Hi Oakrad
I have a similar problem with my 3AJ.
After riding for 15 mins or when engine got hot bike would miss above 3500 rpm if I let engine cool down (20 minutes) bike would run fine untill it got hot again.
My carbs seem ok I changed the coil, HT lead and cap, new spark plug cleaned air filter, checked tappets used a differnt CDI but not fixed.
I then changed the stator for an aftermarket stator. This fixed the problem of the missfire above 3500 rpm but the bike felt very low on power when accelarting. I then tried another aftermarket stator with a differnt pick up and bike seems fine.
So I think my bikes stator and pick up were the cause of my missfire.
When you clean the carbs make sure you remove and clean the small filter under the float needle as this can get blocked and also cause a missfire as bikes runs low on fuel but if you stop bike will start and run fine at low speeds.
Where are you located Oakred?
Does any one have a pick up for a 3AJ they want to sell.
Thanks
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