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Hard starting Briggs & Stratton 3.0 hp lawnmower engine
On Sat, 23 May 2009 20:13:16 -0500, Fat Moe
wrote: muzician21 wrote: Have a B&S on a 70's era Snapper 21" pusher with an aluminum deck. I believe the engine is probably 10 years newer than the rest of the mower. Maybe 10 years ago I took it to a repair shop who installed a solid state unit to replace the points. Even with the solid state ignition it was never one-pull start, but as I recall it usually started with probably 3 - 5 pulls. Now it takes probably 20 pulls or more and monkeying with the throttle. Once it fires it runs like a clock, runs up and down the speed range fine. It's also easier to re-start once it's been running - though still not one pull. Doesn't seem to use an inordinate amount of oil, no discernible smoke out the exhaust. It gets what I'd call moderate use. I'm in central Florida so it gets run bi-weekly or so during the rainy months, not at all during the months of what passes for a winter down here. I'm mechanically inclined but not well-versed on the theory of this kind of engine. I've had it broken down far enough to remove and flush the gas tank, change the points when it had points, replace the pull rope. I've change the spark plug of course. I know it should start much easier than it does. Any suggestions where to look, what to tweak? There isn't that much to it from what I can see, so it shouldn't be that difficult. I believe this mower has a lot of life left in it. Thanks for all input. Sounds like it's time to do a little work on the carburetor. Put a new diaphragm in it if it the older type that uses those. As the motors age it's worth while to make a priming port in the air cleaner, drill a hole you can plug after starting and spray some carb cleaner in it to start it. Also check the valve clearances (those easy spin engine valve clearances are pretty critical for easy starting) and a good spark plug. Would help if you posted the engine model number. On newer ones with primer bulbs and bowl/float it's common for the main jet to get clogged over winter. Put some "sea foam" in the tank to clear out the jets and see what happens. If it has adjustable jets try setting 1/4 turn richer to see if it helps. Definitely sounds like it is starting too lean. |
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