Rm 125 power

Thomas_Goodrich
Edited Date/Time 4/9/2020 5:54pm
I have a 2000 rm125. I bought the bike brand new. Sold it, and bought it back. The bike used to be all top end. It ripped pretty good. It now has a Fmf SST pipe with fmf shorty silencer, Boyesen power reeds, and has stock gearing. The bike has over 160psi of compression and runs well, it’s just gutless. The power doesn’t seem to carry into the high rpm. It signs off early. Is the exhaust/reeds killing my top end power?
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Paw Paw 271
Profile picture for user Paw Paw 271
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3632
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4/3/2013
Location
Benton, LA, USA
Paw Paw 271 4/2/2020 6:44pm
4/2/2020 6:44pm
Power valve working correctly?
Set correctly?
What does the spark plug look like?

Paw Paw
1
Thomas_Goodrich 4/2/2020 6:47pm
4/2/2020 6:47pm
Paw Paw 271 wrote:
Power valve working correctly?
Set correctly?
What does the spark plug look like?

Paw Paw
I verified the correct Pv setting. I haven’t taken it apart to make sure everything is moving freely. The spark plug looks perfect.
mxrose3
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2350
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8/17/2006
Location
Delmar, DE, USA
mxrose3 4/2/2020 8:50pm
4/2/2020 8:50pm
The reeds aren't hurting anything, but I know the SST pipe on other bikes shifted the power around. The shorty silencer takes away some from the top end also. Is there carbon build up in the pipe? Did he mess with the ignition timing (stator)? Hows the compression? These are things to check
Chris99Flannery 4/2/2020 8:52pm
4/2/2020 8:52pm
Has the squish been machined down and not compensated?
I had a broken core in my old pc muffler- that hurt topend haha

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Thomas_Goodrich 4/9/2020 5:54pm
4/9/2020 5:54pm
Power valve was unhooked! Hooked it up and she rips!

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