Bicycle Motor Spark Problem?

buttburn · #1 (**permalink**) 03-10-2008, 08:57 PM

Well I got my Starfire 48cc engine on my cruiser. Well I hooked the magneto to the two matching wires (leaving the white wire off.) I then hooked up the little button coming off of the throttle to the white and then grounded it to the frame, as a kill switch. Well I ran the bike, but it doesn't run well. Sounds like its not detonating right and the button doesn't work. Well I unhooked the button wire from the white and ground and the bike wouldn't even hit. Hooked it back up and it ran the same. I can only get up to about 10-15 mph WOT and I'm sure something's up with the spark. I also replaced the stock wire off the magneto with a performance one from Cruiser and used the NGK plug. Any suggestion? Is my plug gap wrong? My plug reads a light brown, so I'm thinking carb is okay?

Pablo · #2 (**permalink**) 03-10-2008, 09:09 PM

Is the engine new? Or did you take it off a different bike? :confused: (was it running well before)

Sounds like a flaky connection in a way, but also sounds like wrong wire hookage.....are you sure the white wire is your huckleberry?

deacon · #3 (**permalink**) 03-10-2008, 09:09 PM

Okay what color wires do you have from the motor.

**Ilikeabikea** · #4 (**permalink**) 03-10-2008, 09:13 PM

On mine the white wire is to run the lights. Mine has a blue and black wire for the ignition. But yours may be different...................

buttburn · #5 (**permalink**) 03-10-2008, 09:18 PM

Brand new old stock of 2006 GruBee Starfire.
I can't be sure as of now since its dark outside with the bike in my barn, but from this picture it looks as if Blue going to Blue from Mag. Black going to Black from Mag. Red from throttle to White from motor. Other wire from switch grounded by clamp of Mag. I did have to put some electrical tape on the carb where it connects to the manifold to shim it because it wouldn't secure itself.

Pics:

**Ilikeabikea** · #6 (**permalink**) 03-10-2008, 09:39 PM

Hook the two wires from your kill switch to the black and blue wire from the coil. Don't hook the white wire to anything. It is for lights. I bet that will fix it.............

buttburn · #7 (**permalink**) 03-10-2008, 09:45 PM

Quote:

Originally Posted by Ilikeabikea

Hook the two wires from your kill switch to the black and blue wire from the coil. Don't hook the white wire to anything. It is for lights. I bet that will fix it.............

*slap* doh, man so the magneto doesn't have to run off any of the wires from the motor? What are the 3 wires from the motor for ?(I know that the white is accessory) So basically the wires from the magneto are for the killswitch? Although the kill button only has one wire to hook up (red) and a black that is a ground with a loop.

**Ilikeabikea** · #8 (**permalink**) 03-10-2008, 09:50 PM

I just plug the two kill switch wires in the connectors where the engine wires hook to the coil. When you push the kill switch it grounds them together and kills the engine. You can hook the blue and black from the engine to the blue and black on the coil and it will run. But then you don't have a kill switch.

deacon · #9 (**permalink**) 03-10-2008, 09:54 PM

No the blue wire goes to the blue cdi wire and to the kill switch wire. It is a three wire bundle. The black wire goes to black cdi as does the ground wire from the kill switch. EVerything is wired to the magneto. Try that and see if it wont solve your problem/.... Sometimes the wires are not the same on the magneto and the cdi but black is always black and the other two are some other color. Just wire the kill switch to the cdi wires.

Also make sure the white wire doesn't get grounded by accident it will definitely kill the engine if it does.

**CRUISER** · #10 (**permalink**) 03-10-2008, 10:18 PM

i think i covered most wireing here. see if this helps How to wire Chinese 2-Stroke bicycle engine