SX/SXi/SXi Pro 93 750 throttle ?

[kickFace750]

I own a 93 750 sx, with a duel 40 mm keihn carb, pjs racing pipe, and a west coast 28cc head, it starts up and runs great, th only problem is that when I hammer on the throttle the engine bogs down and dies, it will accelerate gradually but does not take off as I would like it too, the engine has never been tuned to my knowledge and I bought the carbs used, any tips or ideas would be greatly appreciated
Thanks

 

[Hirschfelt]

sounds like the carbs are not jetted properly.

 

[kickFace750]

Would anyone know what size jets I would need to solve this problem??

 

[Magyar68]

Do you know what the Carbs Came off of? What model of 750.

 

[madscientist]

low 75, mid stock @ 45ish, and high around 125-130

 

[kiwihamish]

Did re jetting solve your problem?
I am having a similar issue, smooth on the throttle and my standard SXi (95) runs fine at any throttle setting, but stab the throttle and it will die.

 

[98SXIPRO]

had similar problem...i rebuilt both of mine and it solved the problem...i think the diaphrams were stretched..so it pumped enough gas to idle and run, but when u hammer on it it would cut out (starving for fuel)