TROUBLESHOOTING ONE-CYLINDER 
 ENGINES
  
 Living on a farm, homestead, or just a small country estate,
 we often find much of the repair work falls on us. Home
 repairs, appliances, and oh Lord, that ever-present one-
 cylinder engine.
  
 One-cylinder engines are most common in sizes from 2 to 12
 horsepower, carrying with it the same basic characteristics
 of any gasoline engine. Trouble-shooting the one-cylinder,
 however, is somewhat different from the 4, 6, or 8-cylinder.
  
 When larger engines (those in autos with 4 or more
 cylinders) are having problems, they will usually run. Not
 always smooth, but they run. The one-cylinder, when
 something is wrong, may not even start, let alone run. For
 that reason the one-cylinder engine is a harder one to
 trouble-shoot.
  
 Trouble-shooting the small engine, if you know how, can save
 you quite a bit of your hard earned cash. Usually when one
 doesn't start we buy a tune-up kit when it needs nothing more
 than a new plug. Worse yet, the plug may just need cleaning.
 If we decide something is wrong withe the carburetor we
 usually buy a new one. Needless to say, much of the work
 and expense that goes into the repair of a small engine is
 unnecessary. We work by trial-and-error until we've spent the
 price of a new engine and then take it to a mechanic who
 works on it for 20 minutes and charges us for a full
 hour at $24 per hour or more - just for labor!
  
 Another important thing to remember about a small engine if
 you live close to a small town is it's sometimes a hard one to
 get repaired. Even though there are more mechanics today
 specializing in small engines, there are still towns that don't
 have a single small engines mechanic. Auto mechanics
 usually don't work on lawn mowers or power chain saws.
  
 There are only two things that a small one-cylinder engine
 must have to run. It must have an adequate supply of fuel,
 and the fuel must be getting into the engine. Then there must
 be an adequate supply of ignition spark. These two points
 are known to mechanics as "gas and fire".
  
 First, let's take a closer look at the gas. Before you go a
 single step farther, find the air adjustment valve on the
 carburetor. Turn the screw to the right as fall as it will go. Now
 turn it back to the left 2-1/2 turns. If the carburetor works
 function at all, it'll work right there.
  
 To test to see if the carburetor is getting gas, remove the air
 breather. Set your troddle of choke (or start) and pull the rope
 starter. Look into the top of the carburetor. If gas is visible it
 is unlikely that the problem is with the carburetor. If you think
 the problem might still be gas, try this one. Using the palm of
 your hand, cover the opening on top of the carburetor. Pull
 the rope starter again. Pay close attention (by feel) which
 way the air is going through the carburetor. Is it sucking your
 palm into the carburetor or is it trying to blow it out? If it
 blows, you have problems with your valves. Chances are one
 of them is burned and will need replacing - a charge of $100
 or more if you take it to the shop but less than $20 if you do it
 yourself.
  
 The next point to check if the engine still isn't running is the
 fire. The fire consists of the coil (or magneto), the breaker
 points and the plug. A coil will usually outlive the engine
 twice-over. The points and plug, however, are a different
 story. They usually need replacing at least one a year - call it
 an annual tune-up.
  
 To check the points in the engine, remove the plug wire. Hold
 it with insulated pliers about 1/4 inch from the end of the plug.
 Pull the rope starter. If the points are breaking properly, you
 will be able to see the spark as it jumps from the wire to the
 plug. If no fire is seen, replace your points.
  
 When you check the wire, there might be a spark coming to
 the plug. If it is getting to the plug, it is possible that it isn't
 getting through it. Remove the plug from the engine. Put it
 back on the plug wire and pull the rope starter. Be sure the
 plug is grounded against the engine. If no fire is visible
 coming from the end of the plug, replace the plug with a new
 one.
  
 The small engine is popular all over the world and will be with
 us for many years to come. You would do well to learn to fix it.