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[Field Marshal Dr. Opti]

I have cut away part of the plastic cover so I can get to the carb without having to undo the bolts and take it off every time.

Here is the thing.....The butterfly is closed and remains closed. By pinning it wide open with a clothes peg it finally started and ran for about 5 minutes.

Getting better.

[Kevin Wood]

If you mean the throttle butterfly it should be held open by a spring at rest.
When running a governor mechanism in the crank case or an air flap in the cooling nacelle closes it against the spring to regulate the speed. Maybe the spring has fallen off?

[Field Marshal Dr. Opti]

If you mean the throttle butterfly it should be held open by a spring at rest.
When running a governor mechanism in the crank case or an air flap in the cooling nacelle closes it against the spring to regulate the speed. Maybe the spring has fallen off?

Yes...the spring is gone, reply 37. I was told to start the mower with the butterfly closed. Which I couldn't.

[YZ250]

If you mean the throttle butterfly it should be held open by a spring at rest.
When running a governor mechanism in the crank case or an air flap in the cooling nacelle closes it against the spring to regulate the speed. Maybe the spring has fallen off?

Yes...the spring is gone, reply 37. I was told to start the mower with the butterfly closed. Which I couldn't.

You got me wondering now. 

Just been out and started my mower.    Popped the air box off and shone a torch up the air intake when the mower was cold and prior to starting it. The butterfly was fully closed (as in blocking air from entering the carb). As it warmed up it opened the butterfly to allow air in to the carb. As a double check I looked at my strimmer and the bike, which both have a manual choke. When I flicked the lever to choke, it blocked the air from entering the carb, just the same as the mower. Choke being rich, air being lean.
As a triple check I looked on YouTube. 

https://youtu.be/aNi9sJA4PFI

Incidentally, it may start without choke but will struggle to rev until warmed up. 

[Field Marshal Dr. Opti]

If you mean the throttle butterfly it should be held open by a spring at rest.
When running a governor mechanism in the crank case or an air flap in the cooling nacelle closes it against the spring to regulate the speed. Maybe the spring has fallen off?

Yes...the spring is gone, reply 37. I was told to start the mower with the butterfly closed. Which I couldn't.

You got me wondering now. 

Just been out and started my mower.    Popped the air box off and shone a torch up the air intake when the mower was cold and prior to starting it. The butterfly was fully closed (as in blocking air from entering the carb). As it warmed up it opened the butterfly to allow air in to the carb. As a double check I looked at my strimmer and the bike, which both have a manual choke. When I flicked the lever to choke, it blocked the air from entering the carb, just the same as the mower. Choke being rich, air being lean.
As a triple check I looked on YouTube. 

https://youtu.be/aNi9sJA4PFI

Incidentally, it may start without choke but will struggle to rev until warmed up. 

Thanks. That is a great video. The carb is exactly the same as mine.

With the butterfly closed mine simply refused to start, which was why I pegged the mechanism to hold the butterfly fully open. It then started. The exact opposite to what should happen it seems. Perhaps if the weather was colder the butterfly would need to be shut.

I need to get a new spring.

Perhaps my carb is running 'super rich'

[Entwood]

If you mean the throttle butterfly it should be held open by a spring at rest.
When running a governor mechanism in the crank case or an air flap in the cooling nacelle closes it against the spring to regulate the speed. Maybe the spring has fallen off?

Yes...the spring is gone, reply 37. I was told to start the mower with the butterfly closed. Which I couldn't.

You got me wondering now. 

Just been out and started my mower.    Popped the air box off and shone a torch up the air intake when the mower was cold and prior to starting it. The butterfly was fully closed (as in blocking air from entering the carb). As it warmed up it opened the butterfly to allow air in to the carb. As a double check I looked at my strimmer and the bike, which both have a manual choke. When I flicked the lever to choke, it blocked the air from entering the carb, just the same as the mower. Choke being rich, air being lean.
As a triple check I looked on YouTube. 

https://youtu.be/aNi9sJA4PFI

Incidentally, it may start without choke but will struggle to rev until warmed up. 

Thanks. That is a great video. The carb is exactly the same as mine.

With the butterfly closed mine simply refused to start, which was why I pegged the mechanism to hold the butterfly fully open. It then started. The exact opposite to what should happen it seems. Perhaps if the weather was colder the butterfly would need to be shut.

I need to get a new spring.

Perhaps my carb is running 'super rich'

or you had "flooded" it and the extra air cleared it enough to fire up??   Accelerator to the floor is the way to clear a flooded carburettor engine .... 

[Doctor Gollum]

You've flooded it then

[Field Marshal Dr. Opti]

You've flooded it then

Flooded it?

If the f*ucking thing started when I pulled the cord I wouldn't be able to flood it.

[Doctor Gollum]

Well, there's that...

The wet plug would suggest the presence of motion lotion...

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

[Tick Tock]

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

Wouldn't it be quicker in the microwave? 

[Sir Tigger KC]

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

Wouldn't it be quicker in the microwave? 

Yes a great way of testing for a spark! 

[Field Marshal Dr. Opti]

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

Wouldn't it be quicker in the microwave? 

Microwave is better for drying out a poodle or whippet rather than a spark plug.

[YZ250]

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

Wouldn't it be quicker in the microwave? 

Yes a great way of testing for a spark! 

It most certainly is.    Years ago my son put a casserole dish in the microwave...... with foil over it.    We returned home to the smell of what I thought was an electrical fire. I threw the microwave out to get rid of the smell. He said it was the best firework display he'd seen for a while. 

[YZ250]

You've flooded it then

Flooded it?

If the f*ucking thing started when I pulled the cord I wouldn't be able to flood it.

Briggs mower engines are like visitors ....... they'll go eventually. 

By contrast, I have an old Honda Izy in the garage. It hasn't been started for at least four years and the tank was bone dry. I very slowly pulled the cord a couple of times to make sure it was free and then put some fuel in it. On the very first pull it almost started but spluttered and died. On the second pull it started and ran like a good'un.    That's how they should work. 
But that doesn't really help does it.   

[STEMO]

Pop the plug in a low oven for a spell and try again. Assuming you have spark of course

Wouldn't it be quicker in the microwave? 

Microwave is better for drying out a poodle or whippet rather than a spark plug.

What is this obsession with Yorkshire? Do you really hate Lincolnsausageshire so much? You make the most implausible jumps from any subject to matters Yorkshire, if you want to move here, I can't see any reason why you shouldn't.