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06drz 400sm 6,730'

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Hello, just moved my totally stock sm up here to Steamboat from NC and it burps and sputters for lack of air when I roll on the throttle.

What main jet would you suggest? I have a 140 sitting here ready to go but wanted to get your opinion. Also what of this 3x3/ Hole in the airbox mod that's mentioned all over the place?

Thanks,

Joel

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the 3x3 mod is making the intake hole 3 x 3 inches.

you need the sm dynojet kit.

3x3 mod

140 main jet

needle clip 1

stock 22.5 pilot jet

2.5 turns fuel screw

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