You have pulled the plug and checked and you got a few sparks or perhaps none at all.
You have checked everything.... Now what?
The number 1 issue I have helped trouble shoot is a bad ground.
I can't tell you enough times, ground ground ground
So, you have checked the ground and you are 100% sure that ground is not a issue... Now what.
The simple test is to remove the spark plug and spin the engine over, holding the plug to ground.
You did that right?
Still no spark?
Nope... even if the system is working correctly you may still not have spark
Why?
Take a look at my test rig..
I have tested a lot of different ignition systems with this set up.
But when I tried this set up I had no spark regardless of the power D ignition system that I used.
Yes, I used a ignition system that I knew worked and had good ohm specs.
Why won't it spark????
A few years back I had a discussion with Adam Millar from MRE.
Some of you may know that Adam is a big CR500 guy.
Anyhow, he had heard that there wasn't enough RPM's running a no compression set up such as when you pull your spark plug out and test the system.
As it turns out this info is correct.
I turned this system over with the e-start... No spark.
Then I turned it over without the starter.
I removed the starter and used my impact gun to spin it just a little faster and it sparked very good.
So, you need compression to spin your engine fast enough to get it to spark.
You have your plug out to test it right?
Put another spark plug into the spark plug hole.
Be sure your test spark plug is grounded correctly then hit the e-start button again.
You should not see and nice consistent spark.
If you are still getting nothing... Check your ohm specs.
Yes, you will need a ohm meter.
You can get one for less than 30 dollars at your local hardware or home improvement store.
Here are the specs.