I'm running 20% trinity MH. Hmmm thats interesting needing to remove a shim cause it set for 25-30%. rccheech would know he runs alot of RB's. I cant imagine that its shimmed wrong cause its running so nicely. However I'm probally at a lil more than a 1/3 of gallon through her. Have been thinking about a 5-7 port Go. However after this I may need to rethink that Idea and go with another RB if aint broke don't fix it. I still need to get a track buggy my XTM not gonna cut it. I'm waiting to get a LOSI one step at a time for me. I figure by the time I get this engine broke in I should have a Losi to drop it into. What buggy you running?