4mm 421 cub jetting

[doug]

Hi Guys,

 

I've got the new build setup:

 

421 Cub 4mm stroker

24cc Domes

39mm Keihin Carbs

Shearer sb in-frame pipes/silencers

vforce 3 reeds

k&n filters

 

elevation - 374ft /114meters

 

Any suggestions on main, pilot & needle settings?

 

Thanks.

 

[vulvafan537240]

same setup here only with vf2's and 35 pwk's and i run 48 pilot, CEL needle on the middle clip and 155 mains. yours should be close to that.

 

is yours ported? if so, how aggressive? cleanup, full drag etc.

[doug]

just a clean up port...

[vulvafan537240]

My previous post should be in the ballpark then. Maybe somebody else can chime in that has 39's.

[locogato11283]

160-162 main

48 pilot

Needle clip in the middle

Air screw .5-2.5 turns out

[bansheeboy44]

I have a drag port 421 with 39's and everything else the same and I am running 55 pilots and 185 mains at Glamis

[bansheeboy44]

21cc domes on mine

[Oregon dunner]

I have a 4mill cub with a agressive port by HJR, 19cc domes by Redline. I am running VF3 and 35pwk. My current jetting at Sea level is 152 on the main, Cel needle on the 4th and a 45 pilot. I had it tuned on the dyno at redline and it runs hard.