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Nice project. I'm a little jealous of that skid.

I'm not sure about going with a 38mm carb. From what I've read, I'm not sure a bigger carb will help unless you do a little porting on that motor as I think its stock porting limits its air flow. A bigger carb means less air velocity through the carb at lower rpms which can negatively effect mixture.

I can't help with clutching, though as you already know, clutching is pretty important.

On the motor, you could take .015-.020 off the head to increase compression without ill effects if you have access to 91 octane. I did that and beat the crap out of my 06 for 2 years. I didn't run into any issues until I went more aggressive with the ignition timing.....
 
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