Rm125 help

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2/10/2019 12:10 PM

Anyone know the stock sprocket sizes front and rear for a 03rm125 and also what would you guys suggest to run for a little more low end? Currently running 13/49 which was how I bought it.

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2/10/2019 12:25 PM

Try running 13/51 that should make it a lot snappier

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2/10/2019 1:06 PM

Rotaholic wrote:

Try running 13/51 that should make it a lot snappier

Thanks! Going to pick up a sprocket and chain today. Yesterday was my first time riding it and the chain and sprocket were in decent shape so I figured I’d try that gearing before buying new, but it definitely needs to be done.

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2/10/2019 6:35 PM

Picked up a clutch kit as wel today was wondering if you knew what the torque specs are for the springs?

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2/12/2019 3:55 PM

For future reference, 12/49 gearing is stock. 13/51 will be slightly taller.

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Braaapin' aint easy.

2/12/2019 4:29 PM

wilh72 wrote:

Picked up a clutch kit as wel today was wondering if you knew what the torque specs are for the springs?

I never torque them just tighten them and the spring pressure helps also

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2/18/2019 8:00 PM

87 inch pounds. Make sure you torque them in a star pattern so the pressure plate sits evenly. Always torque engine parts, you're smart to ask that and not just go by feel.

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2/19/2019 11:14 AM

If you are going to use a torque wrench, please use an 1/4 inch drive.

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vomiting equals disqualification.

2/19/2019 12:13 PM

BR8ES wrote:

If you are going to use a torque wrench, please use an 1/4 inch drive.

Why not 3/8 drive ? Im curious.

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2/19/2019 12:45 PM

BR8ES wrote:

If you are going to use a torque wrench, please use an 1/4 inch drive.

SBD wrote:

Why not 3/8 drive ? Im curious.

Mainly because the torque spec is very low for the majority of 3/8 drives. Ideally you want middle of the road and majority of dirt bike fasteners are pretty low. There have been many bolts snapped with 3/8 in the low range. If that is the only wrench available, go easy. I rarely use a torque wrench on those clutch bolts as all you need to do is bottom the bolt and no more. My experience anyway.

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vomiting equals disqualification.

2/19/2019 12:51 PM

BR8ES wrote:

If you are going to use a torque wrench, please use an 1/4 inch drive.

SBD wrote:

Why not 3/8 drive ? Im curious.

BR8ES wrote:

Mainly because the torque spec is very low for the majority of 3/8 drives. Ideally you want middle of the road and majority of dirt bike fasteners are pretty low. There have been many bolts snapped with 3/8 in the low range. If that is the only wrench available, go easy. I rarely use a torque wrench on those clutch bolts as all you need to do is bottom the bolt and no more. My experience anyway.

Makes sense for the clutch spring bolts. Yes I have snapped one just snugging it up.

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