mikuni carbs or keighin

[speedfreek1]

i was wondering if a few people who have ran these carbs could give me some input i just built a 421 drag port i was wondering how a 421 runs on 38 39 mikuni carbs flat slides , which ones do you recommend are beter mikuni or keighin and are easier to jet also what do the mikuni carbs go for new

[BigRed350x]

i was wondering if a few people who have ran these carbs could give me some input i just built a 421 drag port i was wondering how a 421 runs on 38 39 mikuni carbs flat slides , which ones do you recommend are beter mikuni or keighin and are easier to jet also what do the mikuni carbs go for new

 

If all you are going to do is straight drag racing then the 38 or 39 would be a good size choice. If you are going to do any recreational riding with it, then go with a smaller carb like a 34 or 35 and recover some of your throttle response. I personally prefer the Keihin carbs. Both are about the same to jet. The mikuni's are a bit bulkier under your seat and take up a lot of room around the pipes. I also like the screw off tops on the keihin carbs more. The mikuni's usually use 2 screws to hold the tops on and they like to strip out like the float bowl screws.

 

Drag Racing I'd go with a 39PWK

Recreational Riding I'd go with a 35PWK or 34PJ

 

Call Kevin at Herr Jugs Racing, he can get you whatever you end up going with.

Edited December 24, 2010 by BigRed350x