Project DTZr.....a DT125R love story
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@Hark_Ptooie If the spark plug gap isn't set correctly than the spark can just break down at too high a load. The spark plug annodes are saturated with voltage from the HT coil, if the gap is incorrect then this will cause issues.
@Calum said in Project DTZr.....a DT125R love story:
@Hark_Ptooie If the spark plug gap isn't set correctly than the spark can just break down at too high a load. The spark plug annodes are saturated with voltage from the HT coil, if the gap is incorrect then this will cause issues.
Ah - makes sense.
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@Hark_Ptooie I'll refresh the soldering as soon as possible because this problem drives me crazy.Everything is almost ready except this and cannot go for technical inspection.
@Calum I'll order a new spark plug cap from Yamaha dealer,although the current is within specs and the original one.I prefer to have a backup if not used
@SpookDog no such box on this model,It matches the cable harness of 3RN1 to 3RN9 of Haynes manual or the 3NC that @HOTSHOT-III posted to another thread if memory serves correctly.Side stand switch connects with negative and then to CDI blue/yellow.
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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.
@HOTSHOT-III said in Project DTZr.....a DT125R love story:
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.
Do you have any photo to see what you did,it's interesting to know,I have an old one with short cable.
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@Hark_Ptooie I'll refresh the soldering as soon as possible because this problem drives me crazy.Everything is almost ready except this and cannot go for technical inspection.
@Calum I'll order a new spark plug cap from Yamaha dealer,although the current is within specs and the original one.I prefer to have a backup if not used
@SpookDog no such box on this model,It matches the cable harness of 3RN1 to 3RN9 of Haynes manual or the 3NC that @HOTSHOT-III posted to another thread if memory serves correctly.Side stand switch connects with negative and then to CDI blue/yellow.
Sorry to keep on asking about the side stand switch stuff. Your CDI must have an embedded controller…
If I was you I’d try: running a new wire from the magnetic pickup to the CDI, also the wire from the CDI to the coil. You’ve swapped out everything else electrical that I can think of for the time being…
The ‘resolution’ of the ignitions ‘pulse’ is loosing ‘fidelity’ somewhere. There can’t be that many places left to look… -
I didn’t realise you were still having this problem!
I need to go back over and read it again…Is your bike one of the ones deristricted with the read switch?…
Edit: Just read back some and I’m interested in the ‘sparks from side to centre’ bit.
Did you ever swap out the CDI?… -
@SpookDog 2 spark plug cap,another used working one and one without resistor inside.
Yes with 2 more CDI I bought.
There's a thread at electrical section,you replied there also,if memory serves.My memory doesn’t serve me very well bud!
If it’s still doing the weird spark I’d try replacing the orange wire that runs to the coil, as far back as possible. It sounds like you may have a break inside the insulation, that is causing a weak or intermittent spark…
No plug should spark like you stated when it’s dry and clean…
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Pin the valve then if it still does it you know its not the servo
The black an white wire ( kill switch to cdi ignition ) can cause it to.spark every other kick.but yours is getting to 5000 rpm so I doubt it's that
One thing to remember half the wires in these looms the copper has turned black even though they look OK on the outside
