Lawnboy=toro
My personal preference is briggs engines, I just dont like tecumseh. I invited a guy from another site to join up here, hes a power equipment mechanic. He knows his stuff, and does alot with tecumseh, so he could probably answer any questions if he chooses to register.
Id stay away from 2 cycles. They are loud and polute alot... not what you want for a nieghboorhood. I dont even know if you can still buy 2 cycle mowers! The most common thing I have to fix are small chainsaws/trimmers and occasionally a snow blower. Most of the time the carbs are just gummed up really bad because trimmers sit over the winter, and snow blowers sit over the summer. All I can say is proper care when storing these things is the most important thing! What *I* do is drain the tank, so the only fuel left is just alittle bit in the hose. I pull the plug, pour in some marvel mystery oil to coat the inside, then run the thing dry real quickly. This gets alot of the gas out of the carb and helps to prevent it from sticking. The marvel mystery oil lubricates it as it runs dry. Depending on how long it ran, Ill pour a little more in and turn the engine over by hand a few times to get everything coated. Its ready for storage. Sometimes you need to rebuild the carb with a new pumper depending on how cold it was and how long it sat, but other than that you wont need to pull the needles and clean passage ways like you would if it sat with fuel. Much better tradeoff. I follow this procedure every raceday with my 1500$ racemotor...
Oh yeah, and did I mention it smokes like youve never seen? lol But if you pour too much in, it may be hard to start
Jim