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2003 ttr 90 carb problems

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i have a 2003 ttr 90es i cant get the bike to run right on the stock settings

it has a 90 main and a 12.5 pilot

it starts to cut out abought 1/3 throttle

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Same problem with my son's 2007. Apparently they all have the same problem. The shop put in larger jets. I am not sure what size they used but I think there are recommendations here somewhere. It runs a lot better now.

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