There are many problems with small engines that can make them hard to start. The carburetor is one of them. Make certain that you have adjusted the new carburetor correctly. A good place to start is 1 1/2 to 2 turns counterclockwise from the closed position on the main fuel adjustment needle. Adjust in or out to best performance when engine is running. Some carburetors also have a fuel adjustment needle for the idle mixture. Start off with 1 to 1/2 turns counterclockwise from closed and adjust in or out to best idle performance. Other potential problems include bad spark plug, ignition system (points and condenser in your unit?) and a defective intake and/or exhaust valve.
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There are many problems with small engines that can make them hard to start. The carburetor is one of them. Make certain that you have adjusted the new carburetor correctly. A good place to start is 1 1/2 to 2 turns counterclockwise from the closed position on the main fuel adjustment needle. Adjust in or out to best performance when engine is running. Some carburetors also have a fuel adjustment needle for the idle mixture. Start off with 1 to 1/2 turns counterclockwise from closed and adjust in or out to best idle performance. Other potential problems include bad spark plug, ignition system (points and condenser in your unit?) and a defective intake and/or exhaust valve.