Jeffrey Markham automan25 at
Fri Apr 20 13:11:12 PDT 2007

I was suspecting bad gas. Everything on the bike is stock as far as I know. I'll just have to spend more time with the bike to get a feel for what is really going on as well as make better use of third gear. Third gear is more fun anyway. Thanks for the insight.
Jeffrey R. Markham 
Digital Designer

----- Original Message ----
From: Bob Sims <bob.sims at>
To: GPzList at
Sent: Friday, April 20, 2007 12:33:40 PM
Subject: RE: Pinging

> Today I noticed a bit of pinging ...


Certainly not doubting your ears or experience, but are you sure what you
heard was really pinging (pre-detonation)?

I've never experienced it in the GPZ, but on other vehicles, it is normally
a *very* bad, catastrophic sound, accompanied with a loss of power.  As
Julian indicated, I think you could only make the GPZ ping by changing the
advance, bad gas, or letting the engine get *way* hotter than it does under
a normal range of operations, or some combination of those factors.  I don't
think I recall anyone on the list ever complaining of pinging in an engine
with stock geometry and ignition.

Of course, I could be wrong...


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