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Garden Tractors Discussion Forum

BS Motor rpms

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Author  [Modern View]

05-16-2017 08:40:50

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I have a Wards 42" mower with a 14 hp single cylinder Briggs. Runs fine when blade is engaged, but when it is not, or if it sits without moving, the engine oscillates (speed goes up and down). The governor arm is moving to the same frequency.

Any ideas for a cure?

Thank you.

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05-16-2017 19:54:17

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
Another thing with Briggs engines. I have found all five of mine run perfectly with Hi-Test gas. Empty the junk out of 5he tank and fill it with the good stuff. Also throw a little Sea Foam in the tank. Lastly I always use StarTron in my gas. It has enzymes that break down the ethinol. Regular gas is just crap anymore. If your carb has a main jet screw I would tell you to give it a tiny turn open a little. That is CCw.

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05-16-2017 18:59:26

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
More than 95% of the time that is caused by a partially plugged jet in a carburetor. It is usually in the idle circuit.

That engine can hold its rpm pretty well when everything functions as it should.

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05-16-2017 18:47:54

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
My experience with those engines is that they are setup to run with a load. When unloaded the timing is off a little and they hunt and misfire and all that stuff. I don't worry about it if it does it's job under load. Tecumseh engine governors are the ones that gave me fits, mechanical driven, not air pressure driven like BS.

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05-17-2017 08:17:16

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 Re: BS Motor rpms in reply to Texasmark1, 05-16-2017 18:47:54  
Agree;If it works right under load,don't FIX it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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05-16-2017 15:11:40

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
I also think its running lean and it looks like that engine has a fixed main jet so no adjustments, you can try adjusting the idle jet to see if that will help turn it out (CCW) 1/8th of a turn maybe up to 1/4 turn if it helps ok if not turn the idle jet back to where it was and try cleaning the carb good, there maybe a build up of crud in the main jet or anywhere in the carb, Good luck

GB in MN

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05-16-2017 12:19:48

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
Vertical shaft. Model Series 28E700

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05-16-2017 10:13:46

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
In most cases that is a carb problem and it could be running to rich or to lean. One way to check is try choking it a bit and if that helps then it is running to lean if it hurts then to rich. You also might try pulling the air cleaner off and see if that helps and if it does the air cleaner needs to be cleaned or replaced. And last but not least the gov linkage or butterfly maybe sticking and need to be cleaned and lubed up. Have run into where the butterfly pivots to rust up and then the butterfly sticks so the gov does not work well

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05-16-2017 10:11:40

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 Re: BS Motor rpms in reply to kleinerpiner, 05-16-2017 08:40:50  
What is the Briggs model number, is this a horizontal shaft engine?

GB in MN

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