Converted my revo to a big block. Had an os .21vg on it and it ran and shifted fine. Put a os .30vg on it and now it doesn't want to shift. Made sure clutch was tight and turned tranny shifting point all the way to left, still doesn't want to shift. Tried leaning out the motor until it started stalling out on top end. Temps are still low, around 175, but stalls on top so quit leaning. New engine, ran 5 tanks on it about half throttle and such. SMokes quite a bit. can't figure it out. Acts like it needs leaned to shift, but when i scream it out, it stalls. still not shifting.