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Yamaha 660 Griz lean ????

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Just finished a 660 grizzly and found the valves were way out . So I set them and cleaned the carb and Ran great the first night ! Then when I went out tonight it's poping and bucking and stalling ! Plus the pipes are getting red !!? Recleaned the carb but no help. Think the valves are to tight ?? Any help would be great. It's definetly to lean!!

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If it got cooler during the night then yes it is lean, Might try adjusting your air/fuel screw 2 3/4 turns out and see how it reacts to the change. If no change then get a bigger Pilot Jet.

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Got it rite !! Some A/hole tryed to redo the carb and put the wrong washer undewr the needle jet .PLUS the intake was warped real bad and it was sucking air past the O roings underneath. Thanks for you input !!

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Glad you found the problem, a warped intake can cause problems.

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