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1,726 Posts
Discussion Starter #1
Would like to collect the jetting that people are using and know to work well.
With any luck others will be able to find a simillar setup and have a starting point for thier carbs.
A standard format would be easiest to follow.


Elevation and region of the country or world. Including this since humidity levels affect jetting to some degree.

Jet manufacturer,
Dynojet, Mikuni, GYTR, others.

Pipe maunfacturer

Motor mods

Air box mods

Porting........ this is tough since it's hard to compare who has what.

Compresion ratio?


I know I'm missing something in this and assume some editing or starting over may be necessary.

Any thought's on the format or other ideas would be great.
 

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17,058 Posts
Location: Central Michigan
Elevation: 600' above sea level
Jet Type: Mikuni, CT needles
Intake Mods: K&N Pro-flow kit w/o airbox lid
Exhaust Mods: CT w/ 16 discs
Porting/Motor Mods:
Other:

Jetting:
Pilots: 22.5
Fuel Screws: 2.5/3.0 L/R
Needles: 3rd (middle) clip
Mains: 165/170 L/R

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Location: Central Michigan
Elevation: 600' above sea level
Jet Type: Mikuni, CT needles
Intake Mods: K&N Pro-flow kit w/o airbox lid
Exhaust Mods: CT w/ 16 discs
Porting/Motor Mods: Stage 1 Hotcam
Other:


Jetting:
Pilots: 30
Fuel Screws: 1.5 L/R
Needles: 3rd (middle) clip
Mains: 175/180 L/R

Comments: Ice racing conditions necessitated increased idle fuel flow, hence 30 pilots.

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Location: Central Michigan
Elevation: 600' above sea level
Jet Type: Mikuni, CT needles
Intake Mods: K&N Pro-flow kit, no airbox
Exhaust Mods: CT w/ 16 discs
Porting/Motor Mods: Wiseco 11:1 100mm, Stage 2 Hotcam
Other:

Jetting:
Pilots: 30
Fuel Screws: 1.5 L/R
Needles: 4th clip (richer side)
Mains: 185/190 L/R
 

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4 Posts
Location: New York ,bronx
Elevation:100 ft above sea level
Jet Type: Mikuni
Intake Mods: K&N Powerlid, uni prodesign
Exhaust Mods: lrd full exhaust
Porting/Motor Mods:stock
Other: biggun cdi

Jetting:
Pilots: 27.5
Fuel Screws: 2 r,l
Needles: 3rd clip
Mains: 160/165

added stage 1 hot cam increased mains to 170L175R
location new york mods K&N powerlid,lrd full exhaust,biggun cdi,uni prodesign,27.5 piolot 160165 needle 3rd clip
 

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Discussion Starter #4
Location: Wisconsin
Elevation:600 ft above sea level
Jet Type: Mikuni
Intake Mods: K&N drop in, lid had minimal material left to hold filter in pplace
Exhaust Mods: Rossier full exhaust
Porting/Motor Mods:stock bore and piston, minimal porting
Other:

Jetting:
Pilots: 25
Fuel Screws: 2 1/2 r,l
Needles: 3rd clip
Mains: 160/165
 

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211 Posts
location:wisconsin
elevation:600ft above sea level
jet type k&ns

intake mods/k&n with outwears open lid
exaust mods/yoshimara comp complete with header
porting/motor mods:102mm 11to1 wiseco piston
porting and polished carbs and head ,valve grind by janssens kibblewhite spring kit and kibblewhite black diamond valves
stage 2 web cams
other: janssen cdi (1000more rr's)

jetting

pilots22.5
fuel screw 3.5 to 4 l/r
needles :k&n replacements 5thclip l/4th clip r
mains 150l/155r
fuel/ vp c-12
this is what i remember
 

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364 Posts
location: Oregon
elevation:sea level
jet type mikuni

intake mods/k&n with outwears open lid
exaust mods/Alba complete with header and race endcap...megaphone style
porting/motor mods:none



jetting

pilots 27.5
fuel screw 1.5 / 2
needles dynojet middle clip
mains 150l/155r

I do run a bit lean at 200 degrees but thats where the power is
 

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22,016 Posts
Location: Fort Smith, AR
Elevation: 469 feet ASL
Jet Type: Mikuni
Exhaust: Yoshimura RS3 Full system, no spark arrestor.


Intake: Modified factory snorkel with K&N filter, airbox lid in place, K&N Crank case filter
Jets: Mikuni 155 left main, Mikuni 160 right main, Mikuni 22.5 pilot jets
Mixture screw: 2.5 turns left carb, 2.75-3 turns right carb
Needle settings: Factory needle settings

With airbox lid removed/modified with EHS Racing lid

Jets: Mikuni 160 left main, Mikuni 165 right main, Mikuni 22.5 Pilot jets.
Mixture screw 2.5 turns left carb, 2.75-3 right carb
Needle settings: Factory needle settings


~Brian
 

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1,568 Posts
Location: 40 miles S.W. of Cleveland, Ohio
Elevation: 750'-800'
Fuel\air: Stock carbs-(Mikuni')
Average Relative Humidity (%) 65-70

Intake Mods-No lid, no box, custom airfilter shroud (Equivilent of the back half of airbox gone) Twin k&n's, Custom runners (filter to carb), crankcase breather filter.

Exhaust Mods-CT Sonic Full system-16 disks

Motor Mods- none on this one..no porting

Jet kit-stock a/f screws--stock pilots--ct needles--Mikuni mains

Settings A/F screw......Pilots........Needles.......Mains
Summer 2.5-2.75 22.5 3rd 165-170
spring/fall 2.5-2.75 22.5 3rd 170-175
Winter 2.5-3 22.5 3rd-4th 170-175

Thats assuming all temps, pressures, humidities are not unseasonable.
I also run a little richer Air/Fuel mix...around 12.5:1 to 13:1 on full throttle. (My personal preference)
The Spark plug is also one step cooler in summer, and normal in winter..fall..spring
 

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240 Posts
Location: Paguate, New Mexico
Elevation: 6000' above sea level
Jet Type: Dyno Jet, DJ needles
Intake Mods: K&N w/outerwear/no airbox
Exhaust Mods: DMC Afterburner Comp
Porting/Motor Mods:102mm w/12:1 and stage 1 cam
Other:

Jetting:
Pilots: 25
Fuel Screws: 2.5/2.5
Needles: 3rd (middle) clip
Mains: 148/150
 

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584 Posts
Here's where I'm at (works pretty damn good too):

2004 660LE Raptor
720 HR Stroker Kit (10.5:1); Premium Gas
Yoshimura RS-3 Stainless Exhaust w/ largest exhaust tip
Ported & Polished
K&N w/ No Air Lid
12 Tooth Front Sprocket; 22" Rear Tires (Mud Lites)
Aftermarket Ignition (No Rev Limiter & Modified Timing Curve)
Carb Settings:
160/165 DynoJet Main Jets, with DJ Needles also (3rd clip position I think, maybe 4th)
27.5 Pilot Jets
Pilot Screws; 2-1/2 turns for RH Carb, 2 turns out for LH Carb

I have awesome torque with this. I am running a little bit rich at the low end; still some very fine tuning left for the carbs, I think that I need to cut some spark plugs up to finish the fine tuning. I will probably wait until late spring to do this. I am planning to run on Ice this winter if we have enough.


Jeff
 

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176 Posts
'02 660R
Location: Louisville, Ky
Elevation: 449 Feet Above Sea Level
Jets: Mikuni
Exhaust: GYTR carbon fiber slip-on, factory elsewhere
Other Mods: none

Intake: K&N drop-in w/outerwear's, no lid.
Main Jets: Mikuni 155L 160R
Needles: Stock on 3rd clip
Pilots: 30
Pilot screws: 1&1/4 to 1&1/2 turns each
 

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200 Posts
Location: St. Louis, MO.
Elevation: 500' above sea level
Jet Type: Dynojet, DJ needles
Intake Mods: Pro Flow K&N w/o lid
Exhaust Mods: HMF Sport full exhaust
Porting/Motor Mods: None
Other:

Jetting:
Pilots: 22.5
Fuel Screws: 2 3/4L 3 R
Needles: 3rd clip down out of 6
Mains: 165/170 DJs

This was the set up I had on my 05 660. It was VERY FAST for a stocker.
 

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2,786 Posts
Location:phoenix, AZ
Elevation:1200 ft
Jet Type: Mikuni mains and pilots, CT needles
Intake Mods:No box, Pro-flow with K&N air filter
Exhaust Mods: CT Full System, 16 discs (as it comes from CT)
Porting/Motor Mods: None
Other: Crankcase Breather


Jetting
Pilots: 25
Fuel Screws: 2.75 for both
Needles: 3rd Clip
Mains: 170/175 L/R
 

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NEW SETUP, EVEN BETTER

Elevation: Around 100ft
Jet type: Dyno Jet kit stage 2
Intake Mods: No Lid, Pro-deisgn air filter, crank case breather
Exhuast mods: HMF sport series Exhaust pipe, FMF powerbomb header
Porting/motor mods: none
Other: Crankcase Breather

Jetting
Pilots: 25
Fuel Screws: 2.5 turns out
Needles: 3th Clip out of 6
Mains: Dj146 L/Dj 148 R
 

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'01 660R
Location: Louisville, Ky
Elevation: 449 Feet Above Sea Level
Jets: K&N? (Came with Powerlid Kit)
Exhaust: Stock
Other Mods: none

Intake: K&N drop-in w/powerlid.
Main Jets: 155L 175R
Needles: Stock on 5th clip
Pilots: Stock
Pilot screws: 2L to 2 1/2R
 

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298 Posts
portola ca
elevation. 5000ft
main jets 148 150 dyno jet (162/164 mikuni)
needles. 4 down from top.
fuel screw. out 3 2/5 turns
pilots. 27.5
air box. none
exhaust. pro circit full system.
 
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