2003 Raptor 660 ?Jetting? - Yamaha Raptor Forum
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post #1 of 15 (permalink) Old 01-18-2010, 06:54 AM Thread Starter
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2003 Raptor 660 ?Jetting?

New to the forum and have been doing some searcing and cant seem to find the correct jetting i need. I ride in Connecticut basically no more then 1000'ft above sealevel. When i purchased 660 a few months back it had a CT exhaust with the k&N air filter and airbox lid cut. It is too loud for where i ride so i picked up a used stock exhaust and will get a new lid cover for the airbox so water does not get in. i will keep the k&N airfilter in.
my question is what should the jetting be with basically the only mod being the k&N?
mains?
pilots?
needle setting? etc?
thanks for the help in advance
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post #2 of 15 (permalink) Old 01-18-2010, 07:06 AM
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Quote:
Originally Posted by smitch022002 View Post
New to the forum and have been doing some searcing and cant seem to find the correct jetting i need. I ride in Connecticut basically no more then 1000'ft above sealevel. When i purchased 660 a few months back it had a CT exhaust with the k&N air filter and airbox lid cut. It is too loud for where i ride so i picked up a used stock exhaust and will get a new lid cover for the airbox so water does not get in. i will keep the k&N airfilter in.
my question is what should the jetting be with basically the only mod being the k&N?
mains?
pilots?
needle setting? etc?
thanks for the help in advance
You can pretty well go back to stock, #25 pilots, with about 142 main on the left and 145 main on the right carb..........


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #3 of 15 (permalink) Old 01-18-2010, 07:52 AM Thread Starter
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thanks.
How many turns out of the pilot screws? and where should i set the clip on the needle?
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post #4 of 15 (permalink) Old 01-18-2010, 12:44 PM
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Did you try to take some disks of the end of the pipe to quiet it down? That is an option you have with the ct exhaust.

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 #5 of 15 (permalink) Old 01-18-2010, 01:09 PM Thread Starter
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no i have not, i did not know you could do that. what is the purpose of the disks? if i was to remove all put one would i have to rejet or anything?
thanks
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post #6 of 15 (permalink) Old 01-18-2010, 01:50 PM
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you may or may not have to rejet when discs are removed depending on how well it was jetted before

the point of the discs is to free up the exhaust system more or cork it back up and tone the sound down...

i would go with willys jetting for the stock pipe with airbox lid on..although i beleive 142 mikuni main is a half size and may be hard to find...they should go up in 5's 140 145 150 so on...i know dyno jets use funky numbers like 142 and 148 and crap liek that lol but there numbers represent somthing different then mikuni...but basicaly the dyno jets run 1 size large compared to mikuni...meaning a 142 dyno would be in between a 145 150 mikuni 148 dyno is in between a 150 155 mikuni...
its much easier to stick with mikuni style jets though if buying a jet kit later or needing to buy jets to rejet for the stock pipe

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39 FCR's Clamp On K&N's
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post #7 of 15 (permalink) Old 01-18-2010, 02:22 PM Thread Starter
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thanks for all the help i will be going with willies suggested jetting.

any ideas where i should set the needle Clip? 5th clip?
and should the pilot screws be out about 2 1/2?

thanks for the help again. And if all works out i may have a CT racing exhaust with the 16 disc for sale (it looks and works perfect).
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post #8 of 15 (permalink) Old 01-18-2010, 03:35 PM
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needle in the middle clip stock jets are mikuni 140 145 mains 22.5 pilot mix screws at 2 and 2.5 so the right carb is 145 and 2.5 out.... the left carb is 2 out and 140 main

740 14:1 Piston Moly Coated/Ceramic topped
Total Seal Rings
Nikasiled Cylinder
Lightened/Moly Coated Rocker Arms
X4 Cam
Ballanced Crank
Long Rod
Lightened Counter Ballancer
GYT-R Clutch, Hub Pressure Plate & Basket
Duncan Head modded by Me +1 valves Flowed/Matched Trinity Billet Intake Manifold
39 FCR's Clamp On K&N's
Barker Exhaust
Lightened Flywheel
YFZ-450 Front Shocks & calipers
Fluidyne Oversized Radiator
High Flow Waterpump
X-33 Axle
Yukon HD Trans
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post #9 of 15 (permalink) Old 01-18-2010, 06:14 PM
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Needles are usually in the middle clip position and pilots are usually about 2 to 2.5 turns out as previously suggested........


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #10 of 15 (permalink) Old 01-18-2010, 08:47 PM
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Quote:
Originally Posted by smitch022002 View Post
thanks for all the help i will be going with willies suggested jetting.

any ideas where i should set the needle Clip? 5th clip?
and should the pilot screws be out about 2 1/2?

thanks for the help again. And if all works out i may have a CT racing exhaust with the 16 disc for sale (it looks and works perfect).
Say - Im in the market for the CT exhaust and I live in Conn. PM me and perhaps we can make a deal. SAlso, jets can be found at Jetsrus.com. Good luck!

Last edited by THUMPER 01; 01-18-2010 at 08:51 PM.
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