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I have a 2014 trx450r with an fmf, k&n air filter with no lid, hrc cam, high compression piston, stroker crankshaft. I need to know what octane gas I should use and what size jets
 

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Making HP ain’t free. . .
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Unfortunately, you have left out the most important thing that dictates whether or not you need high octane gas, and that is your compression ratio. Not knowing that and your elevation makes it impossible to answer your question.
 

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If your 13 to 1 or over you should be running race gas 13 to 1 should be boarder line to run pump vs race, I do a mix 50/50 jetting I would start 55 leak
Hrc needle on 4th clip and a 180 main to start
 
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