1. dirty carbs
2. dropped spark in one or more cylinders
3. fuel pump went bad, sending fuel into the pulsateing hose,
or low fuel pressure
4. blew a head gasket
5. water in fuel or old/dirty fuel
6. kill switch pulled
7. overheated, burned up
8. bad primer bulb
9. vro died
10.spark plug fouled
11.wire came off trigger
12.bad stator
13.ran out of fuel
This is just to name a few. good luck
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mike halfmann