If you go to the skybolt hanger and clubhouse thread you will see my kit build great planes skyboltbuild with a rcg 20cc gas engine, having no problems so far with installing this engine as the kit build is known to need a bit nose weight, it should come in about 10.5 lbs with no lead required which is not a bad weight for a GP kit skybolt. A fair bit of cowl has to be removed but I like the agressive look it has ended up with.

I will stress this is the GP kit and not the ARF, the kit has a well engineered (balsa railway sleeper) front end that is very strong for a gas engine and even at that I glassed the firewall in to make sure the vibs did not loosen the front end over time. Im not sure what modelskybolt you have but there is a few about and each is different and may or may not like all that power and weight upfront.

Im going to presume ZOR running a 18 7 3 blade with his saito 125 is a typo, which is out of character for a usually articulate ZOR.