99 RM125 Upgrades
- Thread starter darringer
- Start date
My son had a 99 RM125. Nice bike, btw, and a pretty friendly 125 in the woods.
Two things will help a lot- 1) get the jetting right. Stock is horribly rich at 55P/178M. We ended up using something like 45/48P and 168/170M, depending on weather.
2) Boyesen Pro reeds. NICE improvement and well worth the $35-40.
BTW, would you be interested in a used FMF TCII silencer?
Two things will help a lot- 1) get the jetting right. Stock is horribly rich at 55P/178M. We ended up using something like 45/48P and 168/170M, depending on weather.
2) Boyesen Pro reeds. NICE improvement and well worth the $35-40.
BTW, would you be interested in a used FMF TCII silencer?
KawiRider,
Usually, the bike will run a bit richer with the B reeds. On the applications I've had, the reeds will make the bike about a half or whole jet size rich, most particularly on the pilot.
Darringer,
You are welcome! Bummer on the TCII. I've been sitting on the thing for almost a year, expecting one of the two local buds with 99 RM's to pony up. I've given upon both of them; the one guy doesn't ride much and the other is still trying to find $10 to buy a couple of used tires from me.:ugg:
BTW, good advice from Simon. Try running a 51T rear, but note that you will need a longer chain. (might be a good time to toss on an O-ringer, which the 125 will pull just fine.)
Good luck!
Usually, the bike will run a bit richer with the B reeds. On the applications I've had, the reeds will make the bike about a half or whole jet size rich, most particularly on the pilot.
Darringer,
You are welcome! Bummer on the TCII. I've been sitting on the thing for almost a year, expecting one of the two local buds with 99 RM's to pony up. I've given upon both of them; the one guy doesn't ride much and the other is still trying to find $10 to buy a couple of used tires from me.:ugg:
BTW, good advice from Simon. Try running a 51T rear, but note that you will need a longer chain. (might be a good time to toss on an O-ringer, which the 125 will pull just fine.)
Good luck!
Last edited:
darringer
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- Dec 2, 2001
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- Thread starter
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MN KDXer
I put on a 52 tooth sprocket and it helped out the powerband. I liked the way it tightened up the gear ratios. Really makes a BIG difference when pulling long hills. Still wish I knew about that silencer earlier! I'm sure I could have figured out where to spend that extra scratch! I will be playing with the jetting after the Christmas rush is over. Thanks for all of your help!
Darringer
;)
I put on a 52 tooth sprocket and it helped out the powerband. I liked the way it tightened up the gear ratios. Really makes a BIG difference when pulling long hills. Still wish I knew about that silencer earlier! I'm sure I could have figured out where to spend that extra scratch! I will be playing with the jetting after the Christmas rush is over. Thanks for all of your help!
Darringer
;)
