B&S 675 engine won't idle

[brehm62]

Here are some pictures.

 

[Grassbandit]

My suggestion would be to go through the carb thoroughly. Give it a proper cleaning and don't forget the bowl screw hole. Get a can of compressed air and blow through all the holes/carb jets. You can also use the wire from a bread tie or a pin to poke through the holes.
With the bowl off, reattach the carb to the engine and connect the fuel line. Use your finger to manually lift and lower the float to ensure that fuel flows through. Yes there will be some fuel spilling so do have shop towel handy to absorb the splashes.
Once you can verify that fuel has a steady flow, disconnect the fuel line and put the bowl back on. Don't overtighten the bowl screw either.

Good luck.

 

[Rivets]

Please take some pictures, I'm a little confused as to which carb you have.

 

[brehm62]

Please take some pictures, I'm a little confused as to which carb you have.

Are you saying that you need more detail? I already posted 6 pictures. Look at the top of this page.

 

[Rivets]

Sorry missed those, working on second cup of coffee, quess I need to make it stronger. The larger spring needs more tension. Bending the metal plate out, where the spring is attached, will increase your engine speed. Do it in small increments as too not over rev the engine.

 

[brehm62]

The larger spring needs more tension. Bending the metal plate out, where the spring is attached, will increase your engine speed.

No, I can increase engine speed by loosening the clamp on the throttle arm and moving the arm very slightly and then re-clamping. I included an arrow in the picture to show where this is.

Do it in small increments as too not over rev the engine.

This I wholeheartedly agree with.

 

[Rivets]

That is not the throttle, it is the governor, please do not adjust here unless you have had experience. Let's back up. You originally said that the engine will not idle. It is not set up to idle. Once the engine starts, it is designed to come up and stay at full throttle. The only speed adjustment on this engine is to raise or lower the top engine speed by changing the spring tension I talked about earlier.

 

[brehm62]

That is not the throttle, it is the governor

Yes, a self controlling throttle is a governor.

You originally said that the engine will not idle. It is not set up to idle. Once the engine starts, it is designed to come up and stay at full throttle.

Yes, I did not realize that the engine was supposed to idle at full rpm. Now that I know that I can adjust the governor. In other words I should think of the mower engine more like a generator motor. Naturally this is different from any other lawnmower engine I've ever seen.

The only speed adjustment on this engine is to raise or lower the top engine speed by changing the spring tension I talked about earlier.

There is no spring tension adjustment. I can however adjust the position of the governor arm.

 

[Rivets]

You are not getting it. The governor is not adjustable. It is designed to be set once and not changed. This setting is done with the engine not running and with the throttle in the wide open position. The speed of the engine is adjusted by the tension on the spring. If this is not making sense to you, my suggestion would be to see a service tech, as by doing what you are saying is putting yourself and anyone who is around this running unit in danger.

 

[Grassbandit]

Refer to the last picture in the first series that you posted.
The governor spring is the one running front to back, or alongside the spark plug lead.
There is a small tab where it's hooked on that you can bend forward just a bit.