^ clean carbs 1st
& leakdown before teardown( if you do) along with fixing any thing you can before.
There's a lot of horror stories that people rebuild because of the Leak and the new Rebuild blew up quickly, due to same leak!
If it ran Perfectly on last ride you might wanna get a GOOD psi tester. It's possible it blew up at the end of the ride but...
The plug in the 30 psi hole should have told you alot ( If indeed it was 30PSi)
If and when you do rebuild , do a search on Chinese parts, do not waste your time no matter how good the deal sounds. Rebuild the carburetors one at a time ( i'd do this now & try), as not to mix parts up, that is another very common mistake, when you're done and can't get it running, Along of forgetting to put that cross over tube back on
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