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Discussion Starter #1
I'm heading out to the Bighorns in March near Burgess Junction. I'm
taking my 2002 600ZR. Does anyone know what elevation most of that
riding is? I think Bear lodge where we'll be by is around 8000 ft.

On the toolbox lid of the ZR it recommends

1) a gearing change of top and bottom gear and a different chain.

2) elevation 5000-9000 - yellow/wht clutch spring, 50 g cam arms and
53 degree helix

3) elevation 9000 and over - yellow/wht spring, 47g cam arms and 51
deg helix


I talked with one person who regeard for out there and said I didn't
need to get a new chain because you drop a tooth on the top gear and
gain a tooth on the bottom gear and it's essentially reversing the
gearing which still keeps the same chain size. Can anyone verify
this?

Also,Which elevation would you set up for?

Thanks,
Mark
 

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If you have a 20/39 you can have 19/39 or 19/40 with the same chain. If I were you I would do number two and take along a 51 helix and red/white secondary if you allready have one to tune it
 

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Discussion Starter #3
Thanks for the reply.

I'll be going to a 19/40 so I should be able to use the same chain. When I ordered the rest of the parts I ended up ordering the 9000 and over package (47g weights, 51 deg helix). I think it's too late to send everything back and reorder for the 5-9000 elevation.

How will this run?
 

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you wont need a different sized chain. call out there and find out what elevation that is, and clutch it exactly how its reccomended on the airbox. thats a once in a lifetime trip, don't try to save money on a few cheap parts. take along an extra $200 to rent a mountain cat with a long track for a day. what a sled for the mountains. you'll be glad that you did. don't forget the shovel. have a great time.
 

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I just came back from wyoming with a 2002 ZR EFI, 47gm. yellow green, 51 helix red white 3rd hole. worked great. I did match the weights to 46.5gms because one of the weights were off .5 gms.
 
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