Engine Redlines / Revs out of Control! - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
Small Engine Repair Discussion Talk about issues or tips you may have for others regarding small engine repairs.

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post #1 of 13 (permalink) Old 02-14-2020, 07:55 PM Thread Starter
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Engine Redlines / Revs out of Control!

I've got a Scotts's L2048, which is really just a John Deere painted orange. It has a 2 cylinder Briggs Indek mower.
I pulled it out of the barn to use it the other day and noticed a tire needed air. So I backed in and shut it down. I aired up the tires and got back on.
When I started it back up it revved out of control to the point I thought the engine would blow. I shut it down and checked the cables, linkage and springs.
Nothing had slipped and everything looked to be where it should. Started it back up and same thing. Any idea what could be causing this?

Thanks,
Rick
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post #2 of 13 (permalink) Old 02-15-2020, 01:34 AM
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Might be the throttle plate came loose from the shaft. Either that or governor problems if the linkage seems to be working normal otherwise. I would pull the carb first and see if the throttle plate is still attached to the shaft or if it is stuck in the intake someplace and the screws that held it gone missing.

Mark - 2002 John Deere LT150H

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post #3 of 13 (permalink) Old 02-15-2020, 08:47 PM Thread Starter
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Thanks Mark. Both side of the throttle plate are moving as they should when I move the choke cable. It's a 2 barrel carb and the throttle plate appears to be one piece.
I guess that leaves the governor? I've never replaced one on this model mower, but there's a first time for everything.
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post #4 of 13 (permalink) Old 02-15-2020, 10:35 PM
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Quote:
Originally Posted by Rifon14 View Post
.....Both side of the throttle plate are moving as they should when I move the choke cable. ....

Sure your not mistaking the choke plate for the throttle plate? The choke plate is near the front where the air goes in and the throttle plate will be closer to the engine past the fuel jets in the carb. Not sure you can see the throttle plate without removing the carb from the intake manifold. I'll see if I can find a manual for that. We might have it in our reference library.


Edit: Here we go, think this is the manual for it. Take a look at page 23 of the pdf file. The choke plate is one piece and the throttle plates are two piece.

See pdf file here: https://www.mylawnmowerforum.com/for...ce-manual.html


Looks like with the choke open in the run position you should be able to see the throttle plates at the back and turn the lever on them to make sure they are both closing.
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Mark - 2002 John Deere LT150H


Last edited by Mark / Ohio; 02-15-2020 at 10:47 PM.
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post #5 of 13 (permalink) Old 02-15-2020, 10:56 PM
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(Click to enlarge image. )2BCarbBriggs.jpg

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post #6 of 13 (permalink) Old 02-16-2020, 06:15 PM
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Sounds like the governor to me.
Might try adjusting it first to rule out it being out of adjustment. Before diving into it.
Plenty of YouTube videos and manuals to find out how.
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post #7 of 13 (permalink) Old 02-20-2020, 06:34 PM
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When asking an engine question it is always helpful to post the model number. Sounds like it might be a series 44 B&S. Given the circumstances, I doubt it is governor setting but a good thing to try first. I can send you a manual if you like. Early ones of this engine sometimes had the stationary shaft on which the governor runs come loose or wear out. IF that is the problem, there is no easy permanent fix and shaft is not a replacement part. I have a good block for $20 + shipping.

Walt Conner
wconner5 at frontier dot com
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post #8 of 13 (permalink) Old 02-21-2020, 02:50 AM Thread Starter
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You're right Mark, I did confuse the choke plate for the throttle plate. Thank you for the diagram, it helps a lot. I'll check it out over the weekend.
I appreciate the replies and apologize for the delay. My **** job keeps getting in the way.
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post #9 of 13 (permalink) Old 02-21-2020, 02:54 AM Thread Starter
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You're right Walt. I should have included the model number of the engine. It;s a Briggs 20 horse Indek V Twin. I'll try to get the model number over the weekend. Thanks for the help.
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post #10 of 13 (permalink) Old 02-21-2020, 01:53 PM
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Quote:
Originally Posted by Rifon14 View Post
You're right Walt. I should have included the model number of the engine. It;s a Briggs 20 horse Indek V Twin. I'll try to get the model number over the weekend. Thanks for the help.
Well that ls probably a 40 series then.

Walt Conner
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