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netsurfer · 07-09-19, 10:52 AM

The problem seems to disappear somewhere between 3,000 and 4,000 rpm (when stationary, adjusting idle speed)

WD40 didn't seem to make any difference around intake boots or choke plungers but it's quite difficult to say for sure as the misfire is intermittent and the front boot is difficult to reach all the way around.

I have a feeling the issue could be on the front cylinder, the exhaust header (measured at the flange where it meets the head) is approx. 35 degrees (c) hotter than the rear. (no exhaust leaks anywhere on the system)

Would hate to do damage to valves from lean running, perhaps i'll pull the carbs again and put them in the sonic cleaner at work. Shooting in the dark I suppose but can't think of much else.

07-09-19, 10:52 AM	#6
netsurfer Member Join Date: Apr 2018 Location: N.Ireland Posts: 40	Re: Slight misfire after 10 year layup The problem seems to disappear somewhere between 3,000 and 4,000 rpm (when stationary, adjusting idle speed) WD40 didn't seem to make any difference around intake boots or choke plungers but it's quite difficult to say for sure as the misfire is intermittent and the front boot is difficult to reach all the way around. I have a feeling the issue could be on the front cylinder, the exhaust header (measured at the flange where it meets the head) is approx. 35 degrees (c) hotter than the rear. (no exhaust leaks anywhere on the system) Would hate to do damage to valves from lean running, perhaps i'll pull the carbs again and put them in the sonic cleaner at work. Shooting in the dark I suppose but can't think of much else. Last edited by netsurfer; 07-09-19 at 10:54 AM.