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K2-K6:

--- Quote from: Harriec on March 28, 2024, 08:04:13 PM ---Thanks for this. I will test the throttle tomorrow and start there. I'll also look into the idle circuit set up...

--- End quote ---

They are similar to your garden machinery in some effect. The adjustment screw on these carb is engine side of throttle slide and controls fuel (unlike predecessor, with air adjustment) winding out/unscrewing should bring more fuel to low speed.

Changing each one in isolation should bring about obvious shift in running for that cylinder, no response suggests impairment as way of assessment.

The aim in Honda setup routine is to bring them to borderline lean point to give combustion reference, then lift the mixture a little toward richer ( they indicate  100 rpm drop from that richer state) to get them as good for further evaluation. 

If left too lean on this circuit, that forces you to then run the slides lower than ideal in controlling the tickover aim point. That can give some of the inconsistencies you've currently got.

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