Project DTZr.....a DT125R love story
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Are you using a genuine Yamaha ignition coil?
I've had this when I mistakenly bought a "Racing" coil off of eBay. Bike would initially run fine, then the coil would be saturated and the bike would barely idle let alone rev off! I had to ride back from Wales like this and it would struggle to do 50mph.
Bought a brand new genuine coil and the problem went away.
My brother had the exact same problem on his RD350, crappy Chinese coils...
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Do you know the ID number of your CDI bud? I’m guessing that you can use any early one if you have a 3 coil stator? I don’t know what the postage is to Greece but I’ve got one you could use to swap out and check if it is the CDI…
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@Calum Yep, happened to me as well!
The actual coil on DTRs is very good quality so it's well worth fitting a new lead even to an older one; you can cut off the very top of the coil's outer case where the lead pushes in with a junior hacksaw, pull out the old lead and solder the new one to the coil output for a really good connection. Then re-waterproof using Shoe Goo and electrical tape. Looks messy but no-one can see it under the tank.
I had a high-rpm misfire once, after trying everything else we replaced the HT lead in the manner described above which took around 1 hour on a summer's day so the engine was neither stone cold or up to temperature when I took it for a test ride. It wheelied out of the driveway without me even trying, and I couldn't believe how much better the performance was at all engine speeds. Made a big impression on me as I was 17 at the time and I'd spent practically a weekend trying to fix the bike and getting nowhere.
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OKay, it’s:
3NC -00
93NBelieve it, or not!
…But I’m in the UK & have no monies till a week Wednesday (8 days)
If postage can be sorted out I’ve no problems lending it to you for testing, or selling it if it cures your problems…Have you swapped out the magnetic pickup? The wire can break inside the insulation where it exits the crank case…
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@SpookDog Is it working ok?How much you will sell it (pm the price)?
No I did not,used the whole stator that came (a 3MB-00) but bike does the same like mine the 3NC-00.Both stators are with in specs,checked with a multimeter according the service manual. -
While measuring by curiosity,I noticed something not right.
Measuring point is battery connectors with a multi-meter.
Charging voltage with battery is 14.8v at 3000rpm,voltage without battery attached is 6.5v at 3000rpm.
I've managed to run it 2 time 2-3 mins each,the second time a dared to throttle it above 5000rpm it died no matter the kick start times no run.
Malfunctioning rectifier/regulator? -
Some regulators will not work without a healthy battery
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M MadGyver referenced this topic on
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When you’ve tried everything that is likely, all that’s left is the unlikely…
I think mr shadi had to disconnect the wires to the read switch while the revs were above 6-7000 for it to work…
I’d read his post through to be sure though…
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@Calum What can I check or test,any idea.
I have read topics here and on the old forum,the Yamaha club forum but no solution resolve my problem.
I'm on a dead end,followed the Yamaha service book,the Haynes, solutions from topics,whatever I could think,but now nothing. -
Sorry, I think I’ve confused you with another different thread. My bad 🫤 …Edit: Yeah, definitely misstuuke your Fred for another one. Sorry again. It was Har ptooie‘a thread I was thinking about…
It doesn’t help that every time I try and read back through this thread I get thrown back to post number 6! Is there some kind of lag with pics loading up? (iPhone user)
Do you have a power valve servo fitted? Have you tried running the bike with it disconnected? (If you do?) 5-6K seems like power valve territory…
Just hunching at anything that seems relatable… -
Managed to read the thread again! Need more info!
When it dies have you checked the plug? If so does the plug still spark? Is it wet?
I’m guessing that you have a solenoid box under the seat? (I have two) They are to do with the side stand switch/ignition cut out. Have you checked that these aren’t ‘firing off’ on their own @ 5K?
Have you got another key-ignition barrel you can swap out to try?
Have you checked the kill switch?I know that it might be reaching but you’re at the point where you have to try any&every-thing…
