Bali MC-13-250 Rectifier Too Hot? By gatekeeper (Read 1,433 times)

[gatekeeper]

I picked up a 2007 Bali MC-13-250 cheap last week as my new project. It runs, charges and everything electrical works. Today, in the process of changing the fuel lines I noted that the line coming from the tank to the fuel filter had been resting on the back of the rectifier. Where it had made contact, the fuel line had burned almost all of the way through. If I hadn't bought it the guy I got it from may have ended up with a serious problem. As I start putting things back together I will make sure that I tie the fuel line away from the rectifier to avoid any further such issues.

Now I know that by their nature, rectifiers give off heat. My question is, just how hot do these things get? Should I replace the rectifier even though the electrics seem to be working correctly? The fuel lines appeared to be the original ones.

[Alleyoop]

If it is NOT BROKE DON'T FIX IT

Forgot to add they do get hot. Lot of voltage is going through them.
Alleyoop

[gatekeeper]

Thanks Alleyoop. I'll be sure to tie that line away from it.

[Bashan]

How hot is it getting? Could you lay a small cheapo thermometer on it and get a ball park figure? I agree with the esteemed Alley, they do get hot hence the cooling fins. My CF Moto has a reg/rec similar to 250s and it gets very warm but I can lay my hand on it at any time. IMO, your unit is about to go even though it's still functioning properly. See if you can get a temp reading on it and get back to us, if it was melting through a line there's something wrong with it or something else down the pike. Rich

[Cruiser]

Measuring several points on my R/R on my YY250T averaged 130 degrees. That wouldn't melt any lines, but not all R/R's run at the same temp.

[gatekeeper]

Thanks Rich and Cruiser. I'm waiting on a new airbox to arrive. As soon as it does I'll start putting it back together enough to start it and try to get some temp readings. I'm taking advantage of giving it a good going over while I've got it apart. The PO didn't seem to be into maintaining it like it should have been. Can't just ride them forever, somethings got to give sometime!

[tvnacman]

where is it mounted , what is it mounted on , how many pins is it ? Did you have any lights on the larger the load the cooler it will be . If you had everything on the regulator would not have to dump the voltage to ground . If you had nothing on the regulator would have to dump it to ground (getting hot) .

John

[gatekeeper]

It is bolted to the frame on the right side. I'll have to double check tomorrow but I believe it sits under where the battery compartment is. Battery is under the seat. Now this has just reminded me that when I pulled the seat bucket out there was a hole melted thru in the bottom of the battery compartment. How in the h*ll did I forget to connect the two?!?

I've only had it for a week. I picked it up cheap for something to work on as I have wanted to get a 250 but can't afford a new one this year. I do know that it runs and all the electrical seems to work fine while idling. I wanted to tear it down and give it some long overdue maintenance that the PO neglected to do before I started using it. The PO did give me a new R/R with it. He said when he first got it 3 years ago, it had a charging problem and he was told to change the R/R. He did but that didn't fix it so he put the old one back it and it started charging again and has been charging ever since. I'll look tomorrow and see how many pins it has.

[tvnacman]

i have a version of that scooter , chunal / longbo . I had many problems with the charging system , it had a 4pin 6pole stator . i changed to 7pin 11pole .

[tvnacman]

scooterdoc.proboards.com/index.cgi?board=150cc&action=display&thread=2254



oh man I went looking for the links from my old posts for you then saw yours is a 25occ not a 150cc like mine . well in any case there is really great information . in the above links .

the 4pin 6poll to 7pin 11poll cost me just under $100 and about 3 hours time , with changine the plugs on the harness stator and regulator .

John

[gatekeeper]

Tvnacman, it has two plugs. One has 4 ins and the other has 3, so a 7 pin I suppose.

Rich, I got it assembled enough to run today. I laid a cooking thermometer down where the fuel line had been on the R/R and let it run for about a half an hour. The highest temperature reading I got was 125 degrees Fahrenheit. So now I don't know what caused the fuel line to look like that.

Also, the PO had told me the scooter has on overheating problem but in running it for a half hour the temp gauge never made it quite up the the half way mark. It was idling most of the time but I did hold the rpm's up for a few minutes. Next day or two I'm going to put the body back on it and do some road testing.

[bear]

The rectifiers do get warm. Be sure to check that you have good electrical connections to the rectifier and that all the contacts look good. If you have any bad connections (not a solid ) that will cause the rectifier to over hear. Also if the rectifier can be mounted a metal frame, the frame will act as a good heat sink and draw off some of the heat.

Bear.