so thin, it would crack before you could think about it...thus destoring a perfectly good sleeve.

One of my worst pet peeves is the way people think about the method of bore size. Lets say you have a 400cc engine (like on an ATV or something) Ok, ALOT of people think when you bore it .050 over... it means it makes it a 450cc. That is absolutely NOT true. Think about this incase you didn't know... .050 over is 50 THOUSANDTHS of an INCH over a standard bore size. There has been a lot of good cylinders screwed up and wasted misunderstanding this.

Sorry for the long post...I just HAD to explain this.