Originally Posted by (MRC)Scotty!

.24 or .21? I would say if it pulls good off the bottom then you are okay, maybe lean the HSN a couple hours. I've got a .24 and it runs 200-210 max.. And, it will rip at those temps.. The tuning instructions say to get the bottom end where it should be, Ie pulling hard off the bottom, with no bog, but no lean.. Do this by leaning the LSN an hour at a time and pulling hard from a dead stop for about 10-15 feet. Continue to lean until you see no increase in acceleration, then richen back hour.. Then set Idle, which should be close..

At this point you should be ready for HSN adjustment, and it is done by running down the longest straight away. You want it to pull good all the way down the straight with no burble, but with plenty of smoke.. Do it the same way as the LSN tuning..

Make sure engine is fully warmed up before tuning, and always try to tune at around 1/2 a tank..

Sorry if this info you already knew..