Starter won't turn engine!

[Rustyred 63]

Hi folks, I need help with a Briggs and  Stratton 12.5  hp starter/engine problem.

 

The battery is fully charged. The solenoid and starter motor are brand new. When I turn the key, the starter motor cog jumps into position to turn the engine but doesn't. Itstead there is  only a buzzing sound. You can see that the starter is trying to turn the engine but just not managing. The engine is just rebuilt and was running like a top.

 

Any help would be greatly appreciated!!!

[squonk 41,171]

Can you turn the engine by hand? Also make sure the grounds are tight. Make sure that new starter mounting bolt holes are free of paint.  You can lose a lot of cranking amps with bad dirty connections and the starter will do exactly what you're describing.

[kpinnc 12,175]

Pull the spark plug. Try to crank with the plug removed. If you have a bunch of fuel shoot out, your fuel shutoff is bad. 

 

If fuel comes out of the plug hole, your oil is also contaminated. 

[953 nut 55,394]

22 hours ago, Rustyred said:

The battery is fully charged. The solenoid and starter motor are brand new.

You may want to bench test the starter to be sure it is not defective, sometimes NEW parts don't work.

[lynnmor 7,322]

2 hours ago, 953 nut said:

You may want to bench test the starter to be sure it is not defective, sometimes NEW parts don't work.

Especially if they came from China.  I had cheap new starters that were junk.

[stevasaurus 22,771]

I'm just wondering if the starter is trying to turn in the right direction for that engine.  We do have Left and Right hand starters out there.  I think that should be stamped on the back plate of the starter.  A bench test would determine this.