Jetting that works, collecting info - Page 3 - Yamaha Raptor Forum
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post #21 of 300 (permalink) Old 03-11-2007, 07:02 AM
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Re: Jetting that works, collecting info

Hi I was wondering if anyone has any info on std raptor 660 05 model .
The only alteration I have made is to remove silencer from stock muffler.
The problem I am having is a flat spot on accelleration at about 3-4000 rpm,
and generally poor throttle response, this is noticable at free reving.
Strangley enough if i apply a piece of 2 inch ductape vertically across snorkel intake , slightly restricting air flow and increasing air box pressure this problem disappears.
Standard mains are 140 l& 145 r I ride at sea level to 1000 ft above if riding tabelands. The float levels are 3mm above carby bowl breake line,mmm I have tried different needle clip positions & air/fuel mixture settings , cleaned carbys and checked l/h carb diafram all to no avail : is this thing running too lean?
Any help would be appreciated thanks.
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post #22 of 300 (permalink) Old 03-11-2007, 09:27 PM
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Re: Jetting that works, collecting info

to find out if it is running lean, perfect or too rich, do a plug test.

Mods::::: L&A one way, Rickey stator, YFZ Shocks, GYTR cluth, Renthal bars, HMF Pipe, FMF powerbomb header, ITP Holeshot HD Tires, Dyno Jet, pro design air filter, 2.5 rear wheel spacers
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post #23 of 300 (permalink) Old 03-18-2007, 09:36 PM
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Re: Jetting that works, collecting info

Originally Posted by DECEPTiON21
yeah the tube that connects to the lid. thought this was interesting... a mikuni to DJ size chart.
Pretty sure that one's wrong, like every other chart I've seen. Unless I'm simply not able to understand how they're comparing the sizes.

Bump Bump people, let's keep posting your jetting info here so we can help others!


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post #24 of 300 (permalink) Old 03-18-2007, 10:07 PM
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Re: Jetting that works, collecting info

Williamsport pa
elevation: 2,000
Main Jets: 160/165
GYTR neddles: 3rd clip
fuel screw: 2.5 turns
pilots: #25
Pro-flow kit K&N/ no air box lid
FMF PowerBomb & FMF PowerCore 4

03 660- Sold<br />87 Suzuki LT500R-Sold
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post #25 of 300 (permalink) Old 04-09-2007, 04:38 PM
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Re: Jetting that works, collecting info

Location: Los Angeles, CA.
Elevation: approx. 500 ft. above sea level
Jet type: Dynojet
Intake mods: proflow kit w/o airbox
Exhaust: Big Gun slip-on
Pilots: 22.5
Fuel Screws: 2.75L / 3.0R
Needles: 3rd clip from the top
Mains: 146 L/ 148 R
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post #26 of 300 (permalink) Old 04-10-2007, 11:28 PM
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Re: Jetting that works, collecting info

Location: Glamis 100-300 ft above SL. So Cal high deserts, <3000 ft above SL.

Jet Type: Mikuni, DynoJet needles
Intake Mods: Pro-flow kit foam w/o airbox lid
Exhaust Mods: Pro Circuit slip-on, stock header
Porting/Motor Mods: none
Other: Freeze left intake mod, Freeze float mod and adjustment

Mains: 160L/165R
Pilots: 25
Fuel Screws: 2.5/3.0 L/R
Needles: 3rd (middle) clip

Runs awesome at 3000ft, haven't had a chance to run Glamis yet. Slight pop on decel as RPMs get low.
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post #27 of 300 (permalink) Old 04-13-2007, 01:10 AM
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Re: Jetting that works, collecting info

Fort St John Canada

2200 ft ASL

Jet Type - Mikuni Stockers
Intake Mods - Pro Flow w/o Lid
Exaust Mods - Dual Exaust Twin Titanium 4s
Motor Mods - Bored to 686, High Compression Piston, WebCam Grind #696/697, Tit valves, Cdi + 1000, 14 tooth sprocket, stock on back ( think 42 )

91 Octane Fuel

Mains - 160/165
Pilots - 25
Fuel Screws - 2.5 on both
Needles at 2nd
I hate my bike
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post #28 of 300 (permalink) Old 04-16-2007, 10:26 AM
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Re: Jetting that works, collecting info


No lid, k&n with outerwears lid, CDI from Dynatek, full yoshi exhaust,
I live in Red Deer, AB at about 2700 ft or 900m asl

165/170 mains
27.5 pilots
2.8 turns..could probably just say 3 turns on the screws
lifted needle one notch to ssecond from the top

The old raptor absolutely rocks from 1st to 5th and from 0 to 9000rpm

it pulls buddy just bought a raptor 700..stock...and i absolutley killed him....
cant wait to see him with a pipe and intake...and do it again

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post #29 of 300 (permalink) Old 04-28-2007, 01:36 PM
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Re: Jetting that works, collecting info

Location: Clearwater Florida
Elevation: 60' above sea level
Jet Type: Mikuni, DJ needles, DJ Springs
Intake Mods: Prodesign Foam kit w/ billet adapter w/o airbox lid
Exhaust Mods: Yoshimura RS3 Comp Full System
Porting/Motor Mods: n/a
Other: Crankcase Breather #UP123

Pilots: 27.5
Fuel Screws: 2 3/4 turns out
Needles: 3rd clip from top
Mains: 160/165 L/R

A Little Wider, A Little Lower, A Little Faster.

If your friends don't ride... You need new friends.

Last edited by MPTonyT; 05-12-2009 at 10:25 AM.
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post #30 of 300 (permalink) Old 05-01-2007, 08:58 PM
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Re: Jetting that works, collecting info

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?
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