yz450f carb boring or 13.5.1 je piston?

2006 yz450f would you bore the carb or put in a 13.5.1 piston.. right not it has ported head and 12.8 je piston and stage 1 hot cams and it is drag raced and I run 110 fuel because we have to at the track

 

A higher compression piston usually gives you more bottom end power. It can also make you lose top end too.

Bore the carb.  Alternatively, you can fit the carb from a CRF450R.  They're 41mm vs. 39 on the YZ.

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