Keihin jet size help.

[redwhiteblaster]

I was wondering if you guys could tell me were good jet sizes to start with would be because the guy before me thought it would be a good idea to scratch off the numbers. I have a ct header with fmf silencer, boyseen rad valve reed cage and reeds with spacer, uni filter, and the carb is a pj34. The temp is around 60 degrees and i live in Iowa.

 

[Herpderplol]

What airbox are you using if any? or is the pod filter on the carb direct?

 

[redwhiteblaster]

Well right now it's the stock air box with the end cut off and a 2 3/8 inch pipe epoxied into the air box. Then i used a boot to connect the pipe to the carb. I know its not right. That's why i'm getting a cfm air box soon. The air box lids off also.

 

[redwhiteblaster]

I bought a pod filter today for it.

 

[Awk08]

without knowing your elevation (lower elevations require richer jetting)
and it's also going to be dipping below 60 degrees average real soon,
I'll suggest a rich range to be safe............

16mm float height
45/48/50 pilots
DGH needle/middle clip position
148 - 155 mains
6-10 ngk b8es plugs for plug chops

I've used 45 pilot, then up to 48 with more engine work, some guys at lower elevations have good luck with the 50
you'll need to do the airscrew tuning procedure to determine which pilot:
http://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/

you may want to 1/2 throttle plug chop to tune the needle, I like to lower the clip until it rich bogs, then back up 1 clip position, the middle works for me

start large and plug chop down the main jets:
http://www.blasterforum.com/threads/how-to-plug-chop.53237/