16 years of testing with Zenoah conversions shows NO increase in rpm..If the spark is in the right place with the mag a conversion won't change anything except the weight...Running glow fuel shows 600 more rpm and much less weight..A glow converted G23 weighs 2 lbs, rpm is 8000 with a Mejzlik 18-6........
Yes, glow fuel at $15 and gas at $2 is a big reason to run a gasser...