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I am trying to figure out a problem with a friends 150cc GY6 scooter.

The problem occurs when the scooter is warmed up. The engine will sputter and miss. It is almost like the ignition is being cut out as you are on the throttle. It will start fine, idle fine and rev when its cold. when it warms up the problem occurs.

here is what I have done.

replaced reg rectifier because it was fried now is wthin spec
new battery because reg/rectifier toasted it.
oil change
spark plug
new plug boot
tried new CDI, no change
adjusted carb air srew and shimmed needle both to rich and lean,
no change.

I am running out of options here. I have not pulled carb, but if a jet was clogged i would have problems when cold too.

I have not adjusted the valves, but again, I have no reason to believe they are out of adjustment because the engine doesn't die at idle or seem to have any compression problems.

I have one last theory and it involves a an extra ground wire on the reg/rectifier. Ther is a black wire grounded there and a green wire grounded there. I am wondering if that wire might go somewhere else??

Any help is appreciated.

there is a second fuse up by the starter solinoid. 20 amp i think. Pain to get to but it blew on mine from a similar incident. You have not blown a starter or anything else. Just a fuse.

Jim

Hello all,

I am working on a project 250B that was destined to be scrapped because of a non start issue. To make a long story short all the mechanicals are fixed and now on to some smaller details.

I have read that some people have gone to halogen lights and some have upgraded to HID.

My question for those people is this, Can you wire up 2 55w halogen H-4 bulbs (automotive style) with no ill effects???
I understand the probelm with draw on the electrical system and also the concern with the amount of heat put out possibly melting the lenses.

Has anyone done this and what are the results? I have the bulbs laying around and the plugs to adapt them. Might do HID later, ( I used a kit on my motorcycle and am very pleased) but for right now I can basically do this upgrade for free.

Everything is stock and I'm not running any extra lighting.

Thanks
Jim

you would replace and or check the stator when the battery would not start your scooter. If you ride it and the battery is dead, there is a good possibility of a a stator problem.