Cant get her run properly.

[Tompasio]

Its a GSX 750 ES -1983.I have change the exhaust to a Marshall 4-1.Rejetted Main jet to 125 (120 standard in Europe),raised the needle 1 step,Pilot screw 2 turns out.But when i ride it at full throttle the bike stops in acceleration for a moment,She dont rev up like she should.
What more can i do?PLEASE ADWISE!!!!

[chef1366]

Pull the plugs and see what colour they are.
Black lower main jet
White raise main jet
After you get the main jet dialed in work on the needle then the pilot circuit (idle)
You may have to go up one on the pilot jet also.

[almarconi]

Another thing to consider is your fuel level. Make sure this is within specifications. If the level is too low this could account for a lean condition.
You may also want to try going up a little on the main jet.

[Jesse002100]

go 135 jet and keep the needle where it is if the 135 is a bit much lower the needle to compensate

[Tompasio]

Pull the plugs and see what colour they are.
Black lower main jet
White raise main jet
After you get the main jet dialed in work on the needle then the pilot circuit (idle)
You may have to go up one on the pilot jet also.

Sparks are totally white.

[chef1366]

Sparks are totally white.

The plugs are a portal into the engine. Reading plugs will aid you in tuning.
Go up on the main jet.

[blowerbike]

ummm,
GS vaccum carbs require jet kits......................................
fiddle with it till the cows come home unless UK bikes have adjustable needles.
you guys know better than this.

[blowerbike]

dammmit,
i assumed he's running without an airbox..
you know what happens when a person assumes.

[BassCliff]

Hi,

Here's a couple of guides...

For CV Carb jetting, see the very informative article at Factory Pro. Also see the carb jetting tips at Motorcyclecarbs.com, Inc.


Thank you for your indulgence,

BassCliff