new carb help please

[PATTE440]

i have a 03 z400 with a high compression je piston, full lrd exhaust, and stage 3 webcams both intake and exhaust and i little port and polish on the head but not much. i am 500 ft above sea level. I cannt get the carb setup right and def need help

[Scro]

Where in the powerband is it not running right?

[cataway]

what carb?

[sd1]

stage 3 hotcams?...they only make a stage 1 now, they used to make a stage 2 some years back.....whats the carb doing?..is it running lean or rich and what jets are in it right now?

[PATTE440]

no they are not hot cams they are web cams used to have a lrd 440 in it but put it back to stock bore. it is a stock z400 carb think it is a 37mm mikuni but not positive. i have bad throttle response off ideal and when i can get it reved up then when i let out it back fires horrible. seems like there is no defference in power shifting from 4th to 5th and after holding it wide open for a short period the head pipe gets red hot. it has a 170jet in it at the time.

[sd1]

yes the stock carb is a 37mm mikuni...I assume your running with the air box lid off and a good filter....
1- when you pulled the plug how did it look?......

2-do you have a dyno jet kit in it or did you just swap out the main jet?...

3-what size pilot jet are you using and how many turns out is the fuel mixture screw...

4 - what plug are you using and what number

5 - what octane fuel are you using?

you really should be running a larger carb with a high comp pistion, full exhaust, cams and porting....an fcr39 at least...

[markk]

hey patte isnt this the carb that you ran for the last few years?? or did you the the doug eichner (SP) edelbrock carb???