38mm a/s carb

[ESR250R]

here are some pictures of my new 38mm a/s carb and motion pro line i just recieved. does anyone have any recommendations on jetting. i am running a lrd ported cylinder, stock cage with boyseen reeds, trx 5 pipe, and a milled head. i think it uses the same jets as the stock one but i need to know where to start with jetting. i think i was running a 165 with the ported cylinder (158 with stock) i dont know were to start with the new carb.

[ESR250R]

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[powerslider]

Are you running the airbox lid? For the cold temps try a 175 main, 4th groove on the needle and 1 1/2 turns out on the airscrew to start.

[ESR250R]

i have the lid removed. how do i tell if this carb is a airstrker. all it says on it is keikin PWK?

[powerslider]

From the photos it's an Airstryker, the vent lines and the two fins in the venturi are clues. It probably has a 170 main jet in it but you want to start out rich and backdown one step at a time till it runs clean. Do the plug checks at various throttle positions to check the settings.