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post #1 of (permalink) Old 02-12-2002, 02:37 PM
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Gearing down

Has anyone heard or experienced going down one tooth on the front sprocket of the 2001 Raptor? I was unable to find anyone that sells a 12 tooth front sprocket. Everything is 13 or more. If you have found one, how does it work?

Yaaah they come to Roost the Rooster oh yaaah, yaaah but he ain't goanna die, he rides the Raptor yah, OH Yaaaaaaah, and he is goanna fly.
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post #2 of (permalink) Old 02-12-2002, 03:44 PM
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Re: Gearing down

Saw this on Ebay yesterday. Didn't say where it came from, but its for sale...

http://cgi.ebay.com/ebaymotors/aw-cg...681068&r=0&t=0


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post #3 of (permalink) Old 02-12-2002, 08:15 PM
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Re: Gearing down

We have them at work, we get them through parts unlimited, thats our aftermarket pats resource. $13 for a sunstar, or a JT. Also, I do belive that the raptor and banshee front sprockets interchange with eachother, so just order a 12 tooth banshee coutershaft sprocket.

Kyle

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post #4 of (permalink) Old 02-13-2002, 12:51 AM
 
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Re: Gearing down

why do you want to goto a 12 tooth sprocket? do you realize the additional wear you will put on the chain?

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post #5 of (permalink) Old 02-13-2002, 09:28 AM
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Re: Gearing down

I read some were it closes the gap between 1st and 2nd gear. For trail riding this has plenty of top end so I figured I could aford to loose some. I would like to hear from someone who tried it to get there opinion.

Yaaah they come to Roost the Rooster oh yaaah, yaaah but he ain't goanna die, he rides the Raptor yah, OH Yaaaaaaah, and he is goanna fly.
post #6 of (permalink) Old 02-13-2002, 02:22 PM
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Re: Gearing down

Many riders have gone to a 12 tooth c/s sprocket but I certainly would not do it myself. For one thing, it imposes unnecessary strain on both the countershaft and the chain due to the extreme bend the chain must endure in going around the smaller circumference. Your reason for doing so I think is flawed. I can't see how running a shorter 1st gear will do anything about the gap between the 2 lower gears as the difference will remain more or less the same. The answer is in altering the tranny itself, which is one of the changes made in the 2002 models. However if you're determined to do it, I believe the YZ250 bike uses the same c/s sprocket as the Raptor and should be available.

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post #7 of (permalink) Old 02-13-2002, 03:23 PM
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Re: Gearing down

I believe that changing the front from a 13 tooth to a 12 tooth will change the spacing between 1st and 2nd, but it will widen it and not shorten it.

Since final gear ratio in any gear is dependant upon your sprocket ratio times your gear ratio (1st or 2nd gear for example), then changing the sprockets to get a lower gear (higher numerically) will widen the tru final ratio (i.e. the gear ratio of 1st gear X sprocket ratio versus 2nd gear X sprocket ratio) slightly (maybe by 10 percent). or did I screw up the calculation?




post #8 of (permalink) Old 02-13-2002, 09:33 PM
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Re: Gearing down

You are right that lowering the gearing (giving top speed for more acceleration) will make the gears "closer" together. They really are the same, but since the bike will be able to pull second harder than before it is like haveing a closer spaced tranny.

Anyone here ever driven a lifted truck with big tires and no gearing change? That is what higher gearing will do. The gap between gears seems huge, you lose much more RPM at shifts than normal, and it makes it much harder to pull.

Anyway, I would not goto a 12 tooth front sprocket to accomplish this though. A tooth on the front is equal to 2-3 on the back, and really is a HUGE difference. Plus your chain will be strained more and wear itself and the sprockets much quicker. I suggest trying to go 1 tooth larger on the rear sprocket, 2 at most. This will be a very noticable difference from stock. With my old dirt bike I went 1 tooth bigger on the rear and definitly noticed more sand-pulling power, but I lost about 4 mph top end.

85 SR5, hey that rhymes!
post #9 of (permalink) Old 02-14-2002, 08:39 AM
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Re: Gearing down

Thanks for settting it straight.

Yaaah they come to Roost the Rooster oh yaaah, yaaah but he ain't goanna die, he rides the Raptor yah, OH Yaaaaaaah, and he is goanna fly.
post #10 of (permalink) Old 02-15-2002, 12:46 AM
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Re: Gearing down

I piped, jetted,and modified the air box, so I have almost 50 horse, and I DID NOT change gears, I dont feel any gap, I have all the power I need, even in the sand, were you feel the power lose more than anywhere else, but If I were going to change gear ratio, I would go 2 teeth bigger on the rear NOT smaller in the front

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