Small Engines (Lawn Mowers, etc.): Snapper 8HP Riding Mower, engine crankshaft, friction drive


Question
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Followup To
Question -
Model 190707. Type 2193-01.

Had been running fine for awhile.  Was laid up for about 6 months.  No spark to spark plug. I pulled the wire from the end of the spark plug and placed it onto the exhaust pipe, turned on the key, and there is no spark coming from the coil.   Changed coil & spark plug.  Using battery, the engine turns over, but will not start.  Gear in neutral, blade is all the way up, gas and oil OK.   ?
Answer -
Did you gap the coil to .010?

Remove the shroud so you can get to the coil.  Remove the small wire connected to the coil and then check for spark.

Let me know if you have spark with the small wire disconnected.
Eric


Eric:

Thank you for repsonding and providing some insight to the problem.  I did get spark with the ground wire removed, and then got spark with it re-attached.  I took the carburetor apart, cleaned it, and now it does start and run fine.  However, now the problem is in the transmission.  The mower runs fine in reverse, but with the blade engaged, I can only go very slow, and then none at all in 1,2,3,4,5.  Does this mower need transmission fluid?  I could not fine a filler hole on the deck or near the engine.  Do I need to stand the mower on end, clean the shift/clutch mechanisms?


Answer
Most of the 8 hp riders use a friction drive disc system.  There is a metal disc bolted to the crankshaft and a rubber drive disc mounted perpendicular to the metal disc.

As the engine crankshaft spins it contacts the rubber drive disc which turns the transaxle.

Most 8 hp can be stood up on there back so you can work on the drive system.  You should have a scrwe on top of the gas tank you can tighten to prevent fuel from leaking when you stand it up.  If there is no screw then you can drain the tank or remove it...most can be removed with no tools.

You should remove the battery if you stand it up to avoid leaking battery acid.

With the fuel cap tight/tank removed and the battery removed, you can stand the mower up to check the rubber drive disc.  A little fuel may run out of the carb but you can run the mower with the fuel tank off to drain most of the fuel in the carb.

Inspect the rubber disc and metal disc.  If there is a lot of rust on the metal disc remove most of it with a wirebrush or fine sandpaper.  If the rubber disc is wore, dry or cracked you can replace it fairly easy.

When you are finished inpsecting/repairing the drive system just replace the tank and battery.  I would recommend cleaning the battery cable ends and battery terminals with a wirebursh...even if you don't see a lot of corrosion there maybe some slight oxidation built up on the terminals and cable ends.  Cleaning them is cheap insurance to make sure you have a good connection.

Let me know what you find.
Eric