battery for a 9.9

[saltysenior]

my battery box size is for a lawn mower type battery..... the tired battery has no info on it. how many c.cranking hr. battery should be used for a '90 ,9.9 Johnson??

 

[H20Rat]

Whatever fits in the box... You could start that engine on a couple D cell flashlight batteries.

 

[MH Hawker]

That should pull around 75 amps so a lawn mower batt would work but it wont last for a lot of cranking, but you can pull start it if needed.

 

[steelespike]

I use a heavy duty 340 CCA lawn mower battery in my 61 Corvair. A battery to fit the battery box is around $100.
This costs about $50. The car starts instantly even after sitting for weeks. I do keep a maintainer on it because it does sit for extended times.
It does have an after market electric fuel pump but that's the only out of the ordinary accessories.
I got the heavy duty battery because the the lighter batteries are noted for premature failure.
Your motor should do fine with something like this.

 

[airshot]

my battery box size is for a lawn mower type battery..... the tired battery has no info on it. how many c.cranking hr. battery should be used for a '90 ,9.9 Johnson??

That little motor will not take much to crank it over, a motor cycle battery would work fine if size is an issue. My full size ATV runs on a motorcycle battery and I run all kinds of 12v accessories from it. I recently purchased a sealed lead acid battery for my grandkids electric ATV riding toy, smaller than a lawn mower battery but has more cranking power and is a deep cycle type of battery. Cost was 36 bucks including shipping, it runs twice as long and faster than the original atv battery at half the price. One of these should work fine.