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I read in an earlier post that the 2001 efi runs richer than the 2002's that's why they advise on running premix in the first tank this year.  Is this true?  I was told by my dealer that there is absolutely no difference between the 2001 & 2002 ZR 600 engines.  He also told me that was a mistake(well, they reconsidered) last year when the manual said not to run premix in the EFI's.

I know in a back post(many back) I was wrong in the way that I concieved an attitude by another member(POWDERBOY) and I do appologize many times over, but please help me out on this question.

I love you guys and don't want to be excluded on great tech tips!!!  I want to help as well as be helped, I know I've got great tips to be presented to this forum!!!!!!!
 

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when i was up in thief river falls for the racing school and the unveiling of the 2002 sno pro i got to talking with kirk hibbert and he said that they did some remapping of the efi on the 600's from 2001 to 2002 the 2002's are supposed to be stronger runners then the 2001's

remapping of the efi doesnt necessarily mean that it is set up to run richer or leaner i do not know an answer for why they would want you run premix in the 2002's and not the 2001's
 

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In the December issue of Snow tech there are a few articles about the Artic Cat changes from 01 to 02 and apparently the 02 are quicker.
 

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Boatmaan - I am currently looking at Arctic Cat Service Advisory Bulletin SAS103 and it says that the owners manual and service manual are WRONG for 2001 about premix. It advises to run 100:1 for your first tankful. So, apparently there is no difference.
 

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The only thing I know for sure about changes in this years motor is involving the cleaning cycles of the exhaust valves. It is entirely possible that they remap the timing or efi but these changes are to make the motors more durable.Also one and 1/4 ounces of oil per gallon is not going to hurt anything,i would rather foul a plug than not break in a new sled without a tank of pre-mix. I have not seen any efi sleds burn down because they ran the pre-mix,causing the motor to run lean.
 

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Have broken in many new sleds, 94 wildcat, 97 ext600, 99 zrt-800 and the new zl fuelie, and have NEVER mixed oil and gas on first tank, pretty much started running it the way it was gonna be run, except for wide open throttle for extended distances, have never had a motor problem on ANY  of em,,,  All are still running today
,,,,,,
 

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Well said HP &Torque, I agree completly.  The only reason they tell you to do this is to cover their buts on warranty costs because more oil will allow a sled that is boarder line on tolerances to survive.  You end up with a sled that didn't blow the motor on warranty and is slower than everone elses.
 

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Thanks Fastcat800!!  Where in Mpls are you?
 

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Why would a sled that was broke in with pre-mix slower than one without pre-mix?  I have heard this many times in the last 20 yrs, but have never understood the mechanics behind.  If someone knows, please explain to us.  I also don't run pre-mix in new sleds, but don't really know why.  Thanks for the help.  Later.
 

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The reason for running premix in the first tankful is to provide additional lubrication during the inital "setting-in" of the rings and oil seals on the pistons.  During your first run or so, the rings will be rubbing more on the cylinder walls while they find their "groove".  Providing a premix in the first tank will give them some extra lube so that your motor breaks in better, and will last longer.  I have no idea how the sled would run slower because of premixing the first tankfull.
 
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