So after a bit of a break from the mighty GN, back into it.
Did a bit of research and it looked as though the white plastic washer on the needle goes below the e clip accorded to the parts cats. Swapped it over this morning and it ran fine through to half throttle then nothing, No acceleration just sat there. Occasionally it made a low popping sound but generally nothing until i backed off the throttle, then fine again. Did a plug chop (on the stand albeit) at WOT and it came out black so that suggests running rich in the top end. What I don't understand though is that moving the needle up (by swapping over the plastic washer thats about 2-3mm thick) richens it up considerably and this eliminated the flat spot at 1/4 throttle I had before I moved this. Hows that work? Is this suggesting lean out the main needle or jet and get a bigger pilot jet?
HT lead and coil are fine as I have replaced them.
Thinking of getting a new (wrecker) original carb, or sending it to a mechanic, sigh....
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