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Big bore or cam or both???

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I have a 1997 XR250R. I want to get a big bore kit or a cam. Which one will I get more power and response out of. I have looked at big bore kits and cams from XRs only. What am I better off getting without sacrificing my low end torque and XR reliability. And another thing is the cams are almost 200 dollars!! That is ridiculous. They are both about 200 dollars.

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I have a 1997 XR250R. I want to get a big bore kit or a cam. Which one will I get more power and response out of. I have looked at big bore kits and cams from XRs only. What am I better off getting without sacrificing my low end torque and XR reliability. And another thing is the cams are almost 200 dollars!! That is ridiculous. They are both about 200 dollars.
It's more like $150.00 for the cam and $150.00 for the piston. The parts needed are listed in MAR's sticky.

Here they are:

The Wiseco piston part number I used is 4466M07700.

Hotcams part# 1006-1.

Honda valve stem seal part# 12209-GB4-681 qty. 4.

Cometic top end kit# C7146.

Honda head cover gasket part# 1391-KR6-010.

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