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what should i do next ?

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what should i do to my ktm 125 sx next ? im thinking jetting as ive recently replated cylinder and put a wiseco piston in it and also ive got a spes exhaust coming for it , do you think that it should require jetting now ?

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I'd definitly get the jetting right. You don't want to burn down a new cylinder rebuild..

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is it pretty easy to do ? and what should i get for it to be spot on , i live in scotland + i put my new exhaust on erlier on + started it up an the revs were all over the place what would cause this just the air screw ?

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To be able to jet properly you first need to be able to read a spark plug.. Then I would install the OEM jetting for your altitude and start from there..

Sounds like you need to read up on 2-stroke jetting practices..

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yes i sent it to langcourt and got it skimmed and replated and got a wiseco top end for it and its been ran in already , going great but when i stuck my new spes pipe on it last night the revs where all over the place what could cause this ? drawing air ?

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