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Hard starting Briggs & Stratton 3.0 hp lawnmower engine
muzician21 wrote in
: 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. Try this: it won't cost you anything and it worked it my case. In fact I have to do it every year due to poor quality gas. First drain the gas tank completely along with the hose to the carborator. Next either *temporarily* plug or otherwise stop any ability for liquid to come out of the hose. Vice grips on the end works fine if placed right. Leave the hose attached to the tank however and remove the tank from the mower. Put about 1 cup of Varsol into the gas tank. Screw on the lid for the gas tank so it won't leak. Shake the tank vigoursly for about a minute or so. Drain the fluid from both ends - the tank and the hose. After a years mowing the filter at the bottom of my gas tank gets so clogged with gunk that it changes colour from silver to black. You can check by draining the tank and looking at it carefully if it's visible. I went for two years having to start it with ether the first time every year. Even took it in for service with no improvement before I figured this out. Now it will start on choke first pull when it's 45 degrees F. Every time. |
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