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To help in the interim, it's sounds possible from your above observations that you may have a cylinder not firing. The points each run two cylinders so if either is a problem you get both from that supply stopping and it's even hard to pull away, so doubt if it's that.More likely it could be just one. If you start it from cold and run for about 20 seconds, switch off and then feel each of the exhaust pipes youll tell if you've a cold one ( that will feel more like the "something stuck in your throat" you describe) if that's the case then ordinarily you're looking at a fault of the HT part of the system from coil through plug cap to plug itself as initial suspect. Anyway, post how you get on and shout if you wish to have help.
Are you positive you don’t have an air leak between carbs and head. That would also cause similar problems. Try spraying carb cleaner around the joints when running. I had exactly the same tickover issues with revs suddenly rising and fixed it with new inlet rubbers. I also used jubilee clips (thin stainless ones) as opposed to the old Honda clips as even the replacement ones I got (not aftermarket ) from DSS were no sealing well.From the sound of it this is more likely the problem
What spark plugs are you using?
Quote from: Nurse Julie on August 13, 2020, 01:30:21 PMWhat spark plugs are you using?Just plain NGK DR7ES they are fairly new, maybe have 30 miles on them. I cleaned them from carbon deposit because the mechanic I trusted to solve my troubles actually made it incredibly rich (4th groove on et needle!!) and as a consequence exhaust and plugs just got covered in black soot. BTW, I moved the needles back to the 2nd groove...Not sure I have a new set of plugs to try if any difference now, would that be worth it?
Remove the resisted plugs and fit non resisted (D7ES or D7EA) . You only need resisted plugs fitted if you have non resisted plug caps fitted. Too much resistance weakens the spark. I don't think it will solve your problems but having both plugs and caps fitted with resistors won't help.The DR7ES were the standard fit with the metal, non resistor caps, which were changed at PDI usually (well, thrown in the bin as I understand it).
I have the original metal plug caps one of my 500s. They all measure 5-6k ohms. I've used resistor and non-resistor plugs and never had an issue. Original plug caps on my US 500K0 are 7.5k.