Question on HC piston. YZ400F

Ok, So I am rebuilding my motor right now and am wondering if the HC piston is work it. Looking at going with a J.E 13:1 piston. I'm not worried about paying for race gas but I am really just wondering if its worth the extra money for the extra power.

Thanks, Nick

Yes. I really don't think a high comp piston is any more expensive that a stock one if you are in the same brand (ie Wiseco 13.5:1 will cost about the same as a Wiseco 12.5:1, JE 13.5:1 will cost about the same as 12.5:1) More expensive than OEM? Yup. Worth it? I think so. Both the JE and Wiseco pistons are forged. I believe stock is cast. Much stronger regardless of compression ratio. A bit lighter, too.

Yes, you will feel a big improvement everywhere with the higher compression...but it's most noticable on the bottom end.

What is the stock compression ratio on a 400?

What is the stock compression ratio on a 400?

12.5:1

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