Carb settings - Yamaha Raptor Forum
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post #1 of 3 (permalink) Old 08-16-2018, 08:58 PM Thread Starter
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Carb settings

I have a 2003 raptor 660. Everything on the quad is stock besides a Yoshimura slipon exhaust and a K&N air filter with the K&N air box lid. What settings should the carb needles be set on?
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post #2 of 3 (permalink) Old 08-19-2018, 12:02 AM
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Did you get new jets with the K&N lid? If so you need to install them because the K&N breathes better than stock and itll make it run too lean. You shouldnt need to change your needle clip position since the quad is fairly stock still.

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post #3 of 3 (permalink) Old 08-20-2018, 05:39 PM
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With open or holed lid you need DJ main jets: 146 in the left, 148 in the right (equiv to Mikuni 160 left, 165 right); DJ needles 1 notch rich of center and Mikuni 25 pilot jets with fuel screws at around 2.5 turns out from gently closed.

Of course, this assumes that all your carb's passages have been thoroughly cleaned out and the choke plunger works properly.

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo

Last edited by QuadManiac; 08-20-2018 at 05:46 PM.
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