update on the 250 it is running much better, not 100% yet but about 90%. apparently the valves were set way to tight. i had set them by an old chiltons manual which agreed with every other book i read but for some reason didnt work.
i did a leak down test on every cylinder and found air coming out of the exhaust and the carb. so i loosened the valves till the air stopped coming out and started it up running much better, valves not clattering.
