Hello
Newbie here!
I recently purchased a new tm33 pumper carb and I am having issues. The engine runs smooth at idol but Boggs out whenever the pumper is used. I can slowly advance the throttle and everything seems to work okay. When I give it full throttle she blogs, hesitates and eventually stalls.
It is a set it up with a 140 main and a
40 pilot. The fuel screw is 1.5 turns out. My elevation is 650 feet and I am currently running a power core 4 exhaust with a power bomb header. The clip is in the middle position 3rd slot from the top.
Do you see anything I could change to help improve the proformance and get rid of the bog? My thought is to go down on the pilot jet but then again I am very new to this.
Any help you could provide would be helpful.

Thank you for you time

 

i dont know no nuttin about no dang pumper carbs, except
i will be looking for one if i cant get this d@mn CVK sorted!

what size is the main jet you are running in a middle distance lear?
i bet your KLX is getting a little better MPG than your bird !!!

 

Did you tune the air screw?

 

I did tune the fuel screw it's currently 1.5 turns out.

 

140 main and 35 pilot now?
The cv carb had 122.5 main and 35 pilot.
I'm thinking about outing the cv back in

 

Lid on or off

 

Put a 130 main & 35 pilot in it and try it. Bet it pulls wheelies.
And put the intake lid back on!

 

The lid is on. I will give that a try this morning and report back. Thanks

 

Having the air box lid on or off will not cause the problems you're having
I've found I get better response with the air box lid off

I have the Mikuni TM 36-68 pumper carb on a KLX250 that been modified to a 300
My home altitude is 2300 ft
Here's the jetting that work perfectly for me

Main Jet: 127.5
Pilot Jet: 17.5
Pilot Air Jet: 1.0 (sometimes use an 0.9 that richens the pilot circuit a little)
Needle Jet: P-4
Needle: 9EBY1-50
Needle Clip: 3rd slot from top (middle position)
Fuel/Air Screw: 2 turns out
A/P Pump Timing: Starts at 1/8 throttle and stops at 3/4 throttle
A/P Squirter: Pointed directly at the needle (fuel should splash off of the needle)
Air box lid off and backfire screen removed.

Doug

 

Should the fuel squirt from the a/p be hitting the needle?
As of now it isn't . I wonder if that's what is giving be the bog when I crack it open.