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Valve Specs for Briggs 31F777
Valve Specs for Briggs 31F777
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/26 08:05:56
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Re: Valve Specs for Briggs 31F777
2023/09/26 13:17:47
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Thanks bud which model is mine
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/26 15:11:57
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Towards the bottom, under the 310000: 310000OHV Single Cylinder.003 / .005.005 / .007 The last row on the pic I attached.
Attached Image(s)
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/26 15:13:35
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Look towards the very bottom of the chart, the 310000 line would be yours
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Re: Valve Specs for Briggs 31F777
2023/09/26 15:22:14
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thanks for your help bud I really do appreciate your help but I worked it out in the end. any idea I why it might have back fired yesterday on second start up fitting new carb??
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/26 16:44:59
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Perhaps some excess fuel on the muffler side..
Is it still backfiring or running fine now?
What was the original issue?
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Re: Valve Specs for Briggs 31F777
2023/09/27 13:56:18
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hi there SRTsFZ6 original issue was the carb it was filthy tried to upload pics but would not let me do it.. I installed a cheap one from a jungle website and it fired straight away. anyhow started this morning and first time it did not back fire but second time it did also has an oil leak from somewhere I can't find and tomato it of went to engaged the pot and it stalled... by the way this is not mu machine I was asked to look at it for a friend who got it from someone else so it maybe a bag of ****E for all I know as I do not know the history of the tractor.....
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/27 14:10:39
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I don't understand:
" I can't find and tomato it of went to engaged the pot and it stalled."
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Re: Valve Specs for Briggs 31F777
2023/09/27 14:34:04
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sorry mate went to engage the pto and the engine stalled
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/27 19:15:56
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Got to figure out if a safety switch is killing the engine when the PTO is engaged..
If you remove the black kill wire from the coil(s), you by-pass ALL safety switches-
Thus, when you now engage the PTO, if it works, you have a safety switch issue.
If it makes no difference, it sounds like an "engine issue".
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Re: Valve Specs for Briggs 31F777
2023/09/28 03:15:00
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do you mean the black wire on the ignition coil if there is one that is
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/28 08:30:41
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Yep, the small black wire to the coil.
When that's grounded out, it shorts out the coil killing the engine.
With it un-plugged, there's nothing short of a "carb fuel solenoid" (if equipped) not opening as that needs 12 volts to open and allow fuel to flow..
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Re: Valve Specs for Briggs 31F777
2023/09/28 08:48:30
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Thanks for getting back to me bud. Right I unplugged the wire and it worked I then cleaned it with contact cleaner and now it works but some times when I go to start the tractor without pto engaged it just clicks then second go it will start. And the other problem is the back fire band sometimes on start up and switch of could the ignition coil be bad the bill is getting high on this mower to be fair….
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/28 08:56:49
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Quote:
" without pto engaged it just clicks then second go it will start".
Sounds like the starter solenoid may be dirty internally. Or loose connections/bad connections.
When the key is set to crank, two contacts (internally) come together to complete the starter circuit. Check voltage on the side of the solenoid (should be battery voltage) and then the other side (to the starter) . You should see close to the same.
You can also, with a heavy line, jump past the solenoid (large terminal to large terminal). The starter should spin immediately.. The solenoid is cheap and they do wear out.
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Re: Valve Specs for Briggs 31F777
2023/09/28 08:59:50
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I do not know the history of the machine I’m afraid what I will do is take solenoid of and clean all terminals and all wiring to ignition switch as it right under the wheel… any ideas on popping backfire band carb adjust you think?
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SRTsFZ6
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Re: Valve Specs for Briggs 31F777
2023/09/28 09:10:13
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For the back fire, you may have a vacuum leak at the intake manifold.
Start the machine and spray brake cleaner or use a propane torch(NOT LITE) around
where the manifold bolts to both sides.. Any change in engine RPMs indicates an area that's leaking.
(brake cleaner or propane adds fuel to the leak and changes RPMs).
The other possibility is just the carberator is a POS. Aftermarket carbs are usually (IME) not as good as OEM units..
Make sure the engine fin's are clean of debris. A super hot engine can backfire when shutting down.
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Re: Valve Specs for Briggs 31F777
2023/09/28 09:14:37
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That’s great my friend I really appreciate your help I’m a it engineer but know basics about this stuff but not a lot it’s great to have people on these forums that can help others. What I might do to morrow is clean all wiring from ignition key to starter etc etc . This machine is covered in oil underneath it does need pressure washing down to be fair.. then blow it of with a leaf blower or run it hot for a while.!!!
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