ORIGINAL: rcflyboy01

I have been running 20% caster and 80% synthetic oil in my Saitos engines. I have a buildup of carbon in my muffles and manifolds. The carbon is causing my engines to run hot and leans out on me. Outside of buying a new muffle, I need some ideas on how to clean out the back carbon?

ORIGINAL: treehanger

This was the way I got it used. I had never did run it before these pictures. Yes, I did crockpot it! Still took a lot of work to remove what was left.
Yesterday I used 17% oil w/ caster/syn mix. 10% nitro to test it out. Maybe I should use 15%.
Bob