A 40 hp Yamaha outboard motor typically requires a 12-volt battery, commonly in the range of 100-200 CCA (cold cranking amps) for reliable starting and performance. A Group 24 or Group 27 battery size is often recommended, depending on the specific model and usage. Always refer to the owner's manual for exact specifications and recommendations.
What size motor is
400 cc Yamaha engine
70 hp 1994 yamaha
g103e-00428
YES
Standard 6 volt motorcycle battery aabout $50 to $100
It's stamped into a tag on both sides of the motor. Just below cylinder head.
4.5 volt battery sold only in Russo
I am not sure - but the engine will say how many CCs it has on it somewhere.
The displacement is stamped on jug at the bottom it will be #'s followed by cc.
325 cca
5lb battery