b-nasty Posted June 16, 2010 Report Share Posted June 16, 2010 Im wanting to fire up my 421 cub that ive been building but I need some advice on setting up my carbs so I dont hurt the motor. Any help would be apprechiated. Carbs are 39mm mikuni setup for alky with powerjets. Motor is a 421 drag ported cub, 68mm cubs with blaster pistons, 4mm hotrods crank, cases and cylinders have been ported, shear big bore out of frame pipes, RDZ coolhead with 20cc alky domes, timming set at +4. Let me know if you guys need anything else or I need to change something. thanks Quote Link to comment Share on other sites More sharing options...
tedd1 Posted June 16, 2010 Report Share Posted June 16, 2010 Alky cubs like a little more timing, mine is 8* btdc with stock ignition. Start with your PJs all the way open and work down from there. Read >THIS<, scroll to post #34. Rick Quote Link to comment Share on other sites More sharing options...
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