Built engine as follows
130 polini case transfers matched, race crank, Simonini d & f. with 16
degrees igition timing. Standard gearing set up.
25PHBL running 92 main & D22 needle, 262 atomiser ( set on 2nd clip).
Its only reachin 80-85km with poor acceleration.
Will the exhaust be the problem or can you suggest adjustments to the
carburretor. Plug colour is mid brown with any main jet used between 90-95.