OK last week, I changed the heads to some smaller cc heads I used a few years ago. the compression is now up to 115 psi. volume of heads with piston tdc is 20.75 cc. measured squish at .049".
while the heads were off I noticed a power valve with a cable pulled out of it. I am happy a found this but it surprized me as I assembled this engine a couple of years ago,and it was always a pooch. Must have happened at the time.
When testing 2 days ago, I immediately installed another gram in the tips and it was over revving at 8600. I typically try to run at 8400. the machine easily pulled up to 100mph.
yesterday I took the machine to the local snow drags and placed 2nd in both the 7 imp and 9 imp. While I prefer to win, it was up against some strong machines and I am happy with the results. the sled was hitting just above 90mph (speedo) at the end of 660ft.
Mr Viper- I will look for a spare set of carbs and try this as well. hopefully it is even better.
when the carbs were tapered bored, I don't believe he went up to the idle well, but I will confirm when I remove the carbs next time.
Thanks everyone for your support.
