OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines 8HP BriggsAnd Stratton Modelno 190702

Hi All
This motor will start but wont rev out.
Will stall after a couple of minutes.
Any ideas?
Thanks.

Did you just buy it and it is like this, or have you allways owned it and it used to run great and now it wont???


If the throttle linkages and govenor check out.
Next thing would be to clean the carb out, could be a blocked mainjet.
That would mean cleaning the fuel tank out as well and putting fresh fuel in it.

Bob.

Thanks Bob for your reply.
I have just bought mower.
Throttle linkages and governor seem ok.
Will take off carb and check out.
Any idea where i could pick up a repair manual for this motor?
Thanks John.

Bitumin, that engine is covered by the B&S engine overhaul manual:
http://www.tpub.com/content/recoveryvehicles/TM-5-4240-501-14P/css/TM-5-4240-501-14P_70.htm

You can use the Next button to get subsequent pages (there are 224 of them) or just overwrite higher numbers where the 70.htm appears at the end of the URL. You will find the carburetor diagnosis and repair for the larger engines such as yours begins here:
http://www.tpub.com/content/recoveryvehicles/TM-5-4240-501-14P/css/TM-5-4240-501-14P_114.htm

I think your carburetor will be a large one-piece flo-jet or a two-piece flo-jet, depending on the year of manufacture.

The governor information for your engine begins here:
http://www.tpub.com/content/recoveryvehicles/TM-5-4240-501-14P/css/TM-5-4240-501-14P_138.htm

If you would like to discuss this repair process as you go by continuing this thread, please post the full model, type and code for your engine, which is stamped on the air cowl. We will then know the date of manufacture, and can work through the diagnosis and rectification with you, based on the manual.

In case we end up running a "who guessed it first" on this case, your symptoms sound rather like a fuel restriction upstream of the float bowl. It would probably be due to dirt that was intially in the fuel tank but may now be either blocking the seat at the entry fitting, or jamming the needle. I'm betting against Bob in this case: there seems to be a time delay before it conks out, making me think the problem is upstream of the float bowl. (I doubt that I'm right any more often than Bob is, by the way.)

Thank you for your reply Grumpy.
The model:190702
Type:1164-02
Code:81101312
Any help would be appreciated.
Thanks John.

John, your engine was made on 13 October 1981. I think that was somewhere near the time Briggs and Stratton changed from the large one-piece flo-jet carburetor to the two-piece flo-jet, so it might have either.

I suggest you begin by looking at the cap on the fuel tank, and ensuring that it is the original Briggs one with a vent to allow air into the tank. Your symptoms are a good match for having a sealed (non-vented) fuel tank. Next, if the fuel tank cap is the correct one, turn off the fuel tap, disconnect the fuel line where it attaches to the carburetor, put a cup or clean tin under the free end of the fuel line, and turn on the fuel tap. See how fast fuel flows out of the fuel line into the tin. If it is a decent full stream that continues without slowing or stopping, you don't have a blockage in the tank or line.

Next step is to check the flow rate into the carburetor float bowl. You will need to reattach the fuel line, turn off the fuel, remove the float bowl (if you have a one-piece flo-jet), put the tin underneath the carburetor, and turn the fuel back on. Once again, observe whether you get a full flow of fuel into the cup, or a slow, more or less dribbling flow. If you have a two-piece flo-jet, you will need to remove the main jet, which screws into the left side of the carburetor at a 45 degree angle underneath, to make this check - if you are in doubt, post a picture of the carburetor and we can take it from there.

Please post the outcome of these tests.