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View Full Version : Jetting Help!!


bob4558
12-15-2011, 09:28 PM
I just changed over from a 28mm round slide mik to a 28mm flat slide TM series carb.I was running a 235 main jet in the round slide so I put a 230 jet in my TM the engine just boged when I hit the fuel soo I jetted down to a 180 main still boggs any help?
hotquads1
12-16-2011, 08:45 AM
I think you may have went the wrong direction on your jetting change, bogging is normally a sign of too lean , try going up several jet sizes .
bob4558
12-16-2011, 10:10 AM
OK. IS ANY RUNNING A TM28 AND WHAT SIZE JETS?
nastynotchback1
12-16-2011, 01:19 PM
you mean a 135main or is that 235 right?
bob4558
12-16-2011, 06:21 PM
I WAS RUNNING A 235 IN THE ROUND SLIDE RAN GREAT!
bob4558
12-16-2011, 06:24 PM
I FOUND MY PROBLEM MY FLOAT LEVEL WAS TO LOW!
nastynotchback1
12-18-2011, 07:30 PM
Glad you got it fixed but i don't run jets that big in my highly built 450.
bob4558
12-19-2011, 07:28 AM
It is high but that what the engine likes! I think the carb mite to big?
jerkyboy
12-19-2011, 05:21 PM
Some of those carbs run diferent jets. And they go buy a different number scale.
bob4558
12-19-2011, 06:22 PM
I will look into that thanks.
nastynotchback1
12-20-2011, 06:08 AM
Originally posted by jerkyboy
Some of those carbs run diferent jets. And they go buy a different number scale.


AHHH i see.
bob4558
12-20-2011, 09:19 AM
What for carb and jetting are you running?
nastynotchback1
12-20-2011, 10:44 AM
Originally posted by bob4558
What for carb and jetting are you running?

28MM PWK With 155 main and 50 pilot on our 70cc

My 450 has a fcr 41mm and i think its 195 main
bob4558
12-20-2011, 04:39 PM
Your running a Keihin carb! Mine is Mikuni 28mm. You like Keihin?
nastynotchback1
12-22-2011, 07:01 AM
Originally posted by bob4558
Your running a Keihin carb! Mine is Mikuni 28mm. You like Keihin?

I like the pwk series.My next choice would be the stage6 pwk knock-off.I would stay away from the round slide Keihin.Never had any luck with those.