Weird starting issue

[antsinmypbj]

I need to pick someones brain. I'm having a weird problem with my scooter. I can kick start the scooter and it runs fine but when I try to use my electric start, nothing. here's the weird part, If I hook up my battery jumper, the electric start works immediately and the scooter starts. I had my battery tested and it was fine. I also tried a new battery I had in another scooter and its still is having the same issue. Thoughts? 

[scooterpimp]

Check for possiile bad/loose ground connections? We are holding the brale lever to start? (Had to ask)  possible weak / bad cable or connection?  Starter relay?does relay click? Or nothin?  Just tossin some ideas out there. time for some multimeter tests..

[tocoo]

Yeah I struggled with electric start too, but mine at least make the starter works. I after I checked the jets, the mixture screw and the fuel enricher on the carb, I decided to lower the gap on the spark plug. THe manual says the NGK spark plug must have a gap of 0,6--0,7mm, but I tried 0,55mm and it seems to work well.

Anyway, always fully kick a few times and leave the kick at the position where you feel a resistance, then start with the battery.
If the electric starter makes no noise, then you can replace it for 20 USD after checking the wires of the scooter and testing it directly on the battery. you can disassemble it if you want, but it is awful to assemble afterwards.

[GrumpyUnk]

antsin the jelly:

Where are you doing the jumpering? Directly to the starter? To the scooter battery terminals? The relay?

It seems these things are easier to start if you leave the throttle alone when pushing the button. I think that opening the throttle allows the higher speed sections of the carburetor to try to work, and they don't do well at lower cranking rpms. That means the idle settings must be correct or it will be difficult to start. FWIW.
tom