Regulator/rectifier went up in smoke
Had a bit of a nightmare with the DT125RE. Was fixing sticky throttle issue, sorted that and then had it running for around 10 mins.
After 10 mins of running I gave it a good rev and all of a sudden lots of smoke from under the tank and it was the regulator/rectifier. Luckily tank and seat wasn’t tightened, quickly turned off bike removed them and hosed it down. Didn’t catch alight.
Now could I get your thoughts to why this has happened and advice please to go about sorting this. Obviously won’t be trying anything with the burnt out regulator on it now.
Things worth noting..
- Aftermarket £30 rectifier/reg was put on September last year as couldn’t get OEM as they don’t sell anymore. Replaced back then as battery wasn’t charging and this solved the issue.
- Starter Solenoid does click and took a few attempts of it clicking for it to turn over ? Not sure if overtime that would burn out the regulator? (Was literally waiting for new one in post)
- Whilst running for a good 10 mins the starter was accidentally pressed whilst tightening hand controls after fixing sticky throttle. Shortly after it was then I gave it a good rev then started smoking.
- Earths all seemed good
- Red wire to regulator 4 pin plug burnt out
- Checked battery voltage and was 12 volts
Do you think it was just a faulty eBay regulator? What checks can we do? My mate says he has a power probe to check the voltages btw but will need guidance
Do you know if I can get a replacement 4 pin plug for the regulator/rectifier as like I say it is slightly damaged from where it got hot?
Links if poss please?
Looking online it seems a common thing over various bikes and that the regulator /rectifier is at fault.
Would appreciate your advice. Obviously Don’t want it happening again. Just lucky I didn’t get chance to go for a ride with it all bolted down..
Had a VERY similar problem from an eBay regulator on my Aprilia RS 125. The RS has a built in Voltmeter and the regulator was putting out 19 volts into my lithium battery. This eventually went up in smoke.
I didn't realise that this was a Chinese regulator as it was £40 and thought that was about right for a genuine one, which turned out to be more like £100.
So I'd put money on the aftermarket regulator, get a used genuine one.
Sorry, just finished reading the rest of the post…
Sounds like you may have a ‘sticky’ starter motor, it may of drawn way too much current which should of blown your fuse (Ahem! ??) but which took it out on your shitty fleabay part instead. Nothing personal to you, I just hate sub-par Chinese crap…
There are quality upgrade options out there that I don’t really understand. mosfet RR’s
Hopefully you know the item ID number for your original part?
I’m not an expert at MC electrics by any means, but thems my guesses! …
Thanks for getting back to me both of you
Ah right…Does sound like it most likely was the cheap regulator then. And potentially the clicking starter solonoid didn’t help.
I’ve actually just went up the loft to my box of DT125X spares and come across another regulator with the same stamp on the back as my old original one so hopefully that should do the trick. Also rather than using my aftermarket starter solonoid which just got delivered I’ve just found a spare original one.
In my box of spares there’s also a spare loom with the 4 pin plug I will need. Before I chop it off to use, do you know if I can buy this plug online? To save chopping a good condition loom
I’ve linked pictures and the plug I could do with.
Had a quick look atm but struggling to find anything similar atm that would fit. All different styles isnt there and you have to remember the regulator pins have a plastic wall around them so would probably need to modify that as well and different style might not stay on where it most likely wont fit the same ‘locking pin bit on the reg’
Will keep looking and worse comes to worse I’ll just chop it off this spare loom lol.
Thanks for that. I didn’t think about doing that.
I just checked and part numbers for regualtor / Rec on dt125re are
Will look tomorrow I I can find other models using the same part
As mentioned above though I won’t need to buy another regulator if the spare I have works fine but definitely good idea if not or if something breaks in the future
Looks like I got it sorted hopefully.
Yamaha Facebook group got reccomened some companies.
Will post links up for anyone else in the future and will update if works
https://kojaycat.co.uk/epages/950000457.mobile/sec66767ef64f/?ObjectPath=/Shops/950000457/Products/US4W-BLK-Conn - I chose this one US4W-BLK-Conn
Also other product numbers for above website :
4W-250-CNA , 4W-CNA-NAT
Then another website below got linked this which might work
Cheers for posting that. Handy as fux, I plan on swapping my probably Chinese RR out for a later type one like yours. I didn’t even spot that the plugs are different…
Saved me a lot of searching. I did not realise how many different kinds are out there!…
Sorry late reply, only got round to putting new plug on the other day but yeah no worries man
Replacement plug worked nicely. I replaced the regulator/rec and starter solenoid with oem parts as well and started lovely off the button. No more clicking from the starter solenoid or dodgy aftermarket rectifier going up in smoke