Good idea!!:p It's not...all the time. I checked valve clearance on both cylinders....tight, zero clearance(set at .004"). The suspect cylinder does eventually fire (checked with a heat gun on the exhaust pipes) then dies in less than 30 seconds. The spark is very weak.
Working on a Toro Model: 75754, Engine Model 139-0602
The complaints and observations are: when deck is engaged the engine "bogs" down almost to a stop but will regain rpm. Low power. Exhaust smoke. Oil in muffler outlet.
I did a compression test on both cylinders: both tested out 150-160...
The pic up load didn't up load😖
The first two numbers are 28 the next "number" looks like a 2....the balance of the digits are H07-0196-E1. Could the digit after 28 be a Z?
Got the cover off and carefully uncovered another model number....the serial number I provided initially was from the fan cowling. Probably not the original cover. Hopefully I can attach a picture...the letter after the two numbers "looks" like another number.