Cannot start tiller - GX31 engine
I have a Honda Harmony FG100 Tiller, with 4-stroke GX31 engine
It quit running last spring when primer bulb got cracked and allowed air.
When I replaced primer bulb, I've been unable to start since.
What I've done:
Replaced primer bulb
Replaced gas lines (to and from carb)
Replaced spark plug
Tested plug against engine cooling fin, I do see a blue spark
Rebuild carb with kit (Walbro WYL model)
About every 1000 pulls, I've got a burp-fire, but no continued fire or run
Tried starting with spoonful gas in both (1) carb and then (2) spark plug hole, no fire
Tried starting with carb spray starter, no fire.
I removed exhaust cover, so when pulling start pulley, I feel air come out exhaust / spark arrestor, but I also feel and hear air come back out the carb.
I'm at wits end.