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  #1  
Old 11-27-2014, 10:48 PM
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Default Revving Issue on 1997 RM125

     

Bike ran fine and then all of a sudden bike died. There was no spark so I swapped the ignition coil and CDI box and then finally the stator and flywheel to find out that it was indeed the stator and flywheel. I have spark again and it idles fine, but when I roll into the throttle it will bog down and have this rhythmical sound that sounds almost as if the engine is being governed. Any thoughts guys?
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Old 11-28-2014, 06:45 AM
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A couple of questions...
How log did the bike set waiting for repairs?
Was fuel mix left in the carb and the tank?
Was the fuel fresh mixed when you fired it up?
Did you clean the carb?
Did you check the power valves?
Is the spark plug new?
What fuel mix are you running?

Answer these questions and maybe we can find the reason for the ill running.

Paw Paw
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Old 11-28-2014, 01:29 PM
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Did you set the stator plate back on the timing mark? If I remember right you can advance or retard the timing on those.
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Old 11-28-2014, 04:41 PM
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Hello,

1.) The bike sat for awhile before I bought, but the owner fired it up and I rode it for awhile after I bought it.
2.)I believe the gas was left in the tank, but the fuel valve was shut off and the gas was dumped before the previous owner fired it up.
3.)Fuel was fresh.
4.)Carb has been cleaned.
5.)I have not checked the power valves, but won't the bike usually at least moved if there is something wrong with the power valves? The bike dies immediately if shifted into first.
6.)Spark plug is new.
7.) Fuel mix is 32:1


I will have to check the stator plate timing.

---------- Post added at 05:37 PM ---------- Previous post was at 05:32 PM ----------

Yes the stator plate timing is correct.

---------- Post added at 05:41 PM ---------- Previous post was at 05:37 PM ----------

I also want to mention it ran good until the stator issue, then after replacing the stator it started doing this. I was told by someone that a bad stator can ruin the CDI. Has anyone else heard of this?? So does this sound anything CDI related?
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Old 11-28-2014, 04:58 PM
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Is the stator new? Did you replace it with an oem stator. I have seen the chinese ones wired wrong from the factory. You could still be having a problem with the stator.
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Old 11-28-2014, 05:42 PM
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Yes the stator is new, but it wasn't OEM. The new stator was cheap and most likely from China. It ohms out to what the book says so shouldn't it be good?
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Old 11-28-2014, 05:48 PM
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If it dies when you put in gear ....That sounds like the clutch plates are stuck. Pull them and clean the and put in fresh oil.
You will need to check the timing as the after market units may not be marked correctly.

Paw Paw
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Old 11-28-2014, 06:25 PM
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I am confident in saying it has nothing to do with the clutch based on how it acts when it's in neutral. If you give it gas it gives a rhythmical sound like its being governed. Once I am at 5 posts I will post a video!
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Old 11-28-2014, 08:48 PM
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But, you said "it dies when I put it in gear". That is a sign of stuck clutch plates and has nothing to so with how the engine idles! To test this...Put the bike up on a stand with both wheels off the ground. Start the engine and then put it in gear. Does it die? If not then I would check the clutch. If it does die then there is another problem.
Was the carb cleaned after it had set with gas in it or before?
Cleaning the exhaust valves is very important to how the engine as under power. It they are stuck it will not rev.

Paw Paw
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Old 11-28-2014, 10:48 PM
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Yes I have done this test. Even when on stands it will die when put into gear. The carb was cleaned after it sat. Would dirty exhaust valves cause that every time or just sometimes? Because this happens every time and it always sounds the same.

---------- Post added at 11:48 PM ---------- Previous post was at 11:46 PM ----------


Here is exactly what my sounds like when I try to rev it up.

Thanks for all your guys help!
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Old 11-29-2014, 04:31 AM
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Ok after see the video....Check your exhaust as it sounds like it is clogged up. This can be from varmits building a nest in the pipe or the silencer may have come apart and blocking the exhaust.
Also, I did not see an air filter in place....Do you have a rag stuck in the carb?
Paw Paw

Last edited by PawPaw; 11-29-2014 at 04:51 AM.
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Old 11-29-2014, 07:58 AM
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I would double check the ohms readings on the stator. It seems to me that the stator is not working correctly. Is it shooting a bunch of oil out the exhaust?
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Old 11-29-2014, 03:28 PM
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I agree the back firing is a tell tale sign of a timing/ignition problem, check all of your wiring/grounds etc. also when working on a 2-stroke you should replace the spark plug after each try until you get it rite, because it can burn, or foul plugs as you are trying to fix the problem, in turn will have you looking for something that might not be the problem, you can use a cheaper champion plugs until you figure out the problem, then go back to the ngk,
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Old 03-09-2015, 12:34 PM
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Default Stator

So I replaced the stator as I said, but checked the readings and the rearranged are okay. Does anyone know what kind of voltage values I should be getting out? I have 32 on one side but only like 5 on the other side for accessory?? Are these normal??
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Old 07-20-2016, 09:03 PM
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Default Video of Dirt Bike

Has anyone heard this noise before? I am still having issues figuring this out. Any input is appreciated!

https://www.youtube.com/watch?v=G6Z-yd_xYS4
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Old 07-21-2016, 05:14 PM
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The replacement stator is junk. It sounds like the pick up coil is wired backwards which would change the timing a good bit.

Paw Paw
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Old 07-21-2016, 06:18 PM
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Default Pick up wiring

Paw Paw,

Thanks for responding so quick! If the pick up is wired backwards am I able to just swap wires or is there something more to it? Also you referred to the part as the "pick up coil," I am picturing the little black box outside of the actual stator and flywheel. Is this correct?
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Old 07-21-2016, 06:25 PM
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Yes

Paw Paw
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Old 07-21-2016, 06:49 PM
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Default Pick up wiring

I just went out and swapped the wires. It runs almost identical as it did before I swapped the wires.

Last edited by Tro151; 07-21-2016 at 07:10 PM.
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Old 07-21-2016, 07:20 PM
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If that is the case , then reset your timing.

Paw Paw
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