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400ex 440kit

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You will need to do jetting work yes, and you might also want to run an exhaust system. Be warned, as soon as you put a big bore kit in it, the engines reliability drops... My buddy has a 440 kit in his bike, and it's a beast to start, especially on cold days. It's jetted properly too.

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It also has a Curtis Sparks Full with a jet kit. But I was also told that if you have over than 10.5:1 compression you have to run cam2?

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If it genuinely needs a rebuild, I would go 416 before I went 440.

If you are just looking for more performance with the 440, reliability will be an issue!

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thanks but also. if your comp is higher than 10.5:1 you have to run CAM2? s this true?

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thanks but also. if your comp is higher than 10.5:1 you have to run CAM2? s this true?

no but if you have a smaller one your motor would be more low end

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