ORIGINAL: kidd
you know if it's too rich the throttle won't respond the engine just sits there sputters, and probably quit on you. the sputtering lessens the leaner the H needle is turned.
i tune mine to the fine line of sputtering and not. at full throttle.
actually sputtering on the high needle is opposite the low needle, it'll sputter on the high end when it's too lean, it won't sputter on high end under a rich condition it just won't develop full power
nzkiwi1975, it depends how is the top end on the rc? is it cracking wide open or bogging out at top end? i've always noticed when lean it'll bog out more so on top end...i've always kept tweaking the top end until i hit that bog spot then backed out about 1/8 to 1/4 turn and if the bog was gone left it alone, i've never really counted turns in it was