Methanol - jetting

Bike is not running rich now and was flying at Cadwelll. Just holding on to OHC 500s. Turned out the Boyer black box was the problem doing some odd things - fitted a new box cured what apeared to be carb problems.
I’ve 32mm and 30mm mk2’s both new and new chrome slides. All fine when cold but after 5 mins running just holding the revs at the low end - dropping after 5 seconds. New cable, no sharp bends and snaps shut when off even with the motor fully warm. Still did it with a wrist breaking strong spring.
Anyway I’m pensioning off the 350 for now as it’s too peaky for hill climbing. Putting a Jawa 500 in until I find time to build the Norton into a 500.
Mk2 Amal’s are being sold and will fit a Mikuni if someone can advise the jetting and needle setup. Or a Dellorto.
 
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