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@bq
Like any 2 stroke engine combustion will be dependent on both the inlet and the exhaust sides of the engine.
The exhaust joints must be gas-tight and the system must generate sufficient back-pressure to keep the un-ignited fuel/air mixture in the cylinder long enough to ignite and push the piston down.
2 strokes are sensitive to the combustion ratio: too lean and it will run hot and seize or hole the piston; too rich and it will oil up the spark plug. It will also need periodic decoking - take the head off and check the piston is intact and clean up the piston and combustion chamber surface.
Clean up the plug or use a new one. If it floods then heat the tip of the plug right up with a fag lighter, put it back and try again.