What if Rm125?

bsward423
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bsward423
Edited Date/Time 2/15/2017 10:55am
If you had a clean slate (i do), how would you build an Rm125? I have an '02 frame, suspension (needs rebuilt), and a stock motor. What would you do? I want a 125 motor. No 144. Just curious what everyone thinks. I see a lot of builds, so I'm sure a lot of people have opinions.
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KooyaKooya
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KooyaKooya 2/10/2017 7:23pm
2/10/2017 7:23pm
I've also got an '02 RM 125. My favorite upgrades so far are:

1) 07 RMZ triple clamps. They swapped straight over, and changed offset from 24 to 21.5. They also give you some flexibility in bar mounting. $50 on Ebay.

2) 09 RMZ 250 fork internals. I kept the inner and outer tubes from the 125 because they are nice and thin for good flexibility, but the updated internal showa components from the RMZ reduced weight, stiction, and improved the action.

3) Honda front caliper. Only $50 on Ebay, and saved a quarter pound.

4) Boysen Rad Valve.

5) If you're riding MX, upgrade the shift pawl star thing and the shift pawl stopper arm to the 04+ version, you'll struggle less with accidental neutrals.

Otherwise the bike is really solid. Double check your piston/cylinder clearance, as mine was too sloppy, had to order a 53.96 pro x piston to solve problem.
K-dubbb
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K-dubbb 2/12/2017 4:50pm
2/12/2017 4:50pm
KooyaKooya wrote:
I've also got an '02 RM 125. My favorite upgrades so far are: 1) 07 RMZ triple clamps. They swapped straight over, and changed offset from...
I've also got an '02 RM 125. My favorite upgrades so far are:

1) 07 RMZ triple clamps. They swapped straight over, and changed offset from 24 to 21.5. They also give you some flexibility in bar mounting. $50 on Ebay.

2) 09 RMZ 250 fork internals. I kept the inner and outer tubes from the 125 because they are nice and thin for good flexibility, but the updated internal showa components from the RMZ reduced weight, stiction, and improved the action.

3) Honda front caliper. Only $50 on Ebay, and saved a quarter pound.

4) Boysen Rad Valve.

5) If you're riding MX, upgrade the shift pawl star thing and the shift pawl stopper arm to the 04+ version, you'll struggle less with accidental neutrals.

Otherwise the bike is really solid. Double check your piston/cylinder clearance, as mine was too sloppy, had to order a 53.96 pro x piston to solve problem.
What's the deal on number 5? Have part numbers by chance?

I too have an 02' that I love, but I do hit a pile of false neutrals....
KooyaKooya
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KooyaKooya 2/12/2017 8:05pm
2/12/2017 8:05pm
K-dubbb wrote:
What's the deal on number 5? Have part numbers by chance? I too have an 02' that I love, but I do hit a pile of...
What's the deal on number 5? Have part numbers by chance?

I too have an 02' that I love, but I do hit a pile of false neutrals....
Ya, here you go:

25381-37F30

25350-37F30

25355-37F00

If you pull up a parts schematic ("Gear Shifting") you'll see these parts listed next to the old '02 ones. You can see the difference in shape between the old parts and the 04+ parts. They swap right in and tighten up the shifting a fair bit.

And you might want to replace your pawls since you're in there already:

25323-34201

25324-34201
K-dubbb
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K-dubbb 2/13/2017 5:38am
2/13/2017 5:38am
K-dubbb wrote:
What's the deal on number 5? Have part numbers by chance? I too have an 02' that I love, but I do hit a pile of...
What's the deal on number 5? Have part numbers by chance?

I too have an 02' that I love, but I do hit a pile of false neutrals....
KooyaKooya wrote:
Ya, here you go: 25381-37F30 25350-37F30 25355-37F00 If you pull up a parts schematic ("Gear Shifting") you'll see these parts listed next to the old '02...
Ya, here you go:

25381-37F30

25350-37F30

25355-37F00

If you pull up a parts schematic ("Gear Shifting") you'll see these parts listed next to the old '02 ones. You can see the difference in shape between the old parts and the 04+ parts. They swap right in and tighten up the shifting a fair bit.

And you might want to replace your pawls since you're in there already:

25323-34201

25324-34201
Wicked thanks a lot - I can't really tell from schematic, but the cases DON'T need to be split to replace these right?

Will be in clutch side any ways to replace friction plates, I assume these parts are behind clutch hub?

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KooyaKooya
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KooyaKooya 2/13/2017 8:06am
2/13/2017 8:06am
K-dubbb wrote:
Wicked thanks a lot - I can't really tell from schematic, but the cases DON'T need to be split to replace these right? Will be in...
Wicked thanks a lot - I can't really tell from schematic, but the cases DON'T need to be split to replace these right?

Will be in clutch side any ways to replace friction plates, I assume these parts are behind clutch hub?

That's right, no case splitting required. You'll need to remove the inner clutch cover (the big one) and I think you have to remove the clutch basket to get good access to the parts, not just the clutch hub.

Here's a good vidjeo:

https://www.youtube.com/watch?v=Hiszn6MkCRU
Bruneval
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Bruneval 2/13/2017 2:58pm
2/13/2017 2:58pm
KooyaKooya wrote:
I've also got an '02 RM 125. My favorite upgrades so far are: 1) 07 RMZ triple clamps. They swapped straight over, and changed offset from...
I've also got an '02 RM 125. My favorite upgrades so far are:

1) 07 RMZ triple clamps. They swapped straight over, and changed offset from 24 to 21.5. They also give you some flexibility in bar mounting. $50 on Ebay.

2) 09 RMZ 250 fork internals. I kept the inner and outer tubes from the 125 because they are nice and thin for good flexibility, but the updated internal showa components from the RMZ reduced weight, stiction, and improved the action.

3) Honda front caliper. Only $50 on Ebay, and saved a quarter pound.

4) Boysen Rad Valve.

5) If you're riding MX, upgrade the shift pawl star thing and the shift pawl stopper arm to the 04+ version, you'll struggle less with accidental neutrals.

Otherwise the bike is really solid. Double check your piston/cylinder clearance, as mine was too sloppy, had to order a 53.96 pro x piston to solve problem.
Very interested to hear how you fitted the 07 RMZ clamps, if you wouldn't mind sharing. I know you say they bolted right on, but did you need to modify the frame at all, or weld on bump stoppers? Were the clamps you used from a 250 or a 450?

I would like to do this for my 06 RM125 as there's a lot more aftermarket clamps out there for the RMZ than there is for the 2 strokes! I have the original RM front end with the showa twin chamber 47mm forks and 2 stroke wheels.
KooyaKooya
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KooyaKooya 2/13/2017 5:35pm
2/13/2017 5:35pm Edited Date/Time 2/13/2017 5:39pm
Bruneval wrote:
Very interested to hear how you fitted the 07 RMZ clamps, if you wouldn't mind sharing. I know you say they bolted right on, but did...
Very interested to hear how you fitted the 07 RMZ clamps, if you wouldn't mind sharing. I know you say they bolted right on, but did you need to modify the frame at all, or weld on bump stoppers? Were the clamps you used from a 250 or a 450?

I would like to do this for my 06 RM125 as there's a lot more aftermarket clamps out there for the RMZ than there is for the 2 strokes! I have the original RM front end with the showa twin chamber 47mm forks and 2 stroke wheels.
The clamps were from an 07 RMZ250, and yeah, you're right about the stops, I had forgot about that more-than-bolt-on element.

I left the frame alone. If you look at the RMZ clamp, you'll see two little extrusions that are meant to bump into the RMZ frame to act as the stop. These extrusions are on the back side of the bottom clamp; not on the top surface like the RM clamps but on the side, back side... if that makes any sense. Anyway, these extrusions are machined flat at their end, so I simply drilled and tapped a hole straight into each one so that I could screw a bolt into the extrusion to act as the stop. If you didn't add the bolt, the extrusion would still act as a stop, but it would allow for more rotation than the RM clamps would with their top mounted tabs. The bolt isn't a great stopping surface; I suppose with enough banging it would wear on the frame. But she ain't a garage queen, so I'm not worried about it.

I looked for almost a year for an '06 era RM triple clamp for my '02 before finally giving up and going the RMZ route. The '06 RM clamp has the better 22.5 offset and the rubber bar mounts, as well as the legitimate stops, so it seems like the perfect clamp to me. If I were you I would just run the '06 OEM clamps that you've got. Or I'll buy them off you if not Smile . They have the added benefit of most likely being lighter than any aftermarket billet clamp you might find.
Bruneval
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Bruneval 2/14/2017 6:40am
2/14/2017 6:40am
Great info, thank you. Might give it a try and see if I can build up the stop with weld and have it machined flat. Scar make triple clamps for the RM 2 strokes still, but I don't like the look of them. Another option is to get the Scar clamps and have them re-anodized into a better color.

If I have no use for the OEM triple clamps, I'll let you know for sure!
bsward423
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bsward423 2/15/2017 10:58am
2/15/2017 10:58am
KooyaKooya wrote:
I've also got an '02 RM 125. My favorite upgrades so far are: 1) 07 RMZ triple clamps. They swapped straight over, and changed offset from...
I've also got an '02 RM 125. My favorite upgrades so far are:

1) 07 RMZ triple clamps. They swapped straight over, and changed offset from 24 to 21.5. They also give you some flexibility in bar mounting. $50 on Ebay.

2) 09 RMZ 250 fork internals. I kept the inner and outer tubes from the 125 because they are nice and thin for good flexibility, but the updated internal showa components from the RMZ reduced weight, stiction, and improved the action.

3) Honda front caliper. Only $50 on Ebay, and saved a quarter pound.

4) Boysen Rad Valve.

5) If you're riding MX, upgrade the shift pawl star thing and the shift pawl stopper arm to the 04+ version, you'll struggle less with accidental neutrals.

Otherwise the bike is really solid. Double check your piston/cylinder clearance, as mine was too sloppy, had to order a 53.96 pro x piston to solve problem.
I like number 2. That's a good idea. I'm still trying to decide whether it's worth it for me to build this thing. I need an entire engine rebuild top and bottom, new clutch, the whole nine. Forks and shock need rebuilt/valved. Lots of $$ involved. I have a KTM 300XC as my everyday bike, but I hate it on a MX track so I'd love to have the RM just as a moto practice bike.

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