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Briggs & Stratton 5S & Model Y help


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  #11  
Old 11-13-2018, 02:05:33 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Briggs & Stratton 5S & Model Y help

Back when these engines were built, tetra ethyl lead was still not common in gas. Unleaded won't hurt, as these are relatively low compression (5:1), low speed (under 3000 RPM) engines. They are not high compression auto engines! No alky fuel is good, I would run high test if you use alcholized gas. SAE 20 is available from Tractor Supply, and some auto stores. You may have to ask for it if you do not see it on the shelves. SAE 30 Ok for most, if above 40F. Below that, you must use the SAE 20 or even 10W-30. DO not use SAE 30 in the WI with the oil pump - it is too thick for the pump to operate properly. Don't use the 10-30 in the summer - too thin!
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Old 11-13-2018, 09:19:08 PM
Cnew Cnew is offline
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Default Re: Briggs & Stratton 5S & Model Y help

Thank you Turbo, glad I asked- the pulley that is on the engine now definitely has it turning counterclockwise.
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Old 11-13-2018, 11:26:18 PM
Ken Karrow Ken Karrow is offline
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Default Re: Briggs & Stratton 5S & Model Y help

20 weight should be at any decent farm supply if you do not have TSC. Back in the day we used to go to the marina to get marine white gas for mowers. Dad claimed run cleaner in the little briggs. I believe it was no lead, octane was low enough that a stock '48 Chevy would knock on it when pulled at low rpm.
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Old 11-14-2018, 05:48:23 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Briggs & Stratton 5S & Model Y help

'White Gas' is like Colemens fuel - only about 50 octane. It does burn clean though. As you found out, it will knock if heavily loaded in an engine. Lucky you didn't hole a piston! Most marine engines were cooled directly from the lake or river water that was available, which made them run very cool - no thermostats like in a car. You could get away with a lower octane in a cold running engine - it wouldn't get hot enough to knock! Also, marine engines almost never get to be heavily loaded like a car engine, unless they were mated to a propeller that was too large for the engine.
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Old 11-18-2018, 07:48:01 AM
Cnew Cnew is offline
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Default Re: Briggs & Stratton Model Y help

Once a Model Y is running, what is the proper way to shut it down? My engine doesn’t have any sort of kill switch or tab that you touch to the spark plug. I plugged the air intake with my finger which worked but that doesn’t seem like a good thing for the engine.
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Old 11-18-2018, 11:52:03 AM
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Steve Kreiner Steve Kreiner is offline
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Default Re: Briggs & Stratton 5S & Model Y help

Short the plug out with a screwdriver to ground.
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Old 11-21-2018, 10:26:18 AM
Cnew Cnew is offline
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Default Re: Briggs & Stratton 5S & Model Y help

If you all are able to get SAE 20 in your area you might want to stock up. Definitely not available where I’m at. I checked TSC as well. Only straight grade they can get is SAE 30. Other than that it’s multi weight or synthetics.
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