NGPZ: Idle oddities on range bikes

Buehrle, Michael Michael.Buehrle at
Mon Aug 13 05:50:16 PDT 2007

raw propane works well also, just use a Bernzomatic torch (without lighting it of course.)

-----Original Message-----
From: John Soliday [mailto:johnsoliday at]
Sent: August 11,2007 1:20 PM
To: scapco at; gpzlist at
Subject: RE: NGPZ: Idle oddities on range bikes

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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