carb quetion

[jesse1004]

I have a 39mm keihin single carb with the pod and a trinity intake. My motor mods are a FAST low to mid port, bored around .60, lightened flywheel, advanced timing +4, dyna ignition, crank trued and welded, fattys, and coolhead with i believe 20cc domes. I was wondering if you guys think it is possible to run the carb out of fuel. When im just tearing around on the trails and half ass tearing it up everything runs fine. But when I like up to race and really open it up it cuts starts to cut out like its starved for fuel. I do still have the stock petcock on it. Do you think that needs to be changed? and also do you think maybe its a needle issue? jetting seems to be pretty damn close, so its throwing me for a loop. any help would be appreciated.

 

thanks in advance

Edited March 5, 2008 by jesse1004

[Snopczynski]

float level? Needle? Main jet? pilot jet? clip position? Air screw turns out? Is it an airstryker?

[jesse1004]

needle- r1370g 1st clip

main- 215

pilot-58

air screw- 1/4 turn out

its a pwk

 

I have no idea how to adjust float level and I believe the air screw is the little brass flat headed screw? there is also a big screw with a large plastic grip to turn. Carbs are not my strongpoint.

[jesse1004]

[Snopczynski]

needle- r1370g 1st clip

main- 215

pilot-58

air screw- 1/4 turn out

its a pwk

 

I have no idea how to adjust float level and I believe the air screw is the little brass flat headed screw? there is also a big screw with a large plastic grip to turn. Carbs are not my strongpoint.

 

I have no clue what needle that is. It should say ie dek or eej on it. Thats seems to be too big of a main, and too big of a pilot jet. Float level is checked at float bowl mating surface to the seam on the float, as the float arm just contacts the needle without pressing it in. It should be 11mm.

[elwilliams13]

Yeah if you are rich on the main it will be boggy at WOT and seem like it is out of fuel but you really have too much fuel. I am running the single 35 PWK still tuning it but I am down to a 185 main and am running good with plenty of power and similiar mods as you.

[jesse1004]

Yeah if you are rich on the main it will be boggy at WOT and seem like it is out of fuel but you really have too much fuel. I am running the single 35 PWK still tuning it but I am down to a 185 main and am running good with plenty of power and similiar mods as you.

Ill try a smaller jets and a different needle. how you do against 450's. last time I went out I was having a hell of a time. but i was cutting out too.