Hello forum, I'm new here, I would appreciate the help.
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Hello people, I am facundo, sorry for my English, I am using a translator. I recently purchased a 2000 DT125R with about 21,000 miles. After a carburetor cleaning, I moved the reed switch aside and removed the two pieces from the inside of the exhaust. The problem is the following: the bike reaches the power band but it is short, it does not exceed 9.5k, it seems like an electrical cut but I have doubts if it is rich. Before submitting to the forum, I read everything I could find about the problem on different forums and looked through it, but no luck. I already replaced the spark plug, cap and Ht, I also did the side stand thing, I already measured the fuel level in the carburetor and it was within range, the PV is working correctly and I checked it. The battery is new and its connections are good. Original carburetor with its jets corresponding to the model, main jet 240 and pilot 25. I need help, where I am from there is no information and almost none of these motorcycles, any suggestion would be appreciated, greetings.
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I add that it has 3rm-20 cdi, 3mb00 cylinder and 3nb cylinder head. chassis code de031 and under the seat it says 3rmj-030. I also want to thank everyone for all the information shared on the forum that I read previously and it helps new owners like me a lot.
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Hi there bud,
Sounds like a reed switch issue to me, or powervalve.
I've never done it myself before, but my understanding there seems to be two different ways of doing the reed switch, so double check that the reed switch has been applied correctly.
The other thing that causes this exact problem is where by the Powervalve closes in the higher RPMs limiting power. This is really easy to test to eliminate rather than figuring out the reed switch problem.
Allow the powervalve cleaning cycle to occur, and turn the ignition off when it's fully open, then disconnect the powervalve. This will leave it in the fully open position. You'll notice a large drop in performance at the lower RPMs, but the bike should come alive at 6K rpm and red line hard.
If this is not the case, then it's likely the reedswitch is a problem.
All of this assumes that the engine is in a healthy state. And that the ignition system is all up to scratch.
Obviously there are a multitude of factors that cause loss of performance, but assuming that the engine is good condition, that's where I'd start.
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Thanks for the suggestions @Calum . Today I checked the battery connection again, I disconnected it, cleaned it with wd40, plugged it back in and to my surprise it is now worse, the same fault but around 8k. Will the CDI have any memory and when you disconnect the battery does it reset in a certain way? I'm going to try putting the reed switch back in its original spot, causing the limiting to work, and then removing it again. It doesn't have much science but the truth is that it drives me crazy. I haven't tried disconnecting the PV yet, I have it pending to rule it out. Although accelerating at wot and without the cover, seeing the pv pulley, it works fine.
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There is no memory in the CDI to my knowledge.
A weak battery will cause issues with the powervalve, so will things like fault rectifier and bad stator etc.
But just wanted to start simple.
Have a look at @scrimsmustang guide on derestricting your model.
