Zilla Main Jet Sizes?

[Apher]

If I am running a 310 main jet. What are my options for 4 to 6 steps up?

I am going to Glamis, Cal. in a couple of weeks and need to rejet for about 500 ft for my current jetting at 5000 ft.

Thanks, Apher

[hiperfind]

Apher,

What year Zilla? Either way you are currently WAAAAY too lean bro! That's damn low....at 5K feet I'd use a 400 main for a 1987 with stock carb, and a 340 main for a 1988-90 stock carb....if the bike is stock. With any mods add 1-3 sizes up, depending on air temp and extent of mods.

In the 300-400 range of jets they step up in sizes of 10. So, if I were you, assuming oyu have a 1988-1990, I'd be running a 360 main this time of year with the lower temps, AND being at sea level.(once again, assuming a stock motor)