Briggs throttle plate always wide open - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 10-28-2017, 10:19 PM Thread Starter
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Briggs throttle plate always wide open

Hey all,

So I have a craftsman 2 stage with a Briggs motor.
I've never run it before but it wouldn't start, cleaned the carb and it fired up 1st pull.

Problem when it fires up is that it over revs and it seems as though the throttle plate is wide open no matter what position the throttle selector is in.

I took it all apart and can see that the governor linkage from the carb to the throttle selector doesn't seem to ever close the throttle plate.
I can't see that there's anything missing or malfunctioning.

Any ideas?

Thanks
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post #2 of 18 Old 10-29-2017, 01:15 AM
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Try using some PB Blaster or Fluid Film to loosen up the linkage and let it sit for a day after soaking it and then try it again.

The other issue may just be that you have a bad fuel line that will cause it to surge and or it has a lot of dirt in the fuel tank and fuel line and you need a fuel filter.
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post #3 of 18 Old 10-29-2017, 04:53 AM
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governor and it's proper linkage adjustment needs to be addressed . there are links in sections in here for shop information on how to properly adjust it,
example is if the spring is weak or in the wrong hole it will over rev. if the arm is not set to the governor by the book,it will over rev. that NO amount of lubricant will address wrongly done repairs,
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post #4 of 18 Old 10-29-2017, 09:39 AM Thread Starter
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Thanks for the replies.

I'll try the PB Blaster and see. The guy I got it from said it ran fine last year but just wouldn't start now.
It doesn't appear that there has been anything done to the governor system, it's almost like the the linkage is working backwards if that makes sense.

I'll post a video of what i'm seeing and it'll be easier for everyone else.
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post #5 of 18 Old 10-29-2017, 10:04 AM
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The Butterfly itself may be Frozen. +1 on the PB Blaster to free things up.
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post #6 of 18 Old 10-29-2017, 10:08 AM Thread Starter
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post #7 of 18 Old 10-29-2017, 11:42 AM
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The throttle lever doesn’t have a direct effect on the throttle plate. With the engine off the throttle plate should be wide open. As rpms climb the governor will try to close the throttle plate. The speed control lever has a spring that resists the governors attemp to close the plate.

It looks like everything is hooked up properly. Does the throttle plate move freely? It’s possible that the governor arm is incorrectly position on the governor shaft. Do you have a tach to verify RPMs

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Last edited by drmerdp; 10-29-2017 at 11:46 AM.
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post #8 of 18 Old 10-29-2017, 11:55 AM Thread Starter
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Throttle plate moves freely.
I don't have a tach.

I'll have to look at the arm then. It looks like everything is in place.

Thanks for the reply.
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post #9 of 18 Old 10-29-2017, 08:39 PM
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it ran fine last year but just wouldn't start now

Guys who say this cannot be trusted. Anything is possible

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post #10 of 18 Old 10-29-2017, 09:35 PM
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Quote:
Originally Posted by tdipaul View Post
it ran fine last year but just wouldn't start now

Guys who say this cannot be trusted. Anything is possible
it ran last year,but not saying how well. used car saleman bs sales line, yet really sold because of problems .

op grab a shop manual and set the governor up ,
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