Problem with carburater, throttle

[DocMower]

Hi everybody,
first of all, sorry if I misuse any words here - I am no engine specialist and don't always know the specific english words.

My mower has a Briggs&Stratton 650 Quantum motor (190cc), Engine model 124T 02 6567 H1 (2011 model).
Problem is that the engine started stuttering and shut down as soon as the mower got hold of some lawn. I switched the spark plug and also the ignition coil which solved part of the problem.

But the engine still wouldn't run smoothly. Therefore I checked the throttle and the carburater. I found that there's a problem with the connection between the plastic arm that controls the butterfly valve and the metal arm that reaches out from underneath (see photos). I tried re-aligning these and got them to work again, so the engine would run much smoother and won't shut down anymore.

But I am not sure which is the correct way these two parts have to be aligned to each other. Maybe one of you has a drawing or a photo of how they are supposed to look.

Thanks and greetings from Germany
Rick

 

[Midniteoyl]

Hi everybody,
first of all, sorry if I misuse any words here - I am no engine specialist and don't always know the specific english words.

My mower has a Briggs&Stratton 650 Quantum motor (190cc), Engine model 124T 02 6567 H1 (2011 model).
Problem is that the engine started stuttering and shut down as soon as the mower got hold of some lawn. I switched the spark plug and also the ignition coil which solved part of the problem.

But the engine still wouldn't run smoothly. Therefore I checked the throttle and the carburater. I found that there's a problem with the connection between the plastic arm that controls the butterfly valve and the metal arm that reaches out from underneath (see photos). I tried re-aligning these and got them to work again, so the engine would run much smoother and won't shut down anymore.

But I am not sure which is the correct way these two parts have to be aligned to each other. Maybe one of you has a drawing or a photo of how they are supposed to look.

Thanks and greetings from Germany
Rick

Welcome! Where at in Germany are you from?

Heres how to hook up the springs. The parts you are looking at is called a 'governor' and they keep the RPMs up under load.



Basically, the long end of the spring goes in the loop on the throttle, not on the shaft part as you have it now. If you need to change the RPMs under load, you bend the little tab the big side of the spring is attached too.



https://www.youtube.com/watch?v=zDwpV8jhlzc

 

[DocMower]

Thanks, I will try your solution. Could you take a loom at the photo attached - is this the right way these two components should be attached to each other? They tend to get loose after some time, so I was wondering whether this was the right way to connect them or not.

 

[Midniteoyl]

Thanks, I will try your solution. Could you take a loom at the photo attached - is this the right way these two components should be attached to each other? They tend to get loose after some time, so I was wondering whether this was the right way to connect them or not.

View attachment 29127

That is the 'Thermostat Choke'. It is part of the 'Easy Start' system and closes the choke while cold, and opens it while warm. The entire metal arm goes inside the plastic. You adjust it so that when fully warm, the choke is fully open, and fully closed when cold. The adjustment is made by squeezing or opening the metal 'loop' on the thermostat arm.

https://www.youtube.com/watch?v=snDXjJ4hFBk



So, get your governor throttle spring hooked up correctly per the previous post and get the metal arm of the thermostat choke in the right spot, then squeeze the metal 'loop' so there is about 1/4" (6-7mm) of clearance between it and the governor. Pull back on the thermostat arm and when it hits the stops, look at the choke to make sure its fully open. If not, readjust the metal 'loop' until it does.

Now, run your engine and see it the thermostat choke is working by looking at the arm. As the engine warms, it should move against the governor (which maintains idle speed) and open the choke. If the arm does not move, then you have a bad thermostat choke and it needs replacing.


https://www.youtube.com/watch?v=Z3XP5mz59mA

 

[DocMower]

Thermostat Choke (was: Problem with carburater, throttle)

That is the 'Thermostat Choke'. It is part of the 'Easy Start' system and closes the choke while cold, and opens it while warm. The entire metal arm goes inside the plastic. You adjust it so that when fully warm, the choke is fully open, and fully closed when cold. The adjustment is made by squeezing or opening the metal 'loop' on the thermostat arm.

https://www.youtube.com/watch?v=snDXjJ4hFBk



So, get your governor throttle spring hooked up correctly per the previous post and get the metal arm of the thermostat choke in the right spot, then squeeze the metal 'loop' so there is about 1/4" (6-7mm) of clearance between it and the governor. Pull back on the thermostat arm and when it hits the stops, look at the choke to make sure its fully open. If not, readjust the metal 'loop' until it does.

Now, run your engine and see it the thermostat choke is working by looking at the arm. As the engine warms, it should move against the governor (which maintains idle speed) and open the choke. If the arm does not move, then you have a bad thermostat choke and it needs replacing.


https://www.youtube.com/watch?v=Z3XP5mz59mA

Thanks man, I think this is the solution I was looking for. Going to try that out over the weekend. Thanks again for your support!

 

[Midniteoyl]

Re: Thermostat Choke (was: Problem with carburater, throttle)

Thanks man, I think this is the solution I was looking for. Going to try that out over the weekend. Thanks again for your support!

Let us know how it goes..