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hi all, i'm new here, and kind of a klutz with engines of all kinds, so be gentle with me.
my craftsman snow thrower has a 5hp Briggs and Stratton engine, so i thought i'd post here.
i was using it today. it seemed to start strong, no problems for about the first half-hour.
after that, it started to rhythmically rev and slow, rev and slow, rev and slow.
there's no throttle, just a choke lever, so i can't actually control the rpms.
any help appreciated. thanks in advance!:smile:

Try applying the choke a little at a time and see if it smooths out. If so then you will need to remove the carb, and clean it and install a repair kit. Post the model type and code from the engine so we can see what you are working on for further assistance.

orienteeer said:

hi all, i'm new here, and kind of a klutz with engines of all kinds, so be gentle with me.
my craftsman snow thrower has a 5hp Briggs and Stratton engine, so i thought i'd post here.
i was using it today. it seemed to start strong, no problems for about the first half-hour.
after that, it started to rhythmically rev and slow, rev and slow, rev and slow.
there's no throttle, just a choke lever, so i can't actually control the rpms.
any help appreciated. thanks in advance!:smile:

Click to expand...

Might try some SeaFoam per instructions on container.

WaltConner

Skip the SeaFoam and follow IL’s instructions. Sound like rebuild time.

Yes has above, time for a service to the carburetor. post model number and type so we can help you out.

EngineMan said:

Yes has above, time for a service to the carburetor. post model number and type so we can help you out.

Click to expand...

"Skip the SeaFoam and follow IL’s instructions. Sound like rebuild time."

You guys are awfully quick to jump on my suggestion to try SeaFoam. Did you miss that he said he was not a mechanic? What has he got to lose except a couple of bucks if it doesn't work before paying one of you $75 an hour to work on it? I believe he said it ran well for a while which is an indication it is a good candidate for SeaFoam.

Walt Conner

IF ....... you try the Sea-Foam route, and the results are NOT satisfactory, Then, it's most likely time to rebuild your carburetor, here's a link to a site where you can get an idea, of what's involved in the procedure, IF .. you feel confident, that you have the ability, and tools for the job, go for it, we all learned by doing ! whatever you decide, you should also, THOROUGHLY.. clean the ENTIRE fuel system, including the gas-tank, fuel lines,shut-off valve, ( if so equipped) filter, and air filter, no sense in rebuilding the carburetor if say, the tank has contaminated fuel or a clogged filter etc. and re-contaminating a clean carb.

http://outdoorpowerinfo.com/repairs/#id_briggs

... scroll down and find your carb, then check it out

ILENGINE said:

Try applying the choke a little at a time and see if it smooths out. If so then you will need to remove the carb, and clean it and install a repair kit. Post the model type and code from the engine so we can see what you are working on for further assistance.

Click to expand...

This is what ILENGINE is reffering to....

When we ask for the ENGINE information, this is an example of what we need ... THIS, let's US, help YOU !



https://www.jackssmallengines.com/jacks-parts-lookup/briggs-stratton-model-locator.aspx

Might try to google where to find my Briggs engine model numbers there are pics and videos that will narrow down your search spots. If you put these numbers In the search 536.881500 will bring up your unit. Does it look like this? .

:thumbsup:

orienteeer said:

TINKERER200 is my new best friend! Thanks to everybody for your time, but it was SEAFOAM that did the trick. Happy to have avoided the carb rebuild. Snowblower works like a charm. Thinking of what other engines i can give the SEAFOAM treatment.

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Thanks, glad it is back to running good.

Walt Conner

Walt I think I know u from another site as well. Good to see and read your posts and your doing well.

Thanks, I am on a half dozen forums but no longer do custom work and seldom post anymore.

Walt Conner

I just found this about a month ago a lot of members here for sure. Only a member here and the other one that I know u from which is the ppeten. What r some others that I can look around at. Thanks

Luffydog said:

I just found this about a month ago a lot of members here for sure. Only a member here and the other one that I know u from which is the ppeten. What r some others that I can look around at. Thanks

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Well not nice to promote competitor forums here. Contact me at address below put in proper format and remind me what you want.

Walt Conner
wconner5 at frontier dot com

I've had pretty good luck using Star-Tron fuel treatment for carburators that begin acting up, resulting in surging. Never tried Sea Foam.

The nice thing about this forum and the reason I'm here is the civility and respect members show towards each other. Even when members disagree they don't resort to personal attacks. It's quite refreshing!