Posts
11
Joined
5/13/2018
Location
HU
Edited Date/Time
6/4/2018 1:47pm
2001 RM125
It sounds like running rich, but the spark plug is nice brown, and i have just replaced my crank seals. My ignition is retarded a bit. Running on 95octane, not better with 100 octane. Premixing with motul710 1:40. The bike pulls great, but sounds bad for me. The bike was rebuilt and I ran 10hours since rebuild. Stock nicasil cylinder, Vertexpiston(C size),new bearings(Prox(ntn)),and seals. Please help me why it doesnt sound well! Heres a video where i pushing it, but its not clear sound.
i cleaned the carb several times. it was running with 460 main jet, the spark was black.I replaced with 430 and its nice brown, and the sound of the bike is better, but still not clear.I dont want to go smaller main jet because it would be too lean, i dont want to seize it. pilot 25(stock 40), Main 430(stock 460), needle in the middle, air screw 0.5 out(if 1,5 out it bogs when i pull the throttle at low rpm.)Spark brown.(at full throttle i cut out the engine and i screw out and check the spark plug.)
Reed seemed OK.(no gap)
Videos:
It sounds like running rich, but the spark plug is nice brown, and i have just replaced my crank seals. My ignition is retarded a bit. Running on 95octane, not better with 100 octane. Premixing with motul710 1:40. The bike pulls great, but sounds bad for me. The bike was rebuilt and I ran 10hours since rebuild. Stock nicasil cylinder, Vertexpiston(C size),new bearings(Prox(ntn)),and seals. Please help me why it doesnt sound well! Heres a video where i pushing it, but its not clear sound.
i cleaned the carb several times. it was running with 460 main jet, the spark was black.I replaced with 430 and its nice brown, and the sound of the bike is better, but still not clear.I dont want to go smaller main jet because it would be too lean, i dont want to seize it. pilot 25(stock 40), Main 430(stock 460), needle in the middle, air screw 0.5 out(if 1,5 out it bogs when i pull the throttle at low rpm.)Spark brown.(at full throttle i cut out the engine and i screw out and check the spark plug.)
Reed seemed OK.(no gap)
Videos:
Check your reed valves and your valve too, does it really open?
I had a 2001 too, but can't remenber the jetting i had.
The Shop
But it sounds shit even lower RPM, when the exhaust valve should be closed. :\
here's a repair kit, just light and drop in the fuel tank
Seriously though, your RM125 has probably been infected with '125 Dream Race MEDIA BLACKOUT' virus, and it just won't run right until 125 results are posted.
Maybe detonation??
Pit Row
I figured out that my powervalve doesnt open. I was riding to home and i started to pull the throtle crazy, ganged up to 6 gear, and revved it to the point where i felt it started to weak like it does everytime, then i went in a bump and the bike started to pull like hell.I reallyzed my powervalve opened in the bump. So i started to riding wide open in my village with my gopro on, and after 10minutes crazy ride i finally caught on camera when its opening. Heres a video, its opening in the 27th sec.Full throttle in 1st gear then i go in neutral, then second and in second its open, but when i shift in 3rd its not open.
1) Remove the exhaust pipe.
2) Remove the powervalve cover
3) Put the exhaust pipe back on
4) Start the engine and rev it. Watch the powervalve arm move up and down. If it doesn't move, you have a problem.
I would also try a new spark plug cap or verify that your cap is fully snapped down on the plug, or that the little metal end isn’t loose on top of the spark plug if is the kind you can remove. I have a feeling this issue will end up being simple and stupid that is being overlooked and That it will make you laugh (or cry) in the end.
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