hi,
Do the valve play (cold engine)
Clean carbs and blow with air in deceleration membrane part and all others, check fuel intake valve in carb, it might be the cause as unleaded fuel may destroy the rubber on it.
Buy new one.
Spark plug change
Check spark coil
Check fuel level in carb 25-27mm if you hold it up down.
Check ignition sensor on left part engine side it may be broken and it wont work properly when engine gets warm.
Take compression of the engine, if needed.
Bye
Teneres dont often have serious problems, Im sure its a little one.
Matt
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