I've got a Coolster 6250 which has done pretty good but now I have an ignition problem: No spark. The motor turns over but won't crank. I pulled the spark-plug and held the side against the engine-block (to ground it) and couldn't see any spark at all.

I started throwing new parts at it in wild hopes of curing it:
> New CDI
> New ignition Coil (w/spark plug cable)
> New Sparkplug
> New Contact-Coil (starter solenoid)
> New Key-switch

Still no spark.

Are there some step-by-step guidelines for trouble-shooting these karts?

And it might be something as simple as a ground-cable connection ~ what's the best way to check that it's ok??

What is the minimum voltage that I need to see across the battery terminals?

I'm at a loss to make this thing run again. . .

Thanks in advance!

 

*Trouble Shooter Guide for NO-SPARK Chinese Engines

 

How does your starter seem? It could be a loose group connection I just has this issue. You have replaced all the correct parts so far in diagnosis. Check the ground on the battery, solenoid, and the the coil. I had this problem mine was ground. And then it was the starter.