Correct jetting for stock GX390

[Abtheman28]

Hi guys,

Another question...

I have a stock standard Honda clone GX390. I am wanting to rejet my stock carb with the addition of a pod style airfilter and exhaust header pipe off NR racing website.

I am unsure what sized jetting I should use to achieve a reliable motor that will not require tuning after I replace the jets. Also should I replace the emulsion tube while I'm. At it?

I never intend on doing any further mods. Basically this is all I plan on doing. Mainly so the engine looks nicer from the outside with pieces added

 

[Denny]

I would talk to NR and see what they recommend.

 

[Abtheman28]

.92mm main jet is what the recommended for my stock GX390 clone motor. Pilot jet and emulsion tube to remain standard as stated by NR racing.

 

[Denny]

That is where I’d start then.

 

[KartFab]

.039-.041”