I think I'm the only one not having good luck with the .21 pre-run. This motor gets great reviews and I would like to add to that sometime.

One problem I'm having now is chattering coming off throttle. To me this is a sign of the bottom being too lean. Even with the LSN being rich (backed out slightly past flush with housing ) it still does it. Actually, the HSN is slightly rich too. Maybe it's an air leak? Any ideas?