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I have a 300ex fourwheeler and I have had people to tell me that boring a motor really doesnt give no power. I was thinking about buying a big bore kit but I would like to know about how much hp it will give my fourwheeler.
 

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Boring a motor will increase your power depending on how much you want to go , that along with a good cam and and valvetrain job, exhaust 400ex carb w/ jetting kit you will see a great improvement. as far as HP gains? Im not sure on that.


Welcome to the forums!!
 

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Don't be discouraged by low HP numbers. The 450 only puts out 36 stock.

Probably around 25ish.
 

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Don't be discouraged by low HP numbers. The 450 only puts out 36 stock.

Probably around 25ish.
Gotta argue a little Red look at the sticker on the right side between the upper a-arm mounting holes gives a few specs mine shows maximum HP 42.6 bbh look at yours and see if i am right, might be wrong. don't know what bbh stands for.
 

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See, I have always heard that the 400ex pushes 28hp stock. So if you knock roughly 4hp off for power loss from delivery to rear wheels that is right.
 

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Thats what i want to know!
 
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