Tuning/Jerk After WOT

TuckerHardRide · 01-28-2012, 11:50 AM

So here it is guys i have a question with my FCR. Fires right up, one turn over, no choke. Sound great right? Well i was just going up and down the street just to get a feel for it and I've noticed after WOT and i let off the gas to try to maintain that speed (not letting off so the throttle snaps back) It has a quick jerk and hesitation before it will settle and continue at that speed. It's like after it dumps the fuel in it has a transition period before a different jet kicks in. Is that a simple fix with the QS3, or something else?

The closest thing i found to it was this.
Deceleration Stumble
It only says about going back down to idle not maintaining the speed if i'm correct. I wouldn't think i'm lean but i really haven't checked where the needle is.

jasmf24 · 01-28-2012, 10:04 PM

Whats your jetting specs, needle, an elevation?

biggiej42 · 01-28-2012, 11:15 PM

I wonder if your petcock is keeping up? How long at wot? What's the qs3 set at?

TuckerHardRide · 01-31-2012, 07:26 PM

Needle is on 4th clip. Qs3 is turned all the way in. How many turn should I have the qs3 out?

Update: Put needle 3rd clip from bottom and qs3 out 2 turns. i will test it out tomorrow.

Pulido221 · 01-31-2012, 09:40 PM

What petcok you using raptor, stock on prime? Main jet, pilot sizes? BTW, let the PITA tuning begin lol! I almost jumped off a bridge tuning the one I had haha.

TuckerHardRide · 01-31-2012, 09:51 PM

Quote:

Originally Posted by Pulido221

What petcok you using raptor, stock on prime? Main jet, pilot sizes? BTW, let the PITA tuning begin lol! I almost jumped off a bridge tuning the one I had haha.

Stock on prime (I ordered a raptor one)
Main 175
Pilot 45
2.5 turns out
Needle third clip from bottom
QS3 2 turns out

jasmf24 · 01-31-2012, 10:26 PM

The Raptor petcock may fix it. If not, I'd find out what needle is in it, make sure there are no intake leaks, clean it with compressed air and carb cleaner, and verify its assembled correctly.

TuckerHardRide · 01-31-2012, 10:30 PM

Quote:

Originally Posted by jasmf24

The Raptor petcock may fix it. If not, I'd find out what needle is in it, make sure there are no intake leaks, clean it with compressed air and carb cleaner, and verify its assembled correctly.

I don't think the fuel getting to it is the problem. I'm just getting the raptor petcock because its a good mod to do if a problem occurs in the future. The needle that is in it has 8 clip spots so i don't know what type it is but it is adjustable. I'll check for any leaks tomorrow with carb cleaner.

The specs i just posted are the updated. I adjusted the needle one clip and qs3 turns.

Hughesc99 · 01-31-2012, 10:47 PM

Don't spray carb cleaner down the intake with it running.... Or at all for that matter. You can ruin your seals that way and have bigger problems.

TuckerHardRide · 01-31-2012, 10:58 PM

Quote:

Originally Posted by Hughesc99

Don't spray carb cleaner down the intake with it running.... Or at all for that matter. You can ruin your seals that way and have bigger problems.

Not down the intake around the boot to see if it is sealed 100% If the RPM's change i know their is a slight leak.

TuckerHardRide · 02-01-2012, 05:16 PM

Anyone else have their air fuel mixture screw get loose? And Biggie with the quiet core in do you experience a bog to WOT? Or a stumble from 1/2 to WOT?

biggiej42 · 02-01-2012, 06:35 PM

No issues here, with either the quiet core or open.

TuckerHardRide · 02-01-2012, 06:57 PM

Quote:

Originally Posted by biggiej42

No issues here, with either the quiet core or open.

Interesting, maybe the QS3 loosened a tad bit. I was riding with the air screw all the way out for a bit and that's when i noticed it was stumbling. So i screwed it back in to where it was. But it still stumbles a bit, it only started happening after i put the core in the exhaust. When i had it out earlier it was ripping.

biggiej42 · 02-01-2012, 07:38 PM

You said it's starting fine w/o the choke? maybe drop the pilot down one size?

TuckerHardRide · 02-01-2012, 07:41 PM

It is 2.5 turns out so i could go to 1.5. Also that would keep the needle from falling out.

01-28-2012, 11:50 AM	#1 (permalink)
TuckerHardRide :::Official Spammer::: Join Date: Feb 2008 Location: PA Posts: 3,220	Tuning/Jerk After WOT So here it is guys i have a question with my FCR. Fires right up, one turn over, no choke. Sound great right? Well i was just going up and down the street just to get a feel for it and I've noticed after WOT and i let off the gas to try to maintain that speed (not letting off so the throttle snaps back) It has a quick jerk and hesitation before it will settle and continue at that speed. It's like after it dumps the fuel in it has a transition period before a different jet kicks in. Is that a simple fix with the QS3, or something else? The closest thing i found to it was this. Deceleration Stumble It only says about going back down to idle not maintaining the speed if i'm correct. I wouldn't think i'm lean but i really haven't checked where the needle is. __________________ 2006 LTR450 Engine Mods: Yoshimira Cherry Bomb - RS-5 Full Exhaust - Inspection Plug Choke B/O Nut - Start Button JE Piston Suspension, Steering & Chassis: Flexx Bars w Turner Clamps - Precision Damper - Tag Skid Plate Powermadds - LT Fox Evol w FuelATV A-Arms - Fox Podium Rear Pro Armor Grab Bar - IMS Roll Nerf + Heel + Bumper Misc: DID X-Ring Chain - Sprocket Guard - Frame Guards - ProDesign K/S Hiper Tec 3 - ITP Beadlock Rear Rims Parted Out: 2004 LTZ400 - September 2011 QOTM Last edited by TuckerHardRide; 01-28-2012 at 12:16 PM.

01-28-2012, 10:04 PM	#2 (permalink)
jasmf24 :::KFX 400 Rider::: Join Date: Mar 2011 Location: Pittsburgh Posts: 910	Whats your jetting specs, needle, an elevation? __________________ 2004 KFX400, 12.2:1 Wiseco, HMF full exhaust, FCR-39 (170 M/ 42P/ 40L/ NCVQ, DRZ-E boot w/ compact head-stay), OSHC's, K-W valves w/ drz springs, Dyna Fs NP, Raptor Petcock, Wiseco cam chain, 400ex boot, Oversized clamp on UNI/K&N no lid, DRZ-E Base, DRZ Flywheel, LTR450 Front Shocks, blob-less ProTaper Contour bars (ATV High) w/ hot-start reverse, odi grips, Tusk nerfs, Full skids, 14/40, (R) Holeshot ITP HD (F) Rzr2, Port-N-Polish by me.

01-28-2012, 11:15 PM	#3 (permalink)
biggiej42 :::Official Spammer::: Join Date: Jun 2006 Posts: 3,356	I wonder if your petcock is keeping up? How long at wot? What's the qs3 set at? __________________ 05' Z434 12.5:1CP,Full Yosh TRC,FCR40,175/45,Rat Stack,Dyna Programmable,AMR Coil,KW Valvetrain,536/540 Web's,DID Tchain,PWR Radiator,Raptor petcock,Gunnar Kill,Elka S3 Front+Rear w/link,Roll+1 Stem,GPR Stabilizer,SL Hyd.Clutch,Tag T2,LSR+3 Arms,Burgard+1 Swinger,Quadtech Rad Shrouds,Supersprox 14/40t,UM Air Box,YFZ Calipers,SS Lines,PA Bumper,Asv's,Roll Nerfs/Heels/Pegs,LSR Axcalibar,Douglas G2 Beadlocks/Razr's,Hid,YFZTail,Pwrmadd's,TT Vapor+Dash,CV4's,RickyStator. July 2011 QOTM

01-31-2012, 07:26 PM	#4 (permalink)
TuckerHardRide :::Official Spammer::: Join Date: Feb 2008 Location: PA Posts: 3,220	Needle is on 4th clip. Qs3 is turned all the way in. How many turn should I have the qs3 out? Update: Put needle 3rd clip from bottom and qs3 out 2 turns. i will test it out tomorrow. __________________ 2006 LTR450 Engine Mods: Yoshimira Cherry Bomb - RS-5 Full Exhaust - Inspection Plug Choke B/O Nut - Start Button JE Piston Suspension, Steering & Chassis: Flexx Bars w Turner Clamps - Precision Damper - Tag Skid Plate Powermadds - LT Fox Evol w FuelATV A-Arms - Fox Podium Rear Pro Armor Grab Bar - IMS Roll Nerf + Heel + Bumper Misc: DID X-Ring Chain - Sprocket Guard - Frame Guards - ProDesign K/S Hiper Tec 3 - ITP Beadlock Rear Rims Parted Out: 2004 LTZ400 - September 2011 QOTM Last edited by TuckerHardRide; 01-31-2012 at 08:31 PM.

01-31-2012, 09:40 PM	#5 (permalink)
Pulido221 :::Post Whore::: Join Date: Jul 2010 Location: Fresno, Ca Posts: 2,315	What petcok you using raptor, stock on prime? Main jet, pilot sizes? BTW, let the PITA tuning begin lol! I almost jumped off a bridge tuning the one I had haha. __________________ Houser +2 a arms ( tric trac ) ProArmor nerfs,bump,grab bar Renthal Fat Bars ( magrath ) Houser +2 antivibe steer stem Fox Podium X front shocks TCS MX rear shock ASV unbreakable levers Full Curtis Sparks exhaust Dyno jet kit/FCI intake Old style hot cams Int/Ex ITP GNCC tires +2 GForce hubs Quadtech carbon fiber hood Kfx450R Monster graphic kit 450 BBK 13.1 JE piston KB valves / DRZ springs Mild ported head by me " WEAR A DAMN HELMET "

01-31-2012, 10:26 PM	#7 (permalink)
jasmf24 :::KFX 400 Rider::: Join Date: Mar 2011 Location: Pittsburgh Posts: 910	The Raptor petcock may fix it. If not, I'd find out what needle is in it, make sure there are no intake leaks, clean it with compressed air and carb cleaner, and verify its assembled correctly. __________________ 2004 KFX400, 12.2:1 Wiseco, HMF full exhaust, FCR-39 (170 M/ 42P/ 40L/ NCVQ, DRZ-E boot w/ compact head-stay), OSHC's, K-W valves w/ drz springs, Dyna Fs NP, Raptor Petcock, Wiseco cam chain, 400ex boot, Oversized clamp on UNI/K&N no lid, DRZ-E Base, DRZ Flywheel, LTR450 Front Shocks, blob-less ProTaper Contour bars (ATV High) w/ hot-start reverse, odi grips, Tusk nerfs, Full skids, 14/40, (R) Holeshot ITP HD (F) Rzr2, Port-N-Polish by me.

01-31-2012, 10:47 PM	#9 (permalink)
Hughesc99 :::Post Whore::: Join Date: Aug 2010 Location: Derby, KS Posts: 2,092	Don't spray carb cleaner down the intake with it running.... Or at all for that matter. You can ruin your seals that way and have bigger problems. __________________ 2006 Lt-Z434 Trinity IV Full Exhaust/OSHC/FCR39 w/AP Safety Wired/ Velocity Intake/Odi Rogue Grips/AC Nerfs Factory Suzuki Heel Guards/Durablue Rear Linkage +2+1 A-Arms

02-01-2012, 05:16 PM	#11 (permalink)
TuckerHardRide :::Official Spammer::: Join Date: Feb 2008 Location: PA Posts: 3,220	Anyone else have their air fuel mixture screw get loose? And Biggie with the quiet core in do you experience a bog to WOT? Or a stumble from 1/2 to WOT? __________________ 2006 LTR450 Engine Mods: Yoshimira Cherry Bomb - RS-5 Full Exhaust - Inspection Plug Choke B/O Nut - Start Button JE Piston Suspension, Steering & Chassis: Flexx Bars w Turner Clamps - Precision Damper - Tag Skid Plate Powermadds - LT Fox Evol w FuelATV A-Arms - Fox Podium Rear Pro Armor Grab Bar - IMS Roll Nerf + Heel + Bumper Misc: DID X-Ring Chain - Sprocket Guard - Frame Guards - ProDesign K/S Hiper Tec 3 - ITP Beadlock Rear Rims Parted Out: 2004 LTZ400 - September 2011 QOTM

02-01-2012, 06:35 PM	#12 (permalink)
biggiej42 :::Official Spammer::: Join Date: Jun 2006 Posts: 3,356	No issues here, with either the quiet core or open. __________________ 05' Z434 12.5:1CP,Full Yosh TRC,FCR40,175/45,Rat Stack,Dyna Programmable,AMR Coil,KW Valvetrain,536/540 Web's,DID Tchain,PWR Radiator,Raptor petcock,Gunnar Kill,Elka S3 Front+Rear w/link,Roll+1 Stem,GPR Stabilizer,SL Hyd.Clutch,Tag T2,LSR+3 Arms,Burgard+1 Swinger,Quadtech Rad Shrouds,Supersprox 14/40t,UM Air Box,YFZ Calipers,SS Lines,PA Bumper,Asv's,Roll Nerfs/Heels/Pegs,LSR Axcalibar,Douglas G2 Beadlocks/Razr's,Hid,YFZTail,Pwrmadd's,TT Vapor+Dash,CV4's,RickyStator. July 2011 QOTM

02-01-2012, 07:38 PM	#14 (permalink)
biggiej42 :::Official Spammer::: Join Date: Jun 2006 Posts: 3,356	You said it's starting fine w/o the choke? maybe drop the pilot down one size? __________________ 05' Z434 12.5:1CP,Full Yosh TRC,FCR40,175/45,Rat Stack,Dyna Programmable,AMR Coil,KW Valvetrain,536/540 Web's,DID Tchain,PWR Radiator,Raptor petcock,Gunnar Kill,Elka S3 Front+Rear w/link,Roll+1 Stem,GPR Stabilizer,SL Hyd.Clutch,Tag T2,LSR+3 Arms,Burgard+1 Swinger,Quadtech Rad Shrouds,Supersprox 14/40t,UM Air Box,YFZ Calipers,SS Lines,PA Bumper,Asv's,Roll Nerfs/Heels/Pegs,LSR Axcalibar,Douglas G2 Beadlocks/Razr's,Hid,YFZTail,Pwrmadd's,TT Vapor+Dash,CV4's,RickyStator. July 2011 QOTM

02-01-2012, 07:41 PM	#15 (permalink)
TuckerHardRide :::Official Spammer::: Join Date: Feb 2008 Location: PA Posts: 3,220	It is 2.5 turns out so i could go to 1.5. Also that would keep the needle from falling out. __________________ 2006 LTR450 Engine Mods: Yoshimira Cherry Bomb - RS-5 Full Exhaust - Inspection Plug Choke B/O Nut - Start Button JE Piston Suspension, Steering & Chassis: Flexx Bars w Turner Clamps - Precision Damper - Tag Skid Plate Powermadds - LT Fox Evol w FuelATV A-Arms - Fox Podium Rear Pro Armor Grab Bar - IMS Roll Nerf + Heel + Bumper Misc: DID X-Ring Chain - Sprocket Guard - Frame Guards - ProDesign K/S Hiper Tec 3 - ITP Beadlock Rear Rims Parted Out: 2004 LTZ400 - September 2011 QOTM

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