Needle clip position - Yamaha Raptor Forum
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post #1 of 30 (permalink) Old 03-24-2010, 07:24 PM Thread Starter
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Needle clip position

What is the best needle clip position for raptor 660 with yoshimura pipe, stock airbox setup and 150 and 155 main jet sizes and what is the # of turns out on the mixture screws. How the heck do you adjust the mixture screws when you have to take the carbs off every time you want to adjust them? Should I set them and forget them or should I keep ripping off my carbs 100 times to get them perfect? Thanks for any help.
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post #2 of 30 (permalink) Old 03-24-2010, 07:26 PM
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what needles do you have? yosh pipe......slipon or full?

02 raptor 660/804 hybrid
804cc. 5150 cam 14.5:1 BIG carb
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post #3 of 30 (permalink) Old 03-24-2010, 07:30 PM Thread Starter
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Needle clip position

Stock needles and a full yoshi system.
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post #4 of 30 (permalink) Old 03-24-2010, 08:47 PM
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The position that makes it run best between 1/4 and 3/4 throttle - experiment, grasshopper.

'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
'02 Honda 400ex, DiamondJ +3 A-arm widener, Lonestar anti-vibe
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post #5 of 30 (permalink) Old 03-25-2010, 12:15 AM
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Quote:
Originally Posted by thehorseskis1 View Post
What is the best needle clip position for raptor 660 with yoshimura pipe, stock airbox setup and 150 and 155 main jet sizes and what is the # of turns out on the mixture screws. How the heck do you adjust the mixture screws when you have to take the carbs off every time you want to adjust them? Should I set them and forget them or should I keep ripping off my carbs 100 times to get them perfect? Thanks for any help.
Mixture screw options.

http://cgi.ebay.com/ebaymotors/YAMAH...Q5fAccessories



Or

http://vitosperformance.com/atv_part...roductid=11149


2006 YFZ450
2003 RAPTOR 660
2001 YZ250
WORCS #71
BITD #616
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post #6 of 30 (permalink) Old 03-25-2010, 12:22 AM
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I must admit that the extended pilot screws are just about one of my favorite mods! They're relatively cheap and make adjustments a breeze.

'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
'02 Honda 400ex, DiamondJ +3 A-arm widener, Lonestar anti-vibe
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post #7 of 30 (permalink) Old 03-25-2010, 06:23 AM
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Or just use a screw driver bit for a drill or cordless screw driver.

You don't have to adjust your fuel screws that much any way. Once they are set you can pretty much leave them.

2003 Limited Edition Raptor
Kenz 720cc 11:1 stroker, +1 valves, Mega Cycle X-4 Cam, Sparks 6x Big Core, Keihin 35mm FCR's. 158 mains, 52 pilots, fuel screws 2 turns out.

97 Banshee
F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.
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post #8 of 30 (permalink) Old 03-25-2010, 06:32 AM
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Both the fuel screws and the needles are set to the bikes best performance, all any body on thi site can tell you is a starting point, and after that you have to try and find where the best setting is..................


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #9 of 30 (permalink) Old 03-25-2010, 03:25 PM
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I wouldn't get the ones on top. The tips are totally different than the stock screws. The pilot circuit suffers from it.

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post #10 of 30 (permalink) Old 03-26-2010, 09:33 AM
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Quote:
Originally Posted by iluvdirt View Post
The pilot circuit suffers from it.
Can you elaborate?

2008 Raptor 700 and 2004 Raptor 660
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