[Leighroy]

Hey all just after a little help.
I have what a GPZ1100 1981 Model Fuel Injection
I am having trouble with Fouling Plugs not just 1 or 2 but all 4.
They are wet with fuel and will foul if it idels for to long.
Is there any way to adjust the fuel mixture?
I have tried different fuels Premium and Std no difference.
Starting to pull my hair out.
It does use a little oil but I hear that is par for the course.
Any help would be appricated.

 

[A2rider]

Don't know much about them, but you may check and see if your injectors are working properly.

 

[Gpz1100]

stock air box or pods?

if the temp sensor is out it will run rich.
need more info on your set-up-modified or stock?

 

[Leighroy]

it is as stock as a rock except for 4 into 1 exhaust

 

[elr658]

A STOCK air filter with a Kawasaki part number.
NEW spark plug resistor caps.
NGK spark plugs ONLY
NO THROTTLE when starting
Use the fast idle lever
NEW fuel filter
Stuck fuel pressure regulator or stuck return valve.

 

[Gpz1100]

sounds like the temp sensor.

 

[Leighroy]

no signal light window

 

[Leighroy]

how do you test the temp sensor?

 

[Gpz1100]

dunno. i'll look at my manual, see what it says.
what's the whole story? did this one just come out of storage? you the new owner or had it a while and it just started doing this? everything that elr658 mentioned check out?

 

[Gpz1100]

ok. according to the kawasaki manual;
check the engine temp sensor.
ignition switch off.
disconnect lead to sensor.
with an ohmeter, one lead to sensor, the other to chassis ground, ohmeter range set on x 1k, reading of 2.0 - 3.0 anything higher or lower, replace sensor.

also check the air flow meter. (afm)
remove the afm to inspect the flap and potentiometer.
check the air flap.
push the flap from the air filter side. should move free and spring should return flap to closed position. anything else-replace it.
potentiometer inspection of the afm-
ignition switch off.
diconnect 7-pin connector
top of terminal has the two guides, from left to right number terminals 39-36-34-35-33-32-25
with an ohmeter, range set on x 100
one lead on #34-other lead on #35 reading: 250-400
next- one lead on #32-other lead on #33 reading: any value other than 0 or infinity with flap in any position.
any reading on either test not in range, replace the afm.

hope this helps.

 

[ratvespa]

just a long shot, but it could be a fuel pressure regulator going out. if the pressure is high it will be rich all over the place.

 

[Leighroy]

just a long shot, but it could be a fuel pressure regulator going out. if the pressure is high it will be rich all over the place.

Is there any way to test the regulator. Just got a price $250 Aus

and Temp Sensor $131 Aus

 

[Gpz1100]

use a tee and check the fuel pressure

if the engine will start;
2.3kg/cm2(230kPa, 33psi) at idle
2.5kg/cm2(250kPa,36psi) the moment the throttle is fully opened.
gage will fluctuate, average the readings

if the engine won’t start;
remove the air cleaner
turn on the ign switch
push open the air flap
that should kick on the fuel pump
should read 2.5kg/cm2(250kPa,36psi)

check the fuel tap, lines and check valve for obstruction, vacuum lines and regulator for air leaks

if pressure is high replace the pressure regulator
if pressure is low it’s either the fuel pump or the regulator