Briggs and Stratton mower engine not running well


Old 08-06-15, 06:22 AM
Thread Starter
Join Date: Aug 2015
Location: UK
Posts: 1
Briggs and Stratton mower engine not running well

Hi all,

I have a Mountfield (I am UK-based) push mower with a Briggs and Stratton engine that isn't running well. The model number stamped onto the engine is: 10D902-0153-B1

It seems to stutter and is putting out more smoke lately, especially when the revs dip. The revs seem to fluctuate a lot, and dip a lot if I change the mower's direction (especially if I'm pushing it forwards and then pull it backwards).

I've attached a couple of brief videos so you can see what I mean. I would be very grateful if anyone in the know could take a look and advise. << 2nd video

Many thanks in advance,

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Old 08-06-15, 08:56 AM
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.
Here we go:

Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Check the intake tube to see if the O ring seal and plastic retainer are still on the intake tube, if so remove them and re-install them into the carb. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble), now with a small screwdriver pry out the main jet(carefully) and clean it, check the O ring on the main jet for damage, if it is damaged it must be replaced, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem(not necessary if the fuel tank was clean). Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo
Old 08-08-15, 10:43 AM
Join Date: Aug 2015
Location: USA
Posts: 1
try replacing air filter to make enough vacuum so the carb can draw fuel.

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