Ok to save me some time can someone point me the right way:
Timing fully retarded (err spark as late as possible)
mallossi reed valve with new reeds
PHBH 30mm with filter.
changed crank seals to be sure
no fuel pump
fitted to SS180 andusing SS180 tank
nice and smooth but pre ignites full throttle in 3rd and 4th also pre ignites worse if you drop down to 3 quaters throttle or if running at 3 qtrs downhill.
needle set in the middle, tried it fully raised but way too rich as it 4 strokes
It was on a 135 main then went upto 139 with no diffrence
plug is light brown, anyone running a similar set up?