36mm Carb Jetting

HEATHEN 730 · 01-12-2008, 02:15 PM

Searching for who runs what as far as jetting goes is beginning to be a pain. You cannot use "36" in the search. So, can we just have those that run 36's on big bores list their engine combo and jet sizes.

I was advised to run certain sized jets with my combo, but the quad would run like turd after 1/2 throttle. I had to drop 28 sizes to get it to run correct. No popping what-so-ever at this point. Plugs look a little sooty, described as a lean condition by another member. I'm now at 132/135.

So, please list your engine combo, carb/filter/intake set ups, exhaust, ignition, elevation, and your jetting. Advise if your jetting was the result of the LM1 or dyno tune.

FPS 730
Ported
Trail Cams (1st Design)
Muzzy Shortened
Dyna CDI
36's w/Stock Pilots
Stock Intakes
GYTR w/Outerwear
2 Shims Per Needle
132/135 @900 ft

brute730 · 01-12-2008, 02:19 PM

port the boost

Eforce13 · 01-12-2008, 02:20 PM

FPS800
Ported Heads w/stock size valves
New Trail/Race Cams
AMR Stage 3 CDI
Regular Muzzy
Keihin 36mm F4 Carbs
Factory Pro Needles (richer Mid range)
K&N Air Filter (K&N part# RU-4720)
148F-150R Keihin mains & #42 pilots w/stock intakes and 93 oct fuel (62.5 RWHP)
175F-178R Keihin mains & #45 pilots w/UPP 36mm MS intakes and U4.2 fuel (64.5 RWHP w/170-172 mains, a little lean)
200' elevation
Dyno tuned @ Wicked Motorsports & LC1 A/f meter

**asnowmobiler** · 01-12-2008, 02:34 PM

My engine details are in my sig.
I'm running 142/145 and is running rich on my LM1 and John's Dyno. I'm still waiting for jets,it's been 6 weeks

The engine is now apart and getting upgraded

**OHVFORCE** · 01-12-2008, 02:35 PM

When I had the fst 715 with 36mm carbs I had 42 pilots 2 shims on the needles which is stock f4 shims. that measures out to .030 148 front 145 rear mains. it was around 45 deg outside when I was at the last drag race I went to. By the way when Glenn tore the motor down it was a tad lean. I have a fast meter that I had it tuned with back in the summer when I put the 36's on in the summer I was 145 front and 142 rear on the mains.

fst 715
stage three cams
stock boots
no head porting
900 ft elevation
no air box
k/n filters
outwears cover
muzzy pro pipe
100 octane turbo blue unleaded
fst/white bros cdi

**asnowmobiler** · 01-12-2008, 02:52 PM

Vader's stock engine is the only one that I ever heard of that ran better with a smaller rear main jet.
I never looked at what pilot jets came with the carbs,the needles that they have are adjustable and they are set one groove up from the bottom.

**PIPO** · 01-12-2008, 03:23 PM

FST 715
Stage 3 cams
AMR porting
Stock intakes
UNI Pod filters
Muzzy Pro
FST CDI
42 Pilot's
no shimmed needles
138/140 93 octane 142/145 U4.2 race fuel 157/160 megaphone 93 octane
tuned by TTD AKA PIPO

**z-mann** · 01-12-2008, 04:33 PM

I have no idea wtf is going on with the 764... but, I tried to run 165 front and rear today.... it was a turd. I went back to 172 front and 175 rear... ran loads better... Went up to a 178 front and 180 rear and ran just as good ir not better. This was racing confirmed.

**asnowmobiler** · 01-12-2008, 05:57 PM

Maybe the longer stroke has something to do with that

gomerkfx700 · 01-12-2008, 11:01 PM

730cc
proted heads stock valves
cwr 450 lift cams
big gun rev box
drag pipe
stock unported intake boots
42 piolets
130-135 jets

i believe the reason for so many diffrant jettings are the carbs not all have the same type of 36mm carbs and not all have the same needles so it kinda makes it a guessing game

01-12-2008, 02:15 PM	#1
HEATHEN 730 Senior Member Feedback Score: 0 reviews Join Date: Jun 2004 Location: Michigan Posts: 7,579 (0)	Searching for who runs what as far as jetting goes is beginning to be a pain. You cannot use "36" in the search. So, can we just have those that run 36's on big bores list their engine combo and jet sizes. I was advised to run certain sized jets with my combo, but the quad would run like turd after 1/2 throttle. I had to drop 28 sizes to get it to run correct. No popping what-so-ever at this point. Plugs look a little sooty, described as a lean condition by another member. I'm now at 132/135. So, please list your engine combo, carb/filter/intake set ups, exhaust, ignition, elevation, and your jetting. Advise if your jetting was the result of the LM1 or dyno tune. FPS 730 Ported Trail Cams (1st Design) Muzzy Shortened Dyna CDI 36's w/Stock Pilots Stock Intakes GYTR w/Outerwear 2 Shims Per Needle 132/135 @900 ft __________________ 2004 KFX730 2003 Predator 90

01-12-2008, 02:19 PM	#2
brute730 Senior Member Feedback Score: 0 reviews Join Date: Jul 2007 Posts: 271 (0)	port the boost __________________ 820 41 fcr lte dyna

01-12-2008, 02:20 PM	#3
Eforce13 Senior Member Feedback Score: 0 reviews Join Date: Jan 2006 Location: Haughton, LA Posts: 3,500 (0)	FPS800 Ported Heads w/stock size valves New Trail/Race Cams AMR Stage 3 CDI Regular Muzzy Keihin 36mm F4 Carbs Factory Pro Needles (richer Mid range) K&N Air Filter (K&N part# RU-4720) 148F-150R Keihin mains & #42 pilots w/stock intakes and 93 oct fuel (62.5 RWHP) 175F-178R Keihin mains & #45 pilots w/UPP 36mm MS intakes and U4.2 fuel (64.5 RWHP w/170-172 mains, a little lean) 200' elevation Dyno tuned @ Wicked Motorsports & LC1 A/f meter __________________ My Marble White V: K&N filters w/Outerwear, AMR CDI, AMR Racing coils, Dalton OR/BL Spring, VFJ stage 2 Clutch , DPK 58g weights, Titanium Clutch cover bolts, Muzzy Exhaust - Jet-Hot Extreme Coated, PRM Desert Grab, Kawie Front Bumper, IMS Foot Pegs & Heel Guards, AC Nerf Bars, Maier CF Scoop Hood, Kawie Gripper Seat Cover, Royal Purple 15-W40 Motor Oil, ESR Temp Gauge, Crankcase Vent Mod, Fluidyne Radiator, Two Aluminum In-Line Coolers, LED Tail Light, Precision steering stabilizer, Maxxis Razr 2's on Black C-Series rims, 24" Extremes 9 Paddle & 21" Buffed Mohawks on Polished C-Series rims, 22" Innova Racers (rims undecided), ASR SS +2" Brake Lines, ASR +2" A-Arms & Tie Rods, All Ball's Racing Tie Rod End's, Durablue 2"+2" Eliminator Axle, G-Force +3.5" Extended Hubs, Houser Black +2" steering stem & Anti-vibe Fat Bar Mounts, Black Pro Taper Couture Fat Bars, Elka's Race Front & Rear, FPS800 BBK, Nikasil cylinders, Fully ported, Trail/Race cams, 36mm F4 carbs , UPP 36mm Intakes, Braided Fuel lines, Black & Silver IMS Powermadd Star Hand Guards, LC1 Digital Air/Fuel Gauge, Polished Shorty Shifter, Moose Billet Throttle, Ven's +4" Swing arm Ext., Everything powdercoated Black & White, Dyno Tuned @ 64.5 RWHP

01-12-2008, 02:35 PM	#5
OHVFORCE Premium Member Feedback Score: 5 reviews Join Date: May 2006 Posts: 4,705 (0)	When I had the fst 715 with 36mm carbs I had 42 pilots 2 shims on the needles which is stock f4 shims. that measures out to .030 148 front 145 rear mains. it was around 45 deg outside when I was at the last drag race I went to. By the way when Glenn tore the motor down it was a tad lean. I have a fast meter that I had it tuned with back in the summer when I put the 36's on in the summer I was 145 front and 142 rear on the mains. fst 715 stage three cams stock boots no head porting 900 ft elevation no air box k/n filters outwears cover muzzy pro pipe 100 octane turbo blue unleaded fst/white bros cdi __________________ "The Untouchable"

01-12-2008, 02:52 PM	#6
asnowmobiler Premium Member Feedback Score: 4 reviews Join Date: Sep 2003 Location: Western Poconos (SOON) Posts: 14,250 (20)	Vader's stock engine is the only one that I ever heard of that ran better with a smaller rear main jet. I never looked at what pilot jets came with the carbs,the needles that they have are adjustable and they are set one groove up from the bottom. __________________ Team Green 04 V-Prairie, Ported AMR 730,XX cams,Digatron gauges,VFJ custom clutch with EBC bearing removed,V-force gears,Dirty South +5 swingarm,39mm carbs, Looney Tuned Exhaust, programmable Dyna,front Elkas,30 shot of Boon,Brute Force Flywheel,Flexx bars,Rox Risers,ODI grips,ECT. AMR 330 347 6800

01-12-2008, 02:34 PM	#4
asnowmobiler Premium Member Feedback Score: 4 reviews Join Date: Sep 2003 Location: Western Poconos (SOON) Posts: 14,250 (20)	My engine details are in my sig. I'm running 142/145 and is running rich on my LM1 and John's Dyno. I'm still waiting for jets,it's been 6 weeks The engine is now apart and getting upgraded __________________ Team Green 04 V-Prairie, Ported AMR 730,XX cams,Digatron gauges,VFJ custom clutch with EBC bearing removed,V-force gears,Dirty South +5 swingarm,39mm carbs, Looney Tuned Exhaust, programmable Dyna,front Elkas,30 shot of Boon,Brute Force Flywheel,Flexx bars,Rox Risers,ODI grips,ECT. AMR 330 347 6800

01-12-2008, 03:23 PM	#7
PIPO Premium Member Feedback Score: 10 reviews Join Date: Dec 2006 Location: Augusta, GA Posts: 5,675 (0)	FST 715 Stage 3 cams AMR porting Stock intakes UNI Pod filters Muzzy Pro FST CDI 42 Pilot's no shimmed needles 138/140 93 octane 142/145 U4.2 race fuel 157/160 megaphone 93 octane tuned by TTD AKA PIPO __________________ KFX 798 AMR/ASR/Diamond/DG/Dynatek/Elka/Falicon/GT Thunder/JH Clutch/Muzzy Super Pro/WEB YFZ 450 CP/CCP/FCI/Fox Evol DSC/Fox Podium/Hiper/Houser/JD/Nmotion/REM/Team axle 330'-4.6 660'-7.5@85mph 1320'-12.5@93mph 11secs coming soon...all motor baby!

01-12-2008, 04:33 PM	#8
z-mann Premium Member Feedback Score: 1 reviews Join Date: Nov 2003 Location: Semi-Sexy.... Posts: 5,888 (0)	I have no idea wtf is going on with the 764... but, I tried to run 165 front and rear today.... it was a turd. I went back to 172 front and 175 rear... ran loads better... Went up to a 178 front and 180 rear and ran just as good ir not better. This was racing confirmed. __________________ 04 kfx730- Fundy powered 04 kfx764- " " 04 kfx800 chain drive 04 kfx700 stock 04 kfx ? drag frame chain drive 05 Polaris sportman 90 04 Polaris predator 90 03 Polaris predator "troy lee" 90 99 traxter

01-12-2008, 05:57 PM	#9
asnowmobiler Premium Member Feedback Score: 4 reviews Join Date: Sep 2003 Location: Western Poconos (SOON) Posts: 14,250 (20)	Maybe the longer stroke has something to do with that __________________ Team Green 04 V-Prairie, Ported AMR 730,XX cams,Digatron gauges,VFJ custom clutch with EBC bearing removed,V-force gears,Dirty South +5 swingarm,39mm carbs, Looney Tuned Exhaust, programmable Dyna,front Elkas,30 shot of Boon,Brute Force Flywheel,Flexx bars,Rox Risers,ODI grips,ECT. AMR 330 347 6800

01-12-2008, 11:01 PM	#10
gomerkfx700 Senior Member Feedback Score: 1 reviews Join Date: Jul 2005 Posts: 1,121 (0)	730cc proted heads stock valves cwr 450 lift cams big gun rev box drag pipe stock unported intake boots 42 piolets 130-135 jets i believe the reason for so many diffrant jettings are the carbs not all have the same type of 36mm carbs and not all have the same needles so it kinda makes it a guessing game __________________ 2008 brute force black and red high lifter springs for about 1.5" of lift 27" mud light xl's should have gone bigger 2005 kfx700 Project "GRAVE DIGGER" In memory of Jimmy Cox gone 04/06/06 But never Forgotten

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