friiy

I don't know if your Toro has a air filter..  or if it should being a snow unit....

The biggest problems I saw with 2 stokes was dust and debris in the lower end... (other than some fool not using mix)

       In lawn equipment,  poeple would often neglect the air filter on the Toro 2 cycle mowers (Suzuki engines) ...  the ingested grit would wear the govenor shaft and bushings in the case.....Otherwise they are great engines (2 stroke)...

   As far as running an engine on slope or heavy slant...  Most 2 stroke motors (chain saws, trimmers and blowers)  have Vacuum Diaphram carbs that do not have a fuel bowl to flood...  but your unit would and could flood if tipped too far  (float bowl)...  4  stoke engines can also run on slopes depending on the carb set-up and oil lube system, but such features are not cost effective for the units, also the added weight of a 4 stroke is not the greatest on a slope..

-Friiy

     Those cracks may be just "Casting Marks"... if they were cracks, they would go (I think) all the way through with nothing to stop it.  Also if they were cracks comming off the plug hole,  The spark plug would expand them as it tightened up..

Remember what you said first... It has no spark... Put it back together and check your kill switch wiring and lockouts...

Good Luck,

Friiy

Nice thrower... what did you end up paying for it?

-Friiy

Disregard looking at the valves,  That all should be good... I was assuming this was a Used engine..Take a little video of how it runs,  Idling,  mid speed and full throttle..

kinda point out what it is doing..   It is very rare that a new engine  fails,  Does this happen with both carbs? (same Symptoms).. I would try a good ND or NGK plug,  The Champ plug that is in it is a resistor plug (and the cheapest thing they make).   I have had those bad from the box at the shop.

Also, take a look at and post a few pictures of your govenor links and set up of the throttle plate,,,

Does this unit have a oil alert on it ? (low oil shut off)...

Ok..

Good Luck,

Friiy

     The magnets should be clear or past the center point of the magneto..   A Magneto only fires (all systems) at  the highest densisty of magnetic flux, called "e-gap" on the dischage of the coil as the magnets are passed/ passing the arm. 

      I don't think you have compound problems, you may have created a few ..   You seem to be in this engine pretty deep,  Are you sure you timing marks on the cam and crank are correct?

      Changing carbs? epa Carbs?....    These carbs may all fit the same engines, but the carbs are made for the same engines doing diffrent things.... Put the original carb back on..  You may have a Vent on the carb that is blocked because it is mismatched with the wrong intake manifold / gasket or the carb is trying to run position (throttle setting) that the carb is not manufactured to pull a load at.. 

     The spark plug gasket on the plug is a crush gasket,  even though they seal fairly well more than once,  they are made to only to seal once..   I bet you have had this plug off alot right?   I supect it will leak now...    Not to worry it will not effect running of the engine..  Don't change the head.. 

      Have you checked the valve seats in your travels through this engine,  how is the valve surface? or the valve guides... These issues may cause a rich running motor...

    What was the first problem you had that made you want to break into this engine so deep?  

   We need a little more info to work this out..

Good Luck,

Friiy