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Funny you should bring this up. I checked my 1999 ZR 440 Sno-Pro and found it was set to +2 ! Yikes!

Spoke to the owner of the dyno shop where this sled was tuned, and he indicated it should be set to 0 during cold weather (20 and lower) and -1 for warmer weather (20+). Not sure how it got to +2, but I will dial it back when I get back north next week. Dyno guy also stated; never run anything but 93 octane fuel in this engine - never. The engine was tuned with 93 Ammoco fuel.

Bottom line; the engine pulled like crazy at this setting. No problems whatsoever. Plugs looked perfect at the end of the day.

Member C-note is expert on these sleds, may want to PM to him.
 

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I rode mine for the first time over the past weekend. Brother had his ZRT600 and a passenger too. Everybody wanted me to give up the Sno-Pro so they could ride it. I'm usually not a greedy person... but... the Sno-Pro is a lot more fun that the ZRT in my humble opinion, especially when the trail gets bumpy. Keep a close eye on your plugs. I'm running a super cool BR10EYA plug for safety sake, and the insulator was a perfect "grocery bag brown" at the end of the day (the ZRT plug was black on the insulator and was quickly replaced with some fresh BR9ES plugs). Try to get your wife to ride the other sled and ride the Sno-Pro yourself, you'll not want to go back to the other sled.
 
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