no spark

hi peeps,i have a ajs digita 51which did not have a spark.
i have replaced the stator, cdi unit and coil and spark plug.
i do get a spark now but its not enough to start the scooter.
my battery holds 13.4volts .when i hook it up to my car battery it starts straight away.
do you think my ccamps on my battery is duff .
thanks for looking

 

Hello allan what is ccamps mean please?

 

cold cranking amps

 

scuba, any ideas?

 

Put a 5ah battery in there instead of a 4ah one (I'm guessing it's 4ah)
Does it turn over much faster when you jump it?

 

there is a 9 ah in it at the moment. and yes when hooked up to car battery you can hear the difference

 

there is a 9ah in it at the moment and yes there is a big difference in the sound when hooked up to the car battery.

 

Can you get a 10ah?
How old is the battery?
And how much does it drop to when you are turning it over?
I actually cut my teeth so to speak being a forklift mechanic so I'm pretty good with electric motors.

 

it drops about volt. but sound it makes is like it's just spinning not enough grunt to start it.
i don't know how old the battery is.
ive tried to upload a pic but the file is to large

 

I've now uploaded a pic of the battery label

 

Never even heard of that brand before.
Try a new battery.
If it's still giving you trouble I would be looking at the starter motor or starter motor cables.

 

it's a powerline battery from the internet
i will get a new one.
cheers

 

had the battery checked out and its OK.
holding 12.9v and cranking amps 150

 

What's the voltage drop when it's starting though?

 

will check when on bike today

 

dropped from 12.9to 10.9v

 

Yeah that's substantial....