Z400 Hop-up Questions/recommendations

kentuckycat · 09-19-2005, 07:03 PM

Instead of cluttering up the FAQ section, you can ask your hop-up questions here.
Thanx!

Deviousfred · 09-19-2005, 11:30 PM

thanks for the thread. sorry about the clutter, but I was directed to that thread by another member.

I have an 06 KFX. I just installed a Full HMF system, and a Pro-Power up kit that includes K&N, billet adapter, and outerwear, I sit between 3800-4200ft elev.

w/ that done to it, it idles well, it runs pretty well up to about 3/4 throttle then it just falls on its face (lean I believe.)

From what I've searched and read on the site, I figure up the main jet some and work from there only for these mods and because of how its running. Am I correct in that?

I plan to remove the snorkel, get a better flowing air boot, and get a screen lid. W/ these mods I remember reading I would probably have to play with the jet needle. Am I correct in that?

Anyone think I would have to play with the pilot jet as well?

I have a Dynajet Kit at my disposal that incleds liek 10-12 main jets, an adustable needle, but no pilot jets. anyone know where I can get these?

Xspyder01 · 10-06-2005, 08:34 PM

Quote:

Originally posted by kentuckycat@Sep 19 2005, 07:03 PM
Instead of cluttering up the FAQ section, you can ask your hop-up questions here.
Thanx!
<div align='right'>

[/quote]

My KFX is 2 years old... and I guess I sorta beat it pretty good.... but anyways, I was riding up in Tamaqua on one really hot day (like 90 degrees +) and we were going through some rocky sections of trail for a while and I was in 1st or 2nd gear most of the time. Ever since then my quad has been making a loud ticking noise, sort of like maybe the valves ticking or timing chain or something?!? I dunno, I'm not a real big motor head. But has anyone else run into this or know what it might be? I'm supposed to race a harescramble this Sundayand I'm really itching to start racing but I don't wanna blow my bike up. Reply or email me at XSPYDER01@aol.com. THANKS DUDES!!!!

kj_kfx400 · 10-06-2005, 10:14 PM

Since you are speculating that it might be the cam chain or valves I am assuming you have eliminated the drive train and that the ticking occurs in neutral and increases its frequency when the engine rpm is increased, correct me if I am wrong on this.

I would say you are probably right with your guess. You should remove your cam chain tensioner as per the service manual and make sure you have at least 3 clicks left. You should also take off the valve cover and make sure your valve clearances are within specifications.

Another thought, have you removed the flywheel and replaced the bolts as per this thread?

walt227 · 10-11-2005, 08:37 AM

Hi, I'm new to this forum and so far have found it very helpful. Thanks to all for sharing their knowledge. I just bought an 03 Z and have a couple questions:

I ordered an HMF slipon which comes with "required jets". I plan on running a UNI filter and EHS lid. What main do you reccomend? Is the pilot screw the same thing as the A/F screw and if so how many turns out does it need to be? What is it set to by default? (2.5?)

I live in central NC at approx 900ft elevation. Any input would be GREATLY appreciated!

THANKS EVERYONE!

bigairx400 · 10-16-2005, 01:57 AM

Quote:

Originally posted by kentuckycat@Sep 19 2005, 06:03 PM
Instead of cluttering up the FAQ section, you can ask your hop-up questions here.
Thanx!
<div align='right'>

[/quote]

any jetting suggestions for my quad would be appreciated. runs super right up to the point when you want to shift then is sputters out until you let off throttle. 190 main and on the fifth rung down on the needle. is there a lord of jetting around???

zrider#1 · 11-14-2005, 12:18 PM

I was just wondering if anybody here has run there z with the spark arrestor cut of because i was thinking of doing that, before i get my full yosh exhaust, to gain a little power?

turfrooster · 11-30-2005, 07:31 PM

Quote:

Originally posted by zrider#1@Nov 14 2005, 09:18 AM
I was just wondering if anybody here has run there z with the spark arrestor cut of because i was thinking of doing that, before i get my full yosh exhaust, to gain a little power?
<div align='right'>

[/quote]
I wouldnt. Mine is off and it doesnt run very good. I think it has overheated and caused motor damage.

slap01 · 01-26-2006, 09:45 AM

Can someone please help me i just put in web cams and my motor wont run. it did run for a while but then it got to the point were it wouldnt run at all.

defiZ400 · 01-28-2006, 04:23 PM

You guys are my last resort, I don't know what else to do...
Please help me with my 2005 Z400

I went riding the other day, and the bike ran great as usual, no proiblems at all. After the ride I washed it and stored it away. The next day, I went to ride again, I started it to warm it up and I let it iddle (started on the first try as usual). After a few minutes the bike stalled and never started again!
I have spark, I have gas, air is not an issue. I took the carb apart and cleaned it, it was a little dirty, but nothing staggering.
Everytime I took the bike a part to check something else and then put it back together, it would again start on the first try, but then again stalling after a few minutes and never starting again. If I try to work the throttle to keep it from stalling, it breaks up real bad, sputters and when I try to start it again it back fires. This has led me to the conclusion that once the bike gets hot it doesnt want to run. ( the fan works by the way)
So now i'm thinking the stator went bad, right??? WRONG!, I just put a brand new stator in it, and it still does the same thing again.
I've played with the jetting and carb settings... that does not seem to be the problem.

As far as mods, the bike is an exact replica of Digger Doug Gust's bike from the 2005 season, from tires to hand grips. I love this bike, it is very fast, and i've won plenty of races leading from holeshot to checkerd flag!

I DON'T KNOW WHAT ELSE TO DO... other than tear my hair out!
PLEASE HELP ME!!!
Thanks

Sh0rtZrider · 02-17-2006, 07:54 PM

Quote:

Originally posted by defiZ400@Jan 28 2006, 04:23 PM
You guys are my last resort, I don't know what else to do...
Please help me with my 2005 Z400

I went riding the other day, and the bike ran great as usual, no proiblems at all.Wooter After the ride I washed it and stored it away.Wooter The next day, I went to ride again, I started it to warm it up and I let it iddle (started on the first try as usual).Wooter After a few minutes the bike stalled and never started again!
I have spark, I have gas, air is not an issue.Wooter I took the carb apart and cleaned it, it was a little dirty, but nothing staggering.
Everytime I took the bike a part to check something else and then put it back together, it would again start on the first try, but then again stalling after a few minutes and never starting again.Wooter If I try to work the throttle to keep it from stalling, it breaks up real bad, sputters and when I try to start it again it back fires.Wooter This has led me to the conclusion that once the bike gets hot it doesnt want to run.Wooter ( the fan works by the way)
So now i'm thinking the stator went bad, right??? WRONG!, I just put a brand new stator in it, and it still does the same thing again.
I've played with the jetting and carb settings... that does not seem to be the problem.

As far as mods, the bike is an exact replica of Digger Doug Gust's bike from the 2005 season, from tires to hand grips.Wooter I love this bike, it is very fast, and i've won plenty of races leading from holeshot to checkerd flag!

I DON'T KNOW WHAT ELSE TO DO... other than tear my hair out!
PLEASE HELP ME!!!
Thanks
<div align='right'>

[/quote] Have you checked to make sure your fuel lines arent clogged? Have you checked your magnesium clutch cover to make sure there arent any pieces of metal floating in there clogging up your lines? just a few things that might help, good luck

madness · 02-28-2006, 05:58 AM

Hy guys,
Im brand new to the forum and to the z400 bike.
Can you tell me about the item called "phoenix performance spark arrester"?
Does it do any good (gains power) or its just another sound product?
Should I change on my z400-2005 just mg. cover or also the water pump?
Thanks

LEM1375 · 03-21-2006, 02:52 PM

04 z400 stock engine wb eseries 12 disc full system k&n dynojet kit wb rev box need to talk to someone on a way to jet for trail riding

walt227 · 03-21-2006, 04:19 PM

Quote:

Originally posted by LEM1375@Mar 21 2006, 03:52 PM
04 z400 stock engine wb eseries 12 disc full system k&n dynojet kit wb rev box need to talk to someone on a way to jet for trail riding
<div align='right'>

[/quote]

If you have a DJ kit try a 165 main, needle on the third clip, and 25 pilot w/ 2.5 turns out on the fuel screw.

DJ's numbers dont match Mikuni's for mains---a 165 DJ is equiv to about a 155 Mikuni---

Goooch98 · 03-24-2006, 11:28 PM

I have a water pump leak on my brand new (used) 2003 z400 and have a question about this.. I bought the bike from a shop that told me after the fact that it has a leak and was going to fix it no charge. When I persisted in finding out more about it I found that the leak also bled into my oil. So now that I know that I had anitfreeze in my oil (the mechanic said not a whole lot) Im wondering if Im going to have to look into a new crankcase bearing?? Is this a typical thing with the z's?? And should I try to figure a way to have the shop that sold me the bike to take it back???I've been told this is the sight to go to when it comes this type of question. please help. Thankyou

09-19-2005, 11:30 PM	#2 (permalink)
Deviousfred :::Mini LT80 Rider::: Join Date: Aug 2005 Location: El Paso, Texas Posts: 255	thanks for the thread. sorry about the clutter, but I was directed to that thread by another member. I have an 06 KFX. I just installed a Full HMF system, and a Pro-Power up kit that includes K&N, billet adapter, and outerwear, I sit between 3800-4200ft elev. w/ that done to it, it idles well, it runs pretty well up to about 3/4 throttle then it just falls on its face (lean I believe.) From what I've searched and read on the site, I figure up the main jet some and work from there only for these mods and because of how its running. Am I correct in that? I plan to remove the snorkel, get a better flowing air boot, and get a screen lid. W/ these mods I remember reading I would probably have to play with the jet needle. Am I correct in that? Anyone think I would have to play with the pilot jet as well? I have a Dynajet Kit at my disposal that incleds liek 10-12 main jets, an adustable needle, but no pilot jets. anyone know where I can get these? __________________ 2005 KX250F 2001 YZ125 2005 RM125 2006 KFX400 Looking for another quad.....

10-06-2005, 10:14 PM	#4 (permalink)
kj_kfx400 :::Z-250 Rider::: Join Date: Sep 2004 Location: West Jordan, UT Posts: 475	Since you are speculating that it might be the cam chain or valves I am assuming you have eliminated the drive train and that the ticking occurs in neutral and increases its frequency when the engine rpm is increased, correct me if I am wrong on this. I would say you are probably right with your guess. You should remove your cam chain tensioner as per the service manual and make sure you have at least 3 clicks left. You should also take off the valve cover and make sure your valve clearances are within specifications. Another thought, have you removed the flywheel and replaced the bolts as per this thread? __________________ West Jordan, Utah 2003 KFX 440 - wiseco 440 (12.5:1), drz base gasket, drz valve springs, d.i.d. hd cam chain, dyna fs ignition, 450r carb, esr airbox eliminator, stage 2 hotcams, lrd full exhaust, tcs revalved 450r shocks, alba pro-comp +2 a-arms, g-force +2+2 axle, holeshots, ws swingarm bolt, tusk nerf bars, tag handle bars

10-11-2005, 08:37 AM	#5 (permalink)
walt227 :::Z-250 Rider::: Join Date: Oct 2005 Location: Greensboro - NC Posts: 453	Hi, I'm new to this forum and so far have found it very helpful. Thanks to all for sharing their knowledge. I just bought an 03 Z and have a couple questions: I ordered an HMF slipon which comes with "required jets". I plan on running a UNI filter and EHS lid. What main do you reccomend? Is the pilot screw the same thing as the A/F screw and if so how many turns out does it need to be? What is it set to by default? (2.5?) I live in central NC at approx 900ft elevation. Any input would be GREATLY appreciated! THANKS EVERYONE! __________________ 08 Z400 Limited--Two Brothers, K&N, 13T, AC Front Bumper, Nerfs, EBC's, 170main, Open Airbox It beats the hell outta Tuffy everytime...

11-14-2005, 12:18 PM	#7 (permalink)
zrider#1 :::Z-250 Rider::: Join Date: Nov 2005 Location: drayton valley AB Posts: 441	I was just wondering if anybody here has run there z with the spark arrestor cut of because i was thinking of doing that, before i get my full yosh exhaust, to gain a little power? __________________ 07 ltr450~mx #909 yoshimura Twin Air Kenda Claw MXR/ Holeshot MXR4, 13,14 -38 pro taper Riverside graphics Pro-armor Blingstar AC ITP TCS Hiper EBC

01-26-2006, 09:45 AM	#9 (permalink)
slap01 :::Rookie Rider::: Join Date: Aug 2005 Location: PA Posts: 39	Can someone please help me i just put in web cams and my motor wont run. it did run for a while but then it got to the point were it wouldnt run at all. __________________ 03 kfx 450 Gt Thunder 450 kit 13:1 piston 110 octane Edlebrock Carb Web Stage 2 cams Kibble White Valves Port and Polish Denton Stablizer asr+3 Wave rotors Blingstar Bumper pep lt fully ajustable ECA Case Saver G-force axle Big Gun Rev Box Hmf full Exhaust Lsr Block off Suzuki Nerfs Houser stem Tag Fat Bars Douglas Beadlocks all around Esr airbox eliminator Pro armor Kill switch Custom Designs Seat Cover Maier Hood RPM sub frame Lonstare Gussetted frame

09-19-2005, 07:03 PM	#1 (permalink)
kentuckycat :::Official Spammer::: Join Date: Jul 2002 Location: Simpsonville, Kentucky Posts: 3,194	Instead of cluttering up the FAQ section, you can ask your hop-up questions here. Thanx!

01-28-2006, 04:23 PM	#10 (permalink)
defiZ400 :::Rookie Rider::: Join Date: Jan 2006 Posts: 4	You guys are my last resort, I don't know what else to do... Please help me with my 2005 Z400 I went riding the other day, and the bike ran great as usual, no proiblems at all. After the ride I washed it and stored it away. The next day, I went to ride again, I started it to warm it up and I let it iddle (started on the first try as usual). After a few minutes the bike stalled and never started again! I have spark, I have gas, air is not an issue. I took the carb apart and cleaned it, it was a little dirty, but nothing staggering. Everytime I took the bike a part to check something else and then put it back together, it would again start on the first try, but then again stalling after a few minutes and never starting again. If I try to work the throttle to keep it from stalling, it breaks up real bad, sputters and when I try to start it again it back fires. This has led me to the conclusion that once the bike gets hot it doesnt want to run. ( the fan works by the way) So now i'm thinking the stator went bad, right??? WRONG!, I just put a brand new stator in it, and it still does the same thing again. I've played with the jetting and carb settings... that does not seem to be the problem. As far as mods, the bike is an exact replica of Digger Doug Gust's bike from the 2005 season, from tires to hand grips. I love this bike, it is very fast, and i've won plenty of races leading from holeshot to checkerd flag! I DON'T KNOW WHAT ELSE TO DO... other than tear my hair out! PLEASE HELP ME!!! Thanks

02-28-2006, 05:58 AM	#12 (permalink)
madness :::Rookie Rider::: Join Date: Feb 2006 Posts: 1	Hy guys, Im brand new to the forum and to the z400 bike. Can you tell me about the item called "phoenix performance spark arrester"? Does it do any good (gains power) or its just another sound product? Should I change on my z400-2005 just mg. cover or also the water pump? Thanks

03-21-2006, 02:52 PM	#13 (permalink)
LEM1375 :::Rookie Rider::: Join Date: Mar 2006 Posts: 1	04 z400 stock engine wb eseries 12 disc full system k&n dynojet kit wb rev box need to talk to someone on a way to jet for trail riding

03-24-2006, 11:28 PM	#15 (permalink)
Goooch98 :::Rookie Rider::: Join Date: Mar 2006 Posts: 2	I have a water pump leak on my brand new (used) 2003 z400 and have a question about this.. I bought the bike from a shop that told me after the fact that it has a leak and was going to fix it no charge. When I persisted in finding out more about it I found that the leak also bled into my oil. So now that I know that I had anitfreeze in my oil (the mechanic said not a whole lot) Im wondering if Im going to have to look into a new crankcase bearing?? Is this a typical thing with the z's?? And should I try to figure a way to have the shop that sold me the bike to take it back???I've been told this is the sight to go to when it comes this type of question. please help. Thankyou

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