sprocket change - Yamaha Raptor Forum
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post #1 of 13 (permalink) Old 06-02-2012, 02:45 AM Thread Starter
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sprocket change

Just picked up 2011 125 for my son and would like to change front sprocket to a 13t. Does anybody know for sure if the front sprocket for a 250 will work on the 125? Having a hard time finding a 13t front sprocket for the 125.
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post #2 of 13 (permalink) Old 06-02-2012, 10:55 PM
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sprocket

I dropped to a 13 with our's. try looking for one for a ttr 125 the dirt bike.
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post #3 of 13 (permalink) Old 06-03-2012, 09:55 AM
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Wow - 13! I'm running a 15 tooth on my daughter's 125 with good results. I don't see that the ignition is good enough to wind-up and run the higher rpms that a 13 tooth will bring. My daughter ran out of gear with the stock 14 and spun the tires too much. Then again we're running a Jason Wiedner built motor with tons of bottom-end power.

srxmiller is right, the ttr125 dirtbike sprockets are the ones to look for, ebay has a ton.
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post #4 of 13 (permalink) Old 06-05-2012, 09:59 AM
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Hi Guys,

I really think gearing depends on engine design, tire size, track type and conditions. I gear for the longest straight on the track.

If I have a 400 yard straight, I don't want to run out of gear in 200 yards and if my longest straight is 200 yards, I don't want to be just clicking into 3rd at the end.

Each one of these examples I'm giving something away to the competiters and that is what I don't want to do.

CCD Howell: you are right, If you have a bottom to mid range motor, then gear it to work in that range, don't gear it to scream around the track if the engine isn't desiged for that. If you gear it to scream around the track, then your giving away the torgue and HP at which the engine is designed.

It is just like gearing a 2 stroke only a 4 stroke is more forgiving, 2 stroke you must keep it on the pipe, and that is where they make power.

Thanks,
Jason Weidner
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post #5 of 13 (permalink) Old 10-14-2013, 02:40 PM
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My son ran his first cross country race, completely stock motor no pipe, I want to give him more pull in the woods what would you guys recommend for front sprocket size?
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post #6 of 13 (permalink) Old 10-23-2013, 10:21 AM
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Quote:
Originally Posted by kmongo View Post
My son ran his first cross country race, completely stock motor no pipe, I want to give him more pull in the woods what would you guys recommend for front sprocket size?
You will want to either drop a tooth on the front or add teeth to the rear, either one will increase bottom end for the woods. You can drop a tooth in the front and still use your existing chain.

Thank
Jason
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post #7 of 13 (permalink) Old 10-26-2013, 07:57 PM
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Thanks Jason, we ran Iron man this weekend my twin boys had so much fun, can't wait to get the raptor's torn apart and start on their woods weapon for next year!
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post #8 of 13 (permalink) Old 11-05-2013, 02:49 PM
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Any one know the stock chain size, can't read it on the chain. I might be too blind already.
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post #9 of 13 (permalink) Old 11-10-2013, 09:11 AM
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It is a 428 chain and 110 link.
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post #10 of 13 (permalink) Old 11-17-2013, 06:12 PM
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I just ordered a couple 13 tooth drive sprockets off ebay today. We have a built motor and my son has never had to shift up into 5th on any of the MX tracks we have raced. So hopefully the more effective gear ratio will help get us around the track quicker.

I don't think you can use a Raptor 250 sprocket since they use a bigger chain.

08 TRX 700XX
06 TRX 400EX
12 Raptor 125 (race)
12 Raptor 125 (practice)
04 TRX 90
11 DRR 50
01 Seadoo Challenger 2000
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