09-11-18, 11:42 PM
I had a similar problem once. The bike would idle normally but when you went to pull away cylinder 3 would misfire at low revs but then run normally again up the rev range and the problem got worse when it rained. It was caused by arcing through the spark plug caps. I think you're symptoms are a bit different though. It sounds like cylinder 3 is totally dead at idle and then comes good up the revs so to me that sounds like a problem with the idle circuit in the carb but checking the spark plug caps and trimming the ht lead is easy to do so I'd start with that