Jetting that works, collecting info - Page 4 - Yamaha Raptor Forum
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post #31 of 290 (permalink) Old 05-01-2007, 08:37 PM
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Re: Jetting that works, collecting info

I would start with those mains and see how it works.

And go for 25 pilots with about 2-2.5 turns to begin with.
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post #32 of 290 (permalink) Old 05-01-2007, 10:51 PM
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Re: Jetting that works, collecting info

Originally Posted by jerry smith
Ive searched and cant find what i need.
I need a good place to start on Jet size, pilot size, and air screw settings for :

Stock 660, K/n filter, no snorkel, scorpion slip on, Stock needles at 3rd about 850-900ft ASL

I would guess i could bump the mains to about 155(R?)/160(L?) (mikuni sizes?), but i have NO clue about my pilot jets
And im also guessing 3 turns on the R, and 2.75 turns on the L air screws
Am i close?
On the money man.

Try a 25 pilot, and you're set.


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post #33 of 290 (permalink) Old 05-12-2007, 09:45 PM
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Re: Jetting that works, collecting info

Just jetted my 660 for a Yoshi full system I am at 1350ft above sea level and have no lid and went with 148/150(DJ) with 3 turns out on the air screws and she pulls through the gears like a mule!!!

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post #34 of 290 (permalink) Old 06-27-2007, 02:12 PM
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Re: Jetting that works, collecting info

ok, i got all my parts installed, but it spits and sputters at low rpm's. just starting out normal in 1st gear i dont notice it very much. but if i race someone and start out in 2nd, about half the time it will cut out when i drop the clutch. the engine will stay running, but i have no power. same goes if i am playing in the sand. if i slow down while in 2nd, then crack the throttle to spin around, if the engine is running slow, sometimes it will just sputter around. i installed a k&n/proflow filter setup, no airbox lid, and sparks big core. went with a gytr jet kit. installed 165/170 mains, 25 pilots, gytr needles with clip on 3rd (middle) notch. i couldnt get it to run worth a shit with the a/f screws out 2.5 -3 turns like everyone else under 3000 ft is doing. i ended up going all the way to 1.5 turns out on both carbs. seems to run fine now, other than the problems i just told you about. spark plug looks pretty good. mayyyybe a hair lean. also, on decel. it will backfire a little bit. not alot, but enough to bug a guy.

ANY SUGGESTIONS? do i need to bump up to 27.5 pilots and readjust the a/f screws? move the needle clips to a different notch on the needle?

2005 719 trail beater

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RPM Dominator II +4 axle, homemade +2 swinger, Elka shock & link customized by Wiigstyle Racing
ASR +2 a-arms, raptor 700 shocks
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post #35 of 290 (permalink) Old 06-30-2007, 08:48 AM
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Re: Jetting that works, collecting info

02 660R
Location: Buffalo, NY
Elevation: 700 Feet Above Sea Level
Jets: Mikuni
Exhaust: Yoshi RS-3 Complete
Intake: Pro Flo Filter no lid

Pilots: 27.5
Fuel Mixture Screws: 2 1/2L - 3R
Needles: Stock on 3rd clip
Main Jets: 160L / 165R

2002 SE Black
AC Nerfs, Armidillo Skids, YFZ SE Shocks, AC Grab Bar, G-Force Axle, Gibson Dampner, ProFlow Kit, AC Bumper, Motion ProTwist, HD Holeshots, Yosh RS3 Comp
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post #36 of 290 (permalink) Old 07-02-2007, 08:08 PM
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Re: Jetting that works, collecting info

01 660r
Location: Bogalusa, LA
Elevation: 50 ft asl
Jets: Mikuni
Exaust: HMF slip on
Intake: No lid, air filter screwed to box

Fuel Mixture screws:2.25 turns out
Needles:3rd clip
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post #37 of 290 (permalink) Old 07-05-2007, 02:53 PM
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Re: Jetting that works, collecting info

Oregon coast. 165/170 mains,27.5 pilots,dyno jet needles third clip from top with factory washer and plastic spacer.2 1/2 out on fuel screws,This was on raptor with pro-flow intake no lid,Yosh full exhaust,big gun ignition,17 oz trail tech lightened flywheel and 12/43 gearing.Stock internals.
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post #38 of 290 (permalink) Old 07-16-2007, 06:32 PM
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Re: Jetting that works, collecting info

2004 660R
Stock Motor

Location: Ashland, WI
Elevation: 823ft. ASL
Exhaust: Yoshimura RS3 Comp Full Exhaust with quiet core spark arrestor
Intake: Modquad pro-flow kit, K&N filter with Outerwears pre-filter, no lid
Jet kit: DynoJet Stage 2 kit - DJ springs and needles and mains
Needles: 3rd clip
Mains: 146/148
Pilots: 27.5 (mikuni)
Mixture: 2.5 turns out

Runs great for me, I pulled out the quiet core and OMG!! What a difference in sound! I'm not sure If I need to do anything with the mixture screws with the core out. I have another quiet core, I think I'm going to chop it in half and see how that works. As much as I would love to run with the core out, I would be begging for a ticket.

2004 660R<br />Maxxis Razr2 Tires<br />ITP C-Series Sport Wheels<br />G-Force Extended Axle<br />Hydrodynamics USA +2 A-Arms<br />YFZ 450 Front Shocks<br />Streamline Front Brake Lines<br />Stainless Warning Labels<br />Acerbis Handguards<br />GYTR Chassis Skidplate<br />Yoshimura RS-3 Full Exhaust <br />Modquad Air Flow System with K&amp;N Filte
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post #39 of 290 (permalink) Old 08-01-2007, 05:32 PM
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Re: Jetting that works, collecting info

I have a 2003 stock motor & I put a modquad with a K & N Filter, RS-3 full yoshi exhaust, and DJ Jets. I wanted to do the Clear Tube Method. I have read through MANY posts and really didn't see anything, but can anyone give me a good starting point for jets & Pilot? Should I rejet and then do the clear tube or is doing both at the same time fine?
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post #40 of 290 (permalink) Old 08-01-2007, 06:15 PM
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Re: Jetting that works, collecting info

do one at a time
at the top of modifications for 660s there is a dumbed down way to do the clear tube

I put My Connecting Rod Directly through my Alluminum Skid Plate......

Let the Part Out Begin hahaha
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