NGPZ: Idle oddities on range bikes

John Soliday johnsoliday at
Sat Aug 11 10:20:24 PDT 2007

I didn't know WD40 could be used for a vacuum leak analysis, I've always
used carb cleaner. 

-----Original Message-----
From: scapco at [mailto:scapco at] 
Sent: Friday, August 10, 2007 3:30 PM
To: gpzlist at
Subject: Re: NGPZ: Idle oddities on range bikes


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.

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