Just got my engine running after an 8 month rebuild and have found that it missfires on the front cylinder. It starts and runs fine for 5 mins and then starts to miss, only firing on the top pot between 4500 to 7500 before cutting back in. This gradually worsens to 2000 - 9500 before the front pot fires again. I am thinking that it is getting to much fuel and can only burn it when there are enough sparks at high revs. I presume it will be carb related as i didn't drain the fuel from the carbs until about 1 month ago before re-building it. Which side feeds the front pot and how easy are they to strip.?. Carbs are like black magic to me, fuel goes in and power comes out!! ( usually) Thanks for any help offered.
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it's a name, not a condition

before you strip the carbs, have you checked the battery, charging system and have you checked to see the coils arnt croded on the terminals, are the plugs new, and are the caps and leads in good nic, if you didnt mess with the carbs while it was being rebuilt i would have thought it would run okay, unless youve got some dirt in there? stale fuel dosent help but if you drained it off it should be okay. someone else will be along to confirm if it sounds carb problem, but start with the above could save you some time if it turns out to be a rusty contact.