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Help me Burned- BIG BORE advice

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I running an 03 KLX 400R, dirt model. Stock with E cams, FCR39, Power core 4 pipe, Hi-flo header not the powerbomb, snorkel out. I ride only tight single track trails.

looking for advice on big bore kit(Best one out there, most reliable, best bang for the buck). I'm thinking lukes racing 435 kit with the JE piston. The bike already jetted perfect for altitude with current set-up(your good advice).

How would I jet for the big bore kit?

I ride 2000 ft up to 8000 ft

I dont want to go over the syock 12.2 to one compression ratio, so I can run 91 octane

Anything, let me have it?

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