Help with Briggs-powered lawn tractor.

My Yardworks (MTD) Briggs 19 HP lawn tractor has a problem.

It started a couple of weeks ago when the engine would only turn over with problems. The flywheel would only turn 1/2 revolution, then stop. After 4-6 tries, it would eventually rotate properly and the engine would start.

The battery is strong and boosting makes no difference.

Once the engine was warm it could be shut down and re-started with no problem.

But yesterday, when I tried to start it, when it did start after 4-5 tries, there was a puff of smoke and a slight burnt smell. I couldn't see where the problem was.

I proceeded to mow the lawn, with no problem and no smoke. After sitting, though, it would not re-start - no response at all - no clicking, no noises. Boosting makes no difference.

I borrowed a new starter, but it doesn't seem to make a difference.

Where do I go from here?

The Briggs motor model # is 4077770229E1.

All help appreciated as I have to mow my Dad's 2 acre lawn and my daughter's lawn, too in addition to my 1 1/2 acre.

Too, too much for my push mower, even in my younger days.

 

A bit more info: the smoke/smell came from the front of the tractor. The solenoid is back under the seat, so I didn't think it could be the problem.

 

You'll need to check the seat pressure switch for continuity when depressed, then proceed to the solenoid to make sure it is getting power via the ignition switch. The compression type reaction you were getting when turning it over could be from a stuck valve. I have had good luck with PB Blaster's Lawnmower Tune up spray. If you should get it started again, remove the air cleaner, and with the engine at a pretty good rev, spray the PB into the intake. It will want to stumble, so let up occasionally. It will also smoke and kill all the mosquitoes for a bit, but it seems to loosen up valves and clears a bunch of gunk on pistons when I have used it.

 

You need a valve adjustment Bar none. ~!~!~!

It is a common thing ~!~!