NGPZ: Idle oddities on range bikes

Steve Northrop blackgpz at
Sat Aug 11 06:38:27 PDT 2007

Charles is exactly right. When the idle "hangs" like that, it's lean. Since 
it didn't do it before, you probably have a vacuum leak somewhere causing 
the leanness. For another bit of general tuning info, if the you blip the 
throttle and the idle speed dips below the set rpm and then comes back up to 
it, the idle is too rich.

Steve in Western NY
'96 GPZ1100
'02 Daytona 955i
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: <scapco at>
To: <gpzlist at>
Sent: Friday, August 10, 2007 5:30 PM
Subject: Re: NGPZ: Idle oddities on range bikes

> Steven,
> While you could have some partially plugged pilot jets, it
> sounds like they might have vacuum leaks somwhere.  Either
> the intake manifold the carb fits into could be loose and
> it's sucking air or the carb is leaking air somewhere else.
> I'd start by spraying WD-40 around the intake manifolds
> while the bikes are runing and see if the idle increases,
> if so it's an intake leak.  Otherwise, check the cap on the
> top of the carb to see if air's getting in and affecting
> the CV bladders and anywhere else there could be a leak.
> Charles S.
>>I do some (under)paid mechanic work for a local MSF
>>school, and I have two bikes acting a little strange.
> {SNIP}

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