What causes Jonway 250 scooter electrical short?

by Neal Geiger
(Georgetown, TX)

Jonway 250YY wiring digram

Jonway 250YY wiring digram

I purchased a Jonway 250YY scooter in December of 2010 through a web-based dealer many states away from me. Though I enjoy the vehicle's design and value, I continue to have small frustrating problems.

The most inconvenient is a short circuit that drains the battery while riding. Symptoms are: non-working gas gauge and water temperature gauge. Both gauges appear to be working normally when ignition switch is turned to the "on" position, but the instant the engine starts, they both fail.

The gas gauge zooms to the full position until the tank is near empty, then it appears to begin working correctly again. The water temp gauge drops to "cold" and will occasionally flutter when the throttle is revved.

On two occasions, when the battery was near dead (because of unrelated carburetor problems - I have installed 2 new carbs since purchasing) as I attempted to start the bike, the water gauge sometimes acts like a volt meter, flipping and showing drain on the system as I turned the starting motor.

I carefully studied the attached wiring diagram for weeks, then I removed all the body panels seeking a short, cross wire or bad ground. When I made sure the ground wires were well attached and I could not find a shorted out wire - I started to think it may be the CDI and/or MANOSTAT (regulator). These two significant electronic components happen to be on the same circuit as the gauges.

Anyone have a magic wand out there?

Neal - Georgetown, TX

Comments for What causes Jonway 250 scooter electrical short?

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Feb 26, 2017
bad wiring NEW
by: Anonymous

usually bad wuring from overheating loose wires in bad connections. wires unprotected from the heat of the engines that run along side and not in a jacket to keep from melting ibsukation. vibration and wires and components moving eventually breaking. strap everything down. or combination of all. The CDI should be kept in a cool place and tied down. if tgere are cooling fins. then a thermal paste should be used and the

Apr 15, 2015
great comments NEW
by: John E. O'Neill

At last I can have found something from this post Bolivian

tasty ice-cream

Oct 14, 2011
Jonway 250 short
by: Neallyb

It was recommended to look at the fuse box - it all seemed OK. I replaced all fuses with American made Buss fuses.
I even ordered a new instrument cluster, but my heart tells me it's a waste of time.

Can I trouble you snap a photo of your repair? I want to match it.

Many thanks for your input!

Oct 13, 2011
Possible magic wand
by: Anonymous

I have a Jonway 250cc as well and had some crazy electrical symptoms similar to the ones you described. My solution was to replace the snap cover in-line fuse with a spring loaded screw together in-line fuse. Solved everything. Good luck.

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