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Getting my scooter to spark the engine to start the motor?

My scooter is 2008 Sunl Venture scooter with a 157 QMJ engine.?
It seem to have it days of starting up with no problem. When I ride it to my job for some reason after I park it in the garge at work. I have a problem with it starting up. Why that I don't know.

I just change the oil and the gear oil on Monday and it was starting up great without any problem. I change the spark plug and it started up without any problem.

This morning started up without a problem. I go out for lunch to ride around. It wouldn't start up.

A menchanic charge me $135 and told me that the charging system is charging up and the battery is very good.

What can be the problem? I don't trust the scotter any more. Someday it starts. Some days it don't.

Please, can some one help me please.

Craigco
May 2009

Craigco
May 2009

Vehicles, Motorcycles Engine Start Motor

Hi
Does your scooter have a kick start?other than an electric start. If the engine turns over(with Electric start) at all then its not a starter motor or a solinoid.
Check the engine timing is spot on maybe something has drifted.
if no spark at all its something to do with spark side. older bikes used points and a condensors. newer bikes use CDi units, check that the pick up sensor is perfect condition and has the correct resistance.
Without being able to c the bike its a process of elimination. Sorry i cant shed more light for you.

Busa Boy
May 2009

Yes I used NGK C7HSA spark plug and the engine is a 157 QMJ 150 cc 4 storke. Since I have post this problem, I have brought a new Ignition coil and a CDI and replace them.

After I install them I still didn't get a spark out of the spark plug when I ground it aainst the metal frame of the scooter. I'm going to buy a starter solenold to see if that could be a problem as we. Any other suggestion that you think might be the problem? I do thank you for the info you gave too me.

Thanks,
A

Art
May 2009

Is your scooter a two stroke(2 Cycle) engine,cause i've never heard of that make.
Stupid question has the scooter got the correct heat rating of spark plug, cause usually you get a normal plug and one cooler and one hotter. Another stupid Question are u using a Nippon Denso(ND) Sparkplug or NGK, I have always found ND plugs crap in motorbikes and lawnmowers,causing the symptoms you describe.
your problem sounds sparkplug or coil problem.

Busa Boy
May 2009