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CRF276R Big Bore Build

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So after adjusting my valves, my 06 still would not start, still had low compression. So I Tore it down today. Gonna need a top end so I'm going with the big bore just for the heck of it pretty much. Already ordered a 276 kit with a Wiseco 13.5:1. The bike already has a stage 3 cam installed which will compliment the bIt bore pretty well. A buddy of mine is going to port/polish the head this week. So pretty much I have no clue where to start with jetting. Im going to want to lean it out right?image.jpg

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Typically the big bore produces more vacuum in the motor. Be careful with those I know a guy port jobs. This isn't a 350 chevy...the ports on that head don't need to be any bigger than they already are. In fact they could probably use a little welding. I'm no expert with a flow bench but honda seems to like big ports. Just take out the casting imperfections and sharpen the divider between ports. Polish the ex. Port leave a haze on the intake ports for the fuel to stick to. It will help the fuel atomize.

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