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I converted an 03 800 to an 03 900 and went to the dealer for gearing.
He looks up the part numbers and comes up with 15 wide top gear and 13 wide bottm gear for 26/41.
I checked browns and found the same thing.
Does any one know how come :dunno:
 

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Are you talking about an '03 ZR 900? I was just at brown's and they show a 24/39 13 wide! The '03 ZR 800 EFI has the same gearing>
 

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Black1010 is talking about the 03 late build black Zr 900 w/ 26/41 gearing.
The early build 03 green zr 900 used 24/39 gearing
 

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Originally posted by skyboz@Oct 8 2005, 09:35 PM
Does that mean the bottom gear just sort of "floats around" on the shaft?
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no, it's solid with nut and washer and aligned with usual shimming technique, this allows a very slight (.050'') vs old tolerance of .030'' variable in alignment and the chain will have less tendency to ''climb'' end plates creating ''jump offs'' as it would without near perfect alignment as required before if using both 15T wides top and bottom, the factor that allows this is the lower being 13T wide has more tooth contact with chain and distributes load more efficiently(not breaking teeth)allowing less weight and cost :cn:
 

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2021 Pro-S 850 137" 2016 SB 800 Pro-S 136"
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I've been using 13W top and bottom for the most of two seasons. When I updated gearing to 26/41 on my early build thats what the dealer put in. Dealer said I wouldn't have any issues and that the 13W is plenty strong - not to mention lighter. No issues yet.....
 

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That's very interesting info! :smiley-faces7: I've never heard of that before but if it works, what the hell, right? Can this be done on my ZL SS? Less rotating weight!
 

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i broke my drive axle and popped the chain and tore up the gears. i change the gearing and run the 15W upper gear and chain and run the 13W bottom gear. i ran it for at least 500 miles with no issues
 

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15W for the top gear because it is smaller with less contact to the chain = more strain applied to each tooth.
13W for the bottom because with the big gear so much contact mean much less strain per tooth.
 

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Is this typical on higher HP sleds? It seems like you could apply it to almost any sled. :fluffy:
 

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2021 Pro-S 850 137" 2016 SB 800 Pro-S 136"
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All I can say is mine has seen many races from a dead stop to WOT. No issues yet. Could just be luck.
 

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My early build ZR9 has 13w gears and chain. They looked good when I pulled them out for the 26/41 gears. My ZRT 600 with the 13w stuff had issues because of the high engagement... I don't know if torque is a huge issue if you don't slam it in at 5000rpm plus..
 
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