Tecate 3 Backfire

[JMiller]

My Tecate has been a pain in the arse to start and backfires through the exhaust at the bottom of the kick. The motor has recently been rebuilt. Is the backfire normal?

[polabareus]

The fuel air mixture may be a little lean. Does it all out backfire or let out a few little pops?

[JMiller]

The motor is freshly rebuilt, I strted it , ran it for @ 5 min.Shut it down ,for a little while than kicked started it and it fired right up. Now when I try to kick it, it wont start, but does pop at the bottom of the kick. It did backfire pretty loud one time. Maybe I should try push starting, or, what do you think? When it started for the first time it ran great after @ 20 sec.. I just put in a new plug>