Yamaha Shaft 50cc two stroke trike problem

[TXJcustoms]

After I get it to start I switch it to run

[TXJcustoms]

After I get it to start on the start setting i switch it to the run setting it runs for awhile and quits sometimes it'll set and idle for quite awhile as long as you don't mess with the throttle other times it just back fires out the pipe with a puff of smoke

[Doug8765]

Check compression


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[John Tice]

Every new to you 2 stroke needs a compression & leak down test. If this looks OK then you’ll know that any troubles aren’t from the cylinder
JT