2002 grizzly air/fuel screw setting - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 6 (permalink) Old 09-03-2010, 11:36 AM Thread Starter
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2002 grizzly air/fuel screw setting

does anyone no what the stock setting is on a 2002 660 grizzly for the air/fuel screw. Thanks Russ
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post #2 of 6 (permalink) Old 09-03-2010, 12:27 PM
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around 2 1/2 turns out.

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post #3 of 6 (permalink) Old 09-03-2010, 01:17 PM
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Yep 2 1/2 is where to start. From there, just tune to your specific bike.

~~~~~~~~~~~~
Mine: '02 660 now in custom Hammered Copper paint
Mods: Custom air box mod for big-o' clamp-on K&N, Dial-A-Jet, 26" BH 2.0's on ITP SS 106's, SuperTrapp IDSX exhaust, Maier fender flares, black Ricochet skids. Remote res. Works A-T Steelers shocks on all 4.
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post #4 of 6 (permalink) Old 09-03-2010, 02:59 PM Thread Starter
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Quote:
Originally Posted by DizGrizz View Post
Yep 2 1/2 is where to start. From there, just tune to your specific bike.
how do u tune, i have heard to get it warm then lean it out until it cuts out then richen until it smooths out and then go 1/4 rich. sound ok or is there a better way.
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post #5 of 6 (permalink) Old 09-03-2010, 03:26 PM
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That's the basic procedure I've used. You can then dink with it to get good take-off throttle response but be careful not to go too lean. To really adjust it spot on requires either an emissions testing machine or, at least, a vacuum gauge but, since there is no place to attach a vacuum gauge to most cycle / ATV carbs, that's kinda tough. Once you have it set with this procedure, you should run it all the way back in to a GENTLE seat (never "tighten" it or you will damage the seat and/or O-ring) and count the number of turns it took to get back to just seated. If it is more than 3 1/2, you will almost certainly need to go to a bigger pilot jet 'cause your not getting enough gas and having the idle screw out farther than 3 1/2 turns is risky as it won't have enough friction to hold well and can run itself out completely from vibration and just fall out. Of course, once you run it in to count the turns, run it back out where it was again.

EDIT: Oh yeah, make sure your idle speed is properly adjusted before you start the procedure and, as you adjust the pilot screw, you may (likely) need to re-adjust the idle speed. Also be sure the engine is completely warmed up before starting adjustments.

~~~~~~~~~~~~
Mine: '02 660 now in custom Hammered Copper paint
Mods: Custom air box mod for big-o' clamp-on K&N, Dial-A-Jet, 26" BH 2.0's on ITP SS 106's, SuperTrapp IDSX exhaust, Maier fender flares, black Ricochet skids. Remote res. Works A-T Steelers shocks on all 4.
Hers: '04 660 LE (Ruby red)
Mods: same A/F mod, 1.5" billet spacers with BH 2.0's on stock wheels, Yami aluminum skids.
MY GARAGE

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post #6 of 6 (permalink) Old 09-07-2010, 03:45 PM Thread Starter
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OK checked the air/fuel screw it was to lean, as soon as i started to lean it out alittle it immediately started to cut out, i slowly backed it out until the idle smoothed out and actually came up quite abit and then richened it 1/4 turn, and it runs and sounds better. when i take it on the trail i will no if it is fully fixed but after seeing the difference i think it is. again guys
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