Steve Northrop blackgpz at
Sun Sep 21 07:56:13 PDT 2008

In the rpm range you describe, fuel is controlled by the pilot circuit. 
Turning the pilot screws out in 1/2 turn increments, provided there are no 
vacuum leaks, is the recommended fix.

Steve in Western NY
'96 GPZ1100
'08 KLR 650
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: "Dad (Les) Johnson" <jjohnsonlta at>
To: <GPZList at>
Sent: Sunday, September 21, 2008 1:14 AM
Subject: Surge

>       I purchased a used  96 GPZ 1100. I am currently working on getting 
> it
> serviced and running strong to my liking.The bike seems to surge (noticed
> more in lower gears) when you try to cruise it at a steady RPM between 
> 1000
> to 3500 .  After that it runs fine on up to red line.. It has done this 
> ever
> since I first test drove it. The plugs look close to new but showed just a
> very slight hint of light tan on a couple of them. The others are white on
> the porcelain . Looks to me it's running lean. I am at about 200 ft elev. 
> I
> can put the chock on with it running and it seems to run better in those 
> ranges.  I know I had a ZX-11D that had a flat spot in the power band. I
> ended up shimming the needles and cured that. The problem was different 
> from
> this. This seems to happen with the throttle just barely open. I am
> wondering if this is common to this bikes? Maybe the pilot jet screws need
> screwed out another 1/2 turn or so. I also drained some  gas from two of 
> the
> float bowls to see the condition. There was just a very ,very  slight hint
> of super small particles. I wouldn't think enough to clog anything. Any
> thoughts on proceeding from here? 

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