RE: been away from rc for awhile.. what should i do???
Not compression, but pinch is what makes the flywheel hard to turn over.
I've seen some very good (sponsored) truggy racers show up at the track with some engines identical to the Jammin( all Picco-based), and run like crazy with just way too much power. I mean, funny to watch, with tires ballooning, practically wheelies, etc... Then they figure out how to tame them down and make them driveable.. I.e., some people would say the Jammin is too much for a truggy. For a 21 it's brutal, so you won't be missing power.