Quote:
Originally Posted by muzician21
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.
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If you haven't got the problem fixed pull the head, turn the crankshaft to top dead center on the compression stroke, not the exhaust stroke, and then drop the piston 1/4 inchdown past top dead center. This will take all the tension off the lifters and there should be a gap between the lifters and valves. Then take a .002 or .003 feeler gage or just a regular piece of paper .004 thick not cardboard are such and go around the exhaust valve. Eventually you will find a gap, between the valve and the valve seat about one quarter of the way around the exhaust valve. The motor will go on starting for a while, and eventually it will take 40 pulls to start it. It best to go ahead and do a professional valve job or you can lap the valves but in this case it going to take 3-4 hours. At 40 pulls you will be pulling and stretching tendons in your elbow and then you going to have something else to repair. The engine still has a lot of life, the fuel economy will be great when you get the valve lapped and shouldn't have a problem for 2-3 more years but you will have to watch this valve seat. not much fun sleeping on a sore elbow for weeks on end. The little motor will purr when you get it back
Take care