1. remove all plugs. will engine turn over easily with hand crank? If not at all, pull the starter and try again. If still stuck w/ starter out, pull the valve cover and ck for a stuck valve. If all valves are free, and engine will not turn over completely, visually inspect inside cylinders for debris.. (acorns, or whatever.)
2. If engine DOES turn over by hand, but not by starter, and starter cks good, and battery is good, clean all electrical connecttions, including disassembling switch and cleaning contacts. A short length of heavy gauge wire can be used to "jump" the switch terminals to ck it...
3. Once engine is turning over, ck for spark. Do you have a magneto or distributor? If its a mag, either it works or not.. if its a dist, ck as previously said, for voltage. Clean points and ck again for spark.
4. If you have spark, and engine turns over, ck timing. Remove #1 spark plug and ck for spark as #1 comes up to tdc.
5. If all that works, check compression w/ a gauge. It should be around 100lbs or so, but should start even as low as 60 or so. (perhaps lower)
6. If you have compression, spark at the right time, its time to see if there is fuel. Does it flow from the tank? Is the carb gummed up? There are a bunch of things that can be wrong here, but until you do more diagnosis, (and probably disassembly) its tough to solve the issue on a forum. Good luck, and don't give up. You'll find the problem, smack yourself in the forehead, and then go, "Whew.... why didn't I see that before!" :)
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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