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hard start then backfire???

2002 Summit 800 Highmark. Changed the plugs today and then tried to start it up. It usually starts 2nd or 3rd pull. After about 8 pulls there was a loud POP!!! (maybe a backfire???). After the POP it started 2nd pull and everything sounded normal. Any ideas? Do I have a potential problem on my hand I need to address?
 
Might be nothing....but a common problem that shows up with hard starting is reed boot delamination. Pull the reeds and see if the rubber is peeling off.
 
Not the first ride of the season. I had put put 1:100 oil mix in the first tank and waited to change the plugs until I had mostly gotten through the first tank of gas. Tank was about 1/2 full when I changed the plugs and tried to start it up.

The popping sound it made was quite loud. It sounded like a potato gun going off- almost like something got blown out of the engine.

Thanks for all of your feedback.
 
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