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421 cub jetting help!


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Wow you guys are all running a lot bigger mains than I am. I have a 421 cub clean up port with shearer inframes and 34pj carbs and I am running a 50 pilot and a 148 main and have been runnning that setup for 2 years. Make sure you are turning your choke knobs all the way in and adjust the idle with your cables other wise you are going to have a hard time getting those pj's set right.

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  • 2 weeks later...

ok got the bike together and did a leak test, lost 1psi in 6min. is that acceptable? anyhow, now my left side pipe is getting hot way b4 the right side. carbs are synced pullin 4 even on the syncronizer. i got spark on both sides, what else kud it be fellas??

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Finally g the bike out riding today and she's running good. A 165main jet is still very rich, so il b dropping down to a 162 or 160 main. Maybe mess with the needle a bit and see what happens during the week. Il post up vids next week with the go pro cam. Shud have some good footage

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Fired mine up this weekend and so far seems a bit rich.

 

Set up:

421 cub stock

22cc domes from FAST

HR crank

Timing +6

VF3

35mm pwks with CEL needles 162m 55p 1.5 out

Shearer SB in frames

Nology coil and wires

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