The Basics Of Jetting *This Expains It* - Page 5 - Yamaha Raptor Forum
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post #41 of 48 (permalink) Old 05-10-2012, 04:04 PM
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Whats the proper way of adjusting the pilot fuel/air scews on these duel carbs? I've read where they should be both the same as well as the right should stay a 2 out and adjust the left only. How do you adjust the screw?

2001 Raptor 660, FMF Power-Core 4 w/ Power-Bomb header, L&A one way, K-W valves, YFZ front shocks & GT Thunder rear, Tusk nerfs, Stock gearing, No lid, Full skids, GYTR intake...
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post #42 of 48 (permalink) Old 05-11-2012, 04:39 PM
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I put them at the same level, but I have seen people running them offset by 1/2 turn (right 1/2 turn richer) without any problems.

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post #43 of 48 (permalink) Old 05-11-2012, 05:02 PM
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At low RPM, there's not much difference in flow between the left and right intakes, so equal is fine...

Just assume that something like 1.5 Left / 2.5 Right is equivalent to 2 in both... it averages out.

'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
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post #44 of 48 (permalink) Old 03-28-2013, 02:01 PM
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Can any of you guys recommend a good youtube video to explain everything you are talking about? I search and there is so many and most of them just suck! I am a visual person...thank you.
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post #45 of 48 (permalink) Old 03-28-2013, 02:16 PM
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Quote:
Originally Posted by Cassie Spicer View Post
Can any of you guys recommend a good youtube video to explain everything you are talking about? I search and there is so many and most of them just suck! I am a visual person...thank you.
This thread has lots of great pictures, perhaps it can help you out.

https://www.raptorforum.com/forums/showthread.php?t=20

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post #46 of 48 (permalink) Old 07-06-2018, 11:26 AM
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Question Need Help!!

I have a full FMF exhaust and a K&N air filter, and a dyno jet jetting kit sitting around for my 2005 raptor 660. If possible, can i get any recommendations to start the jetting for optimized performance please!
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post #47 of 48 (permalink) Old 07-06-2018, 10:50 PM
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If your airbox is open at all:

DJ 146 L / 148 R mains, 25 pilots, DJ needles 1 notch rich of center, fuel screws around 2.5 turns out.

Welcome to the forum!

'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; 07-06-2018 at 11:47 PM.
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post #48 of 48 (permalink) Old 07-19-2019, 10:34 AM
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Is there a jetting chart out there for elevation? I just picked up a 03 660 and have run it around at 5000 ft. It runs great and has all the power that I want. I will be taking it to a riding area that has elevations between 8000 to 10000 feet. The bike is totally stock with stock jets. I just want to make sure I have it jetted right to run at the higher elevations.

Dan
2003 660 Raptor
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