18 HP Briggs and Stratton

[Dockerbee]

New battery, motor won’t start unless I pull one plug, doesn’t matter which one, acts as if too much compression if both plugs are In?

 

[dfbroxy]

Did you buy the correct battery. Most just buy the cheapest. Check the CCA or cranking amps on the old battery and match with the new one. Your engine requires a lot of cranking amps to start. Also post your engine make and model number for further expertise.

 

[Rivets]

Pull the dip stick and see if the oil level is high and the oil smells like gas. CCA for a twin cylinder engine should be a minimum of 300.

 

[tom3]

This an older flat head twin or a newer OHV motor?