Z1000 Low RPM Sputter?

quiXilver · 02-09-2008

My friend just bought an '03 Z1000 and when you blip the throttle from idle, it sputters and hesitates untill it gets past 2k rpm. Same thing happens if you are in a low gear going around a corner at low rpm and you try to give it throttle it just bucks and hesistates really bad untill you get past a certain rpm. Once it gets past that it goes like hell and runs perfect.

Anyone have an idea on what could be causing this? The bike has only 4,500 miles on it and it great condition otherwise. Thanks for the help!

eidian · 02-09-2008

Any mods to the bike...like an aftermarket exhaust? An '03 with only 4,500 miles? Great find!...but how long has it been sitting?

quiXilver · 02-09-2008

Quote:

Originally Posted by eidian

Any mods to the bike...like an aftermarket exhaust? An '03 with only 4,500 miles? Great find!...but how long has it been sitting?

It was also only $5,100 cash out the door. Completely stock. It's most likely been sitting for a while...

CKRider · 02-09-2008

I would turn my attention to the spark plugs for starters...

quiXilver · 02-11-2008

Quote:

Originally Posted by CKRider

I would turn my attention to the spark plugs for starters...

Yea, I think that's what he's going to do. Too bad I've heard it's like a 2 hr job. Take off the thermostat or drop the motor lol.

MR.S7 · 02-12-2008

i might go for injection checking and/or cdi.

most probably injection..
a good ultrasound cleaning of inyector will fix it.

daemon · 02-12-2008

Quote:

Originally Posted by quiXilver

Yea, I think that's what he's going to do. Too bad I've heard it's like a 2 hr job. Take off the thermostat or drop the motor lol.

i've yet to even attempt to do my own.
but i will agree that the bike may have been sitting for awhile and the problem will most likely be in the plugs or F.I.
if your friend has not started the mod process...keep him away from the guys on riderforums.
the bike will never look the same again.

I KNOW

quiXilver · 02-12-2008

Quote:

Originally Posted by daemon

i've yet to even attempt to do my own.
but i will agree that the bike may have been sitting for awhile and the problem will most likely be in the plugs or F.I.
if your friend has not started the mod process...keep him away from the guys on riderforums.
the bike will never look the same again.

I KNOW

I'll let him know, thanks.

What's CDI btw?

eidian · 02-12-2008

Quote:

Originally Posted by quiXilver

I'll let him know, thanks.

What's CDI btw?

CDI: Capacitor Discharge Ignition. You can become an "expert" like the rest of us!

Capacitor discharge ignition - Wikipedia, the free encyclopedia

The has so few miles that I would be suprised if it was the CDI, they tend to be pretty much bullet-proof. Clogged fuel injector maybe?

quiXilver · 02-12-2008

Ok, I'll let him know.

We put FI Cleaner through it...to no avail. Any other way to check and see if the injector is clogged?

Is there anyway to adjust the air/fuel ratio or intake? You can smell gas real bad when it's idling. Like it's running really rich...

Quote:

Originally Posted by eidian

CDI: Capacitor Discharge Ignition. You can become an "expert" like the rest of us!

Capacitor discharge ignition - Wikipedia, the free encyclopedia

The has so few miles that I would be suprised if it was the CDI, they tend to be pretty much bullet-proof. Clogged fuel injector maybe?

GREENISBEST · 02-13-2008

First off you can get numbers 2 & 3 spark plugs out by loosening the stat housing and unplugging the associated connectors around it saves dropping the coolant, It's a jiggle but can be done.

I've found a surprising amount of low mileage Z1000's that have the Throttle bodies go out of Synchronization causing them to stumble at low revs.

I would check to make sure you have no air leaks which would cause a lean mixture that the ECU would compensate for by adding extra fuel.

Also check (Or get checked) the Throttle position sensor output voltage as this will cause your symptoms if it's out of range..

Poor Fuel can also cause problems, On occasion you can pick up some Water at the Pumps which is for the most part non combustable

quiXilver · 02-14-2008

Hey guys, we managed to get the spark plugs out by unbolting the tank, maneuvering it around accordingly, and using the little bend tool that came with the bike. It's runs 110% better now, it's all fixed! Thanks for the suggestions!

02-09-2008	#1 (permalink)
quiXilver Wannabe Join Date: Oct 2006 Location: Sebring, FL Posts: 10	Z1000 Low RPM Sputter? My friend just bought an '03 Z1000 and when you blip the throttle from idle, it sputters and hesitates untill it gets past 2k rpm. Same thing happens if you are in a low gear going around a corner at low rpm and you try to give it throttle it just bucks and hesistates really bad untill you get past a certain rpm. Once it gets past that it goes like hell and runs perfect. Anyone have an idea on what could be causing this? The bike has only 4,500 miles on it and it great condition otherwise. Thanks for the help!

02-09-2008	#2 (permalink)
eidian Black is faster, right? Forum Supporter Join Date: Jun 2006 Location: Buena Park, CA Posts: 2,840	Any mods to the bike...like an aftermarket exhaust? An '03 with only 4,500 miles? Great find!...but how long has it been sitting? __________________ '07 black Z1000: Power Bronze/Projekt D/EYI Designs/Leo Vince/Puig/Galfer/T1Concepts

02-09-2008	#4 (permalink)
CKRider gonna get a 10 BTK Expert Join Date: Jan 2008 Location: louisiana Posts: 487	I would turn my attention to the spark plugs for starters... __________________ 00 *Ninja* 250R -Kawi-Green!! TheEvolutionofDance myspace facebook

02-13-2008	#11 (permalink)
GREENISBEST Honest it wern't me !! Extreme Forum Supporter Join Date: Nov 2006 Location: Northants UK Posts: 1,797	First off you can get numbers 2 & 3 spark plugs out by loosening the stat housing and unplugging the associated connectors around it saves dropping the coolant, It's a jiggle but can be done. I've found a surprising amount of low mileage Z1000's that have the Throttle bodies go out of Synchronization causing them to stumble at low revs. I would check to make sure you have no air leaks which would cause a lean mixture that the ECU would compensate for by adding extra fuel. Also check (Or get checked) the Throttle position sensor output voltage as this will cause your symptoms if it's out of range.. Poor Fuel can also cause problems, On occasion you can pick up some Water at the Pumps which is for the most part non combustable __________________ END OF MESSAGE !

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02-12-2008	#6 (permalink)
MR.S7 Way Too Much Free Time BTK Expert Join Date: Oct 2006 Location: Ecuador Posts: 1,477	i might go for injection checking and/or cdi. most probably injection.. a good ultrasound cleaning of inyector will fix it.

02-14-2008	#12 (permalink)
quiXilver Wannabe Join Date: Oct 2006 Location: Sebring, FL Posts: 10	Hey guys, we managed to get the spark plugs out by unbolting the tank, maneuvering it around accordingly, and using the little bend tool that came with the bike. It's runs 110% better now, it's all fixed! Thanks for the suggestions!

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