Engine cut out; found broken wire on carb connector?

[goltho]

Hi all,

First post, so greetings. My Mountfield (details in sig below) suddenly cut out this morning and wouldn't restart despite turning over. I checked the fuel supply which is fine, and in the process spotted that an orange-ish wire had become detached from a small 2-pin connector (other wire is black to ground) on a small cylinder attached to the bottom of the carb. I need to remove the female pin in the connector which is a pain in the armpit, as the wire has pulled out and left the small pin inside.

Anyone know what the connector is connected to on the carb? And are there wiring diagrams available?

Thanks.

 

[Scrubcadet10]

that is the anti afterfire Valve it should connect to (sometimes called fuel solenoid), when you turn the key on, 12V is sent to the valve and the plunger retracts and allows the main jet in the carburetor to open and allow fuel to pass through. when you turn the key off, your ignition coil gets grounded killing spark, and the power is also cut to the valve and the plunger blocks the main jet preventing the engine from drawing in fuel while it's spinning down and going POP out of the muffler.

Looking at the IPL, there are 3 carbs used on this engine, Ruixing (Roo Shing) Walbro, and Nikki.. could you provide the date code of the engine? it should be located where you found the model number, and have several digits.
https://www.partstree.com/models/31...upply-kit-carburetor-overhaul-walbro-nikki-3/ <---------Nikki and walbro
https://www.partstree.com/models/31...or-ruixing-kit-carburetor-overhaul-ruixing-0/ <---------- Ruixing

https://www.partstree.com/parts/briggs-stratton-699915/ <---- Nikki carb solenoid
https://www.partstree.com/parts/briggs-stratton-694393/ <---------- Ruixing
https://www.partstree.com/parts/briggs-stratton-846639/ <------- Walbro

 

[goltho]

that is the anti afterfire Valve it should connect to (sometimes called fuel solenoid), when you turn the key on, 12V is sent to the valve and the plunger retracts and allows the main jet in the carburetor to open and allow fuel to pass through. when you turn the key off, your ignition coil gets grounded killing spark, and the power is also cut to the valve and the plunger blocks the main jet preventing the engine from drawing in fuel while it's spinning down and going POP out of the muffler.

Looking at the IPL, there are 3 carbs used on this engine, Ruixing (Roo Shing) Walbro, and Nikki.. could you provide the date code of the engine? it should be located where you found the model number, and have several digits.
https://www.partstree.com/models/31...upply-kit-carburetor-overhaul-walbro-nikki-3/ <---------Nikki and walbro
https://www.partstree.com/models/31...or-ruixing-kit-carburetor-overhaul-ruixing-0/ <---------- Ruixing

https://www.partstree.com/parts/briggs-stratton-699915/ <---- Nikki carb solenoid
https://www.partstree.com/parts/briggs-stratton-694393/ <---------- Ruixing
https://www.partstree.com/parts/briggs-stratton-846639/ <------- Walbro

Thanks for the info - much appreciated. The engine code is 020808ZE.

So would the disconnected wire on that valve stop the engine from starting? Thanks.

 

[StarTech]

You need the .062 pin extractor tool. Molex PN 11-06-0002
The housing is Molex PN 03-06-1023.
The female pin is Molex PN 02-06-1103

You also need an open barrel crimper to crimp on the new terminal or you crimp at it.

Or the other option is to buy the Briggs engine wiring harness.

No need for wiring schematic has you only got ground and a switch 12v leads. Two wires.

 

[goltho]

that is the anti afterfire Valve it should connect to (sometimes called fuel solenoid), when you turn the key on, 12V is sent to the valve and the plunger retracts and allows the main jet in the carburetor to open and allow fuel to pass through. when you turn the key off, your ignition coil gets grounded killing spark, and the power is also cut to the valve and the plunger blocks the main jet preventing the engine from drawing in fuel while it's spinning down and going POP out of the muffler.

Looking at the IPL, there are 3 carbs used on this engine, Ruixing (Roo Shing) Walbro, and Nikki.. could you provide the date code of the engine? it should be located where you found the model number, and have several digits.
https://www.partstree.com/models/31...upply-kit-carburetor-overhaul-walbro-nikki-3/ <---------Nikki and walbro
https://www.partstree.com/models/31...or-ruixing-kit-carburetor-overhaul-ruixing-0/ <---------- Ruixing

https://www.partstree.com/parts/briggs-stratton-699915/ <---- Nikki carb solenoid
https://www.partstree.com/parts/briggs-stratton-694393/ <---------- Ruixing
https://www.partstree.com/parts/briggs-stratton-846639/ <------- Walbro

You need the .062 pin extractor tool. Molex PN 11-06-0002
The housing is Molex PN 03-06-1023.
The female pin is Molex PN 02-06-1103

You also need an open barrel crimper to crimp on the new terminal or you crimp at it.

Or the other option is to buy the Briggs engine wiring harness.

No need for wiring schematic has you only got ground and a switch 12v leads. Two wires.

Thanks for that. Is there a recommended parts supplier?

 

[Scrubcadet10]

Thanks for the info - much appreciated. The engine code is 020808ZE.

So would the disconnected wire on that valve stop the engine from starting? Thanks.

Yes, no power to it = the plunger stopping fuel.

 

[StarTech]

Correct, the solenoid is blocking fuel flow through the main carburetor nozzle.. The carburetor is still full of fuel.

 

[StarTech]

Thanks for that. Is there a recommended parts supplier?

I use Mouser for my Molex parts.

 

[goltho]

Thanks chaps/chapesses for your great help. However I forgot to ask: I obviously blew the small (3A?) fuse on the PCB in the process of fettling. Anyone know the part number for that please?

Cancel - I managed to read the existing fuse (6.3A 250V "T" rating)

 

[slomo]

Or solder and heat shrink it up. Not mowing with the space shuttle.