RM125 Gearbox

KarlssonRacing
Edited Date/Time 3/11/2015 11:32pm
Hi!
So I have a Rm125 2008 and the problem is that it´s hard to get it in 4th gear when riding.

It´s not the gears.

It seems like it doesn´t lift the gears properly and the tranny jumps into neutral..

Can it be the shafts that the fork lifters are moving on?( We changed the "cam, gear shift" last spring and I don´t think it is that one)


(waiting on some plastics so I can install my all new decalworks graphics :D)
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Cygnus
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Cygnus 3/11/2015 9:07am
3/11/2015 9:07am
The star that bolts to the drum comes loose on those. Check that first. If not a bent fork is probably the culprit.
Randy Savage
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Randy Savage 3/11/2015 9:12am
3/11/2015 9:12am
Cygnus wrote:
The star that bolts to the drum comes loose on those. Check that first. If not a bent fork is probably the culprit.
This. loctite the shit out of it.
mxtech1
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mxtech1 3/11/2015 9:53am
3/11/2015 9:53am
Cygnus wrote:
The star that bolts to the drum comes loose on those. Check that first. If not a bent fork is probably the culprit.
I doubt it. If the retaining bolt comes loose, it will be hard shifting into every gear, not just fourth like he said.

It's most likely the shifting fork (#1 and/or #2) or the shifting cog (#7) has wear in the path that causes the stud of the shifting fork to hang up on.

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Bruce372
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Bruce372 3/11/2015 10:05am
3/11/2015 10:05am
seen this before, check that the shift lever isn't one spline off. or if you have an aftermarket shifter, go back to stock.

very common problem
KarlssonRacing 3/11/2015 10:33am
3/11/2015 10:33am
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that!

Thanks Bruce!! Im so stupid.. Last time I used an aftemarket shifter it hit the engine block.. And last practice I put it back on to try if it helped, it started to be harder to shift again and didn´t get in 4th correctly...

Look what the aftermarket shifter did to the engine block..


KarlssonRacing 3/11/2015 10:34am
3/11/2015 10:34am
Ordering a new OEM one tomorrow. Keeping my fingers crossed
KarlssonRacing 3/11/2015 10:38am
3/11/2015 10:38am
Need to thank you all for fast answers! I´ll catch up next week and tell you guys how it worked out!
mx836
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mx836 3/11/2015 10:47am
3/11/2015 10:47am
Is that a big flat spot on your rear rim or am I seeing things?
mxtech1
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mxtech1 3/11/2015 11:03am
3/11/2015 11:03am
KarlssonRacing wrote:
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that! Thanks Bruce!! Im so stupid.. Last time I used...
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that!

Thanks Bruce!! Im so stupid.. Last time I used an aftemarket shifter it hit the engine block.. And last practice I put it back on to try if it helped, it started to be harder to shift again and didn´t get in 4th correctly...

Look what the aftermarket shifter did to the engine block..


Would have been helpful to include this in the original post.
Spagina767
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Spagina767 3/11/2015 11:14am
3/11/2015 11:14am
KarlssonRacing wrote:
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that! Thanks Bruce!! Im so stupid.. Last time I used...
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that!

Thanks Bruce!! Im so stupid.. Last time I used an aftemarket shifter it hit the engine block.. And last practice I put it back on to try if it helped, it started to be harder to shift again and didn´t get in 4th correctly...

Look what the aftermarket shifter did to the engine block..


mxtech1 wrote:
Would have been helpful to include this in the original post.
If he had thought about that originally, I doubt there would even be a post...
KarlssonRacing 3/11/2015 1:46pm
3/11/2015 1:46pm
mx836 wrote:
Is that a big flat spot on your rear rim or am I seeing things?
the camera angle makes it worse than it is.
KarlssonRacing 3/11/2015 1:48pm
3/11/2015 1:48pm
KarlssonRacing wrote:
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that! Thanks Bruce!! Im so stupid.. Last time I used...
number 1, 2 and 7 was replaced last spring mxtech1 so I don´t think it is that!

Thanks Bruce!! Im so stupid.. Last time I used an aftemarket shifter it hit the engine block.. And last practice I put it back on to try if it helped, it started to be harder to shift again and didn´t get in 4th correctly...

Look what the aftermarket shifter did to the engine block..


mxtech1 wrote:
Would have been helpful to include this in the original post.
Spagina767 wrote:
If he had thought about that originally, I doubt there would even be a post...
unnecessary post..
Spagina767
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Spagina767 3/11/2015 2:24pm
3/11/2015 2:24pm
mxtech1 wrote:
Would have been helpful to include this in the original post.
Spagina767 wrote:
If he had thought about that originally, I doubt there would even be a post...
KarlssonRacing wrote:
unnecessary post..
No, not really. I wasn't beating up on you, I was sticking up for why you did not include that.
KarlssonRacing 3/11/2015 11:32pm
3/11/2015 11:32pm
Spagina767 wrote:
If he had thought about that originally, I doubt there would even be a post...
KarlssonRacing wrote:
unnecessary post..
Spagina767 wrote:
No, not really. I wasn't beating up on you, I was sticking up for why you did not include that.
my bad then..

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