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I recently bought a 2003 Yamaha Grizzly 660 and I want to get an HMF Titan Exhaust but I don’t know how I can tune the Air Fuel Ratio. Help!
 

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Welcome from Colorado.
I would stay with a 2" tip, the new exhaust isn't worth the trouble of experimenting with different jets.
 
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I recently bought a 2003 Yamaha Grizzly 660 and I want to get an HMF Titan Exhaust but I don’t know how I can tune the Air Fuel Ratio. Help!
You have to rejet the carburetor.
 
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