This was awhile ago....but, when you're checking for a ground...you want the key in the off position. This lets you know if short is while the kart is off. I've had this happen to me a few times. I would like an update to see how things worked out. Thanks!
Compression?...all you need is a compression guage, pull the spark plug and measure your compression while trying to crank the motor. Find the specs on what it's supposed to be. Next, add a bit of oil to the inside of the cylinder, and test your compression again. If it's higher, then....alas, you have bad compression and your rings are wearing down.
Let me know the update
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