Briggs engine

phil-usaApril 11, 2010

Ok. I had a problem with the flywheel ring gear. With help from this site, I have replaced the ring gear and flywheel. This is the 2nd time. First time, when I attempted to start the engine, the square key sheared off, I used the old one.

It took me awhile to find a replacement key. I got a square key and cut it in half to fit. All back on and the engine started.

OK, the teeth on the old fiber ring gear broke off so many that the starter cold not engage long enough to start the engine. This occurred back in October 2009. At that time the engine was running fine, no problems.

OK, NOW, the engine will start, new aluminum ring gear works great, but when I release the clutch or push the throttle up to fast the engine shuts down. This is a Craftsman LT4000 with a Briggs 15 HP OHV IC Gold engine with auto trans. Model number 28N707. I would appreciate any help that anyone can give me, as the lawn is starting to grow.



Well I have the flywheel back on the mower. I had to get a square key from Ace Hardware and cut it in half for the flywheel. Put it all together and engine starts fine, but now another problem. This mower has been parked in my garage since, I think about the middle of October 09. It was running fine when the teeth stripped from the ring gear and it would not turn the engine over enough to start. Now it turns over fine with the new aluminum gear and starts instantly, but when I release the clutch or push the throttle to fast, the engine shuts down. Sounds like it does when you turn the key off, like flooding the engine. Do you have any clues to what my problem is now.



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I'd try disconnecting the ground wire that comes out from under the flywheel cover, and try it then. It will be the wire without the bulge in it. (The bulge is in the charging diode wire)
And, there could be dirt collected in the gas tank, and flowing into the fuel line and carb. Or dirt in the carb jets, Or a disintegrating fuel supply hose. Or a bug egg in the gas tank cap breather hole. Check the seat switch, by sticking a piece of cardboard, or a stick in it to keep it open. Did you clean the legs of the coil, and the flywheel magnets. Take it off, sand the coil legs, and the magnets on the flywheel, then reset the coil leg gap, using a business card to get the correct gap of the coil to flywheel setting. (Might sound "hokey" but thats how it is done by us semi-experts! I've tried the thin guages that mechanics use, but they are frustrating to use.)
Check that the clutch safety switch hasn't fallen away from where it is fastened on.
On one of those Briggs, which foiled all of my attempts at making it run, i installed a switch in the wire i mentioned above, to shut down the engine. Also, if it has the fuel shut-off thing on the carb bowl, make sure it clicks. It might be stuck with gummy gunk from sitting. It can be removed and cleaned. Best to check it, and fix it if possible--those switches are plumb expensive! $80 was one price i have heard! I'd think that might be your problem, as gasoline will tend to gum up, and make that switch stick, only allowing fuel to seep into the carb bowl, instead of flowing freely!
Got to go! Going Bluegrassin' this afternoon!

    Bookmark   April 11, 2010 at 11:14AM
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I too changed plastic flywheel to aluminum. It ran ok untell gas mixed in with oil. put new carburetor on, now its hard to start wont stay running, rpm with more gas does not rev up. Engine dies, backfires, exhust system gets hot and smokes. won;t idel with dying. Any suggestions need help please.

    Bookmark   April 16, 2011 at 9:51AM
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