Yamaha Discussions about Yamaha ATVs.

Idle circuit settings for the Raptor

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Old May 30, 2001 | 10:39 AM
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garyc660R's Avatar
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What are you guys setting your idle circuit adjustment screws at? How does the plug look? I am currently at 3 and 1 turn(s) out on mine with 27.5 pilots, and would like to richen up the idle mixture a tad. Turning the screws "in" seems to richen up the mixture.....can anyone confirn this? Thanks!!!
 
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Old May 30, 2001 | 10:13 PM
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2strokeDiehard's Avatar
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Turning the screws out is richer and in is leaner. Rule of thumb is any more then 3 turns out and you need to go to a bigger pilot jet, any less then 1 turn you need to go smaller, Im thinkin of tring difrent size pilots in each carb as I'm at 1 turn on the left and 3 3/4 on the right, going biger on both would put me way down to nothin on the left one.
 
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Old May 31, 2001 | 11:25 PM
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sonic's Avatar
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What are the stock settings for the screws? I just figured they were the same on both carbs, havn't messed with them yet. thanks
 
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Old Jun 1, 2001 | 12:22 AM
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[img]i/expressions/face-icon-small-frown.gif[/img]

I'm not positive but I believe the stock setting is one turn out on both carbs. That's what I found when I rejetted for Dumont Dunes (sea level). My dealer claims that they only changed the main jets for the altitude here in Denver.
 
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