High Altitude GPZ

John Soliday johnsoliday at msn.com
Sat Jan 5 10:04:03 PST 2008

Has anyone changed the jetting on the GPZ for the US High Altitude spec?


Main Jet:  110 > 108

Pilot Jet:  35>32


Seems like a pretty mild leaning of the carbs and my bike always smells and
“runs” rich up here at ~ 5K and higher.


Also I’m running a Muzzy adjustable advance and have it at full advance with
no pinging on regular octane fuel so I think there is some performance and
MPG to be gained by leaning my bike at least up here.



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