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Yamaha 600 Grizzly Rich Mixture

Go to solution Solved by Mech,

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I have a Yamaha grizzly 600 that smokes and seems to have a rich mixture. I can't find that it has any high speed mixture adjustment. It came with a carb which was supposed to be new. Would a new carb have such a problem? The float had to be set quite low to avoid overflowing the bowl which could suggest a poor needle valve. I don't know if that related. Anybody know what my problem is?

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The high speed mixture is changed by moving the slide needle or changing jets. There will be an idle mixture adjustment somewhere though, perhaps underneath at the front/engine side and facing downwards.

Aftermarket carbies often need some adjusting to get them to run right.


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  • Solution

To adjust the slide needle you take the top cover off, pull the slide up, take the needle out taking careful note of where the spacers above and below the C clip go(look carefully, they are different thickness), Then shift the C clip up or down to another groove in the needle. Putting the clip higher makes it leaner.

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If you found the air fuel mixture screw I would try adjusting that first to see if it helps, if not then move the needle , on a new carb you should not have to move the needle, this is just a suggestion , all aftermarket carbs should be close enough to factory to run properly for a while. Thats my experience .

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  • Admin changed the title to Yamaha 600 Grizzly Rich Mixture

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