2007 jonway yy 250 t By ronscycle1 (Read 15,074 times)

[JR]

Good tests good questions. It's apparent the diode is bad and the battery is good. Yes the brown wire hooks up before the diode and the lights only work when the scooter is running.

That's the design as the red wire feeds the lights where the brown wire splices in and then goes to the battery for charging. From the battery the red wire is fused and goes to the ignition to feed it 12Vdc. The with the key on the 12Vdc runs through the black wire to the fuse box to feed other things.

Here is a wiring diagram on this scooter it's the first of four versions;

thescooterprofessor.proboards.com/index.cgi?board=250g&action=display&thread=430

Now what I'm suspecting now is when you reve the engine up you are putting out more current and you have a very bad connection on a wire that is pulling way too many amps, you mentioned the fan, you need to go through this circuit and make sure all is well, it pulls enough by itself and doesn't need bad wires to hurt it anymore. Check the connections right on the back of the fan where the wires hook up, I found one of mine almost loose as they are soldier on and it was causing a bad amp load.

The fuse box. pull it out the wires are sometimes very poorly connected, many a person has pulled their hair out over this problem.

Lastly you could have a R/R that is loading up and having problems at a higher RPM but before you go buiy one even check out every wire on it too. Replace the diode or go to the tech section and get the how to on installing a relay and eliminate it.

Yes been to the Gulf coast in Texas, years ago worked for Brown&Root in Houston and lived in Baytown, loved the seafood, hated the temps!

JR

[cruiser]

JR has done a very thorough analysis on this problem. The connections on the back side of the fuse block tend to be loose. The original fans can also be power hogs and all connections (crimped and soldered) should be checked. The diode certainly sounds bad and the R/R is a weak point on these scoots. As JR says, get the wiring and connection problems fixed before changing out parts.

[dleonard]

Thanks guys!! Sounds like I have my work cut out for me over the next few days. I have to leave Sunday for a Career and Technical Education Teacher conference, I'll be gone a week so it will be awhile be fore I get back to you on the results. What real makes me feel stupid is I teach auto tech and maritime transportation and haven't been able to figure out a blasted scooter. I was about ready to pull my hair out and I can't afford to do that. I did find a really bad connection at the blue and green wires going to the stator area. If you wiggle the connector the engine shuts off. (not good)
I don't see the blocking diode in 2 of the diagrams I have, is it supposed to be a trade secret? Ha Ha!

[dleonard]

I have what is most likely a really dumb question. Is there such an animal as a service/repair manual for this scooter?
By the way the diagram link you have me is great. It looks like most wireing is the same color and I SEE the diode now!
Cruiser how long have you had your 2008 Jonway YY250T? Has it served you well for the most part. I love my 2008 this charging thing has just been a drag.

[JR]

Never a dumb question asked and the answer is yes and no. We have a engine manual that is for another scooter but the engine is the same and we have a Honda manual for the body style.

Also some generic manuals. But like on a lot of Chinese a true service manual dedicated to just this scooter, Nope.

JR

[cruiser]

Jul 10, 2012 19:02:21 GMT -6 dleonard said:

I have what is most likely a really dumb question. Is there such an animal as a service/repair manual for this scooter?
By the way the diagram link you have me is great. It looks like most wireing is the same color and I SEE the diode now!
Cruiser how long have you had your 2008 Jonway YY250T? Has it served you well for the most part. I love my 2008 this charging thing has just been a drag.

I bought my scoot new in 2008. It has served me well once I made adjustments for the weak charging system which is common to these scoots. It is a smooth and peppy scoot and has all the original parts except the fuel pump which I switched to electric at the PDI. Also upgraded to 19 gram sliders which was well worth the money. Right now I am going to do some carb work due to idle related problems. Parts are reasonable too. I picked up an exact replacement carb for $43.

[ronscycle1]

put on new regulator ,still not charging enough,it goes from 11.86 volts to 12.01

[ronscycle1]

checked the dash bulbs they have been replaced with a higher watt bulbs ,would this make a difference? by passed the diode with a 30 amp relay

[JR]

Yes and high much higher? They are supposed to be only 3W. You can even gain some voltage by replacing them with LED's. There should be 4 or 5 I don't remember for sure but 4 of them at 3W = 12W = 1 amp. Totally replacing them would be only at the most 2W total. Everything helps especailly on this scooter.

Replacing the side running lights on each side of the headlight saves some, and the 1157 tail/brake light bulbs with LED's is a big gain. It all adds up.

JR

[ronscycle1]

why at the regulator plug in the reg plugs has 3 yellow and the other has a black . green,red and on the harness side it has 3 yellow , and on the other plug on the harness side it has a green ,black and a yellow is the yellow wire same as the red ?

[JR]

The 3 yellows are the 3-phase AC voltage feeds from the stator going to the regulator.

The other 3 wires are as follows;

Red = battery charging wire going to battery
Green = ground (negative)
Black = 12 volt wire going to ignition that reads the voltage and tell the regualator what to chare at.

[ronscycle1]

still trying

[ronscycle1]

had this thing since Christmas put a whole 27 miles on it

[JR]

Ron I'm very sorry for all your troubles but sir I believe it's time for you to see if you can find a mechanic who can help you.

JR

[ronscycle1]

i havent given up yet