from searching web does anyone thing a loose rocker could make a clacking noise but only clack when at w.o.t but not do it when you pull back a little sorry for being all over the place here but searching to find something that explains my problem
Appears to be a terminology issue, and think your clack would be my tap. If it is a rocker coming loos or lifter collapsing then for each cylinder you loosing more power. A compression and leak down test will give you the health of the motor.
Now if the clacking is a pinging from the motor running lean then maybe fuel pressure, Carb should have 3 to 7 psi
Hello
still having issues motor makes a clacking sound under load over 3200 rpms here is a video that found that sounds exactly like mine https://youtu.be/HRyOwnhQwgE
