1973 Cushman Truckster

Be sure to also see the article on Vanguard Engine Conversions.

Memeo instant backup free download windows 10. What Spark Plug should I use?Most references state that a Champion #7 spark plug was used for 1948 and earlier scooters. However, the Cushman manual for the model 32 and 34 published in 1943 states that the correct plug is a Champion 6M. A suitable substitute for either is the Champion D-16 and this is also the correct plug for all later engines that do not have a tapered seat.Heads with tapered seats used a Champion F14Y, which is no longer made but some Cushman dealers may still have a few in stock. A Champion RF14Y or RF14YC is an acceptable substitute and is readily available, but it is a resistor plug. Other plugs often recommended for the tapered seat head are the Bosch 6200, Champion 4011, NGK WR5, Champion 870 and Autolite 46. You should make your own determination as to the suitability of any of these alternate plugs. Be sure not to put a tapered seat plug in your non-tapered seat head or it will likely be ruined.I gap all plugs at .026. Cushman gave various recommendations for gaps over the years, .027 to .030 for the 6M, .030 to .033 for the #7, and .026 for the F14Y.If you have excessive fouling problems you can go to a higher heat range plug.A higher number plug is hotter and a lower number is colder.Many of the hopped up engines work best with a colder plug.

How can I tell if my Magneto is OK?Obtain a test spark plug like the Tool 4 sold by Cushman dealers. This special plug has a clip welded to the grounded side that you can attach to any convenient grounded object. It has a much wider gap than your regular plug.Find a location out of full sun, connect the spark plug wire to the test plug and kick the engine over normally. You should see an intense blue spark. If your magneto does not have sufficient voltage to jump the gap on the test plug it will not jump the gap on your regular plug satisfactorily when the engine is under compression.A weak magneto will cause the engine to be very hard to start and may cause it to cut out as you open the throttle. It will also cause spark plug fouling.Here is a tip that will help you. If you try to start your engine and it is very hard to start and seems to fire or backfire a lot, the most likely cause is either a weak magneto coil, a fouled spark plug, or oxidized or dirty points.It takes much more voltage to jump the gap when the spark plug is under compression so if it tends to cut out when you accelerate most likely have an ignition problem. Since the Cushman engine fires every rotation of the crank and the compression stroke occurs every other rotation, the unspent gas charge will often ignite during the exhaust stroke when the plug is easy to fire. Ninnu choodalani telugu full hd movie download. This gives the impression that the engine is trying to start. When an engine is running normally the extra spark has no effect on its operation.

What is the Best Gasoline to Use?All Cushman engines are low compression and will run just fine with 87-octane gas.Because we sometimes do not run our scooters for an extended time the quality and stability of the gas is more important than the octane.I have used gasoline that turned dark and smelled stale after no more than four to six months.I have also observed that Amoco 93 octane will stay crystal clear and appears quite fresh after twice that long or even longer and this is my gas of choice. If I am forced to use another brand while on the road I will drain it and replace it with Amoco before parking it.For extended storage I add a fuel stabilizer. If I am not going to ride the scooter for a month or moreI shut off the fuel and run the carburetor dry.I do not recommend emptying the gas tank.Unless it has been sealed it will tend to rust when it is empty, at least in humid Florida.If you have problems with your spark plug fouling mixing 20 percent 100LL aviation gas or racing gas with 80 percent Amoco 93. You will be surprised at how much cleaner your engine will be.

How tight should my primary drive belt be?In a word, it should be as slack as possible and still not slip. When you over tighten the belt you put a unnecessary lateral force on both the engine, clutch, and transmission bearings. You also increase rolling friction. Cushman used roller bearings in the clutch that is designed for use with a belt and just bronze bushings in the ones designed for a primary chain drive where there is much less lateral force acting on the bearings. Sometimes the clear liquid belt dressing sold by NAPA stores and others can be used to prevent the belt from slipping and avoid an excessively tight belt. A high quality serrated belt may also slip less. Be sure that you do not buy one of the cheap belts designed for fans and small appliances.

How Can I Get More Horsepower out of my Engine?Most 2-7/8 5 HP engines used in the Eagles can be bored out to 3 inches to give about 8/10 of one horsepower more. Before you do this you should give it some serious consideration. The added power sounds nice, and it usually works out fine, but there are reports of blocks cracking. Unless you are an expert and know how to center the bore in the engine block you should not attempt it. You can get far more increase in performance from the 2-7/8 inch engine by replacing the old lower lift cam that only the 2-7/8 inch engine used. Replacing the cam with the newer higher lift cam will increase its power to about 7.2 HP. Mill the head about .030, and using a thin 'performance' head gasket it should produce well over 8 HP.If you want even more performance just put in a Rocket or similar high performance cam and perhaps an oversize intake valve. If you install one of the extremely high lift cams like the Rocket you must check to be sure that there is adequate clearance between the top of the valve to the head and if not must be milled out directly above the valve the absolute minimum necessary to provide clearance. The spark plug will also have to be selected by trial and error to find one that seats with the electrode projection facing away from the large valve. The spark plug can never be removed or installed unless the valves are seated because as the plug is screwed in the electrode will hit the valve. An alternate is to fill in the existing spark plug hole and drill a new hole a fraction of an inch farther to the rear and tap it for a modern spark plug with a smaller threads. These modifications are not for the inexperienced, but any good engine shop should be able to do the work for you. Most shops get really excited about working on a Cushman engine.