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Discussion Starter · #1 ·
I have a 2003 Predator 500 with a CFM airbox and an HMF exhaust and headpipe. Does anyone know what jet i should be using? HMF wants a 155 for its exhaust but when I put my CFM airbox on without an exhaust it ran real lean. I'm a bit new to the predator platform and any jetting tips would be appreciated.
 

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2017 Sportsman 850 SP, 2006 Predator 500
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I would say you may need a 165 or larger depending on your elevation. Also as a side note, the stock header makes more power than any aftermarket header other than the one Doug Nicholas designed.
 

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Discussion Starter · #3 ·
I would say you may need a 165 or larger depending on your elevation. Also as a side note, the stock header makes more power than any aftermarket header other than the one Doug Nicholas designed.
I couldn’t get my hmf slip on to fit the stock header so I had to get the hmf header.
 
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