US Motor Power- Model 820 HO

Today's US820 engines from U.S. Motor Power, Inc. continue a 40 year history of providing reliable power for demanding applications. U.S. Motor Power engines are simple to use, durable, lightweight and versatile.

When the requirement are a low weight to horsepower ratio and mounting flexibility in a modern compact power package, your best solution is our US820 industrial engine. U.S. Motor Power engines offer maximum horsepower per pound and per cubic inch of displacement, self-lubrication, and a diaphragm pump carburetor for complete mounting flexibility. The results dependable performance under even the most adverse conditions.

90 Day Warranty on new engines!


We have been working with US motor power for sometime now, and the latest and greatest thing we did was to get the price down on new engines. If you are interested in a new 820 HO(high output) features, they will be $550 plus shipping. H.O. features: has Hemi-head, go-cart reeds, 1" carburetor and elbow, PVL ignition, heavy-duty starter cup, D-ring Techumseh pull starter, lighting coil, .062 head gasket, and a few other features.  We do NOT use the compression release head because I don't believe it helps that much in starting, and it can create a problem if the value gets carbon on it and causes air to leak into the cylinder giving you an extremely lean fuel mixture.
It starts just as easy as a stock 820 engine, dynos at 10 H.P., where a stock Rokon engine is 7 H.P. It will run a plunger bike down the road at 40 m.p.h. You can beat a Kohler bike that is in 3rd gear while the 820 is in 2nd gear.
You have to modify the front mounting plate of the Rokon to accommodate the hemi-head by drilling a 1-1/8" hole in the plate for the new spark plug location.  A new 5/8" hole for the spark plug wire also has to be drilled in the plate  (See Figure 1).


Figure 1


Figure 2

On Albion transmission bikes, if you want the lighting coil engine, you have to modify the frame to look like the above picture in Figure 2.  The engines are also available w/o the lighting coil.
Engines include new air-cleaner assembly w/air-cleaner, voltage regulator, and copper exhaust gasket.
These engines normally sell from Rokon for $725, and from other guys for $695; that's for the 7 H.P. version, so don't be so quick to cut up your old faithful! We have quite a few of these engines out in the field and we've had excellent feedback at this point.


Horsepower: 10 H.P.
Bore: 2.531"
Stroke: 1.62"
Displacement: 8.2 cu. in. (134.0 cc)
Mounting: In any position
Cooling: Air-cooled
Starter: Automatic rewind
Ignition: Atom Module
Spark Plug: 14 mm
Cylinder: Aluminum diecast crankcase-cylinder with removable cylinder head
Cylinder Bore: Hard chrome plated
Crankshaft Output End: Options available
Bearings, Flywheel, and Power Take-Off End: Ball bearings
Bearings, Connecting Rod (Upper): Needle Bearings
Bearings, Connecting Rod (Lower): Roller Bearings
Connecting Rod: Forged Steel
Crankshaft: Forged Steel
Piston: Aluminum Alloy
Rings: Two, Compression
Carburetor Location: Variable - 3 positions possible
Carburetor Type: Diaphragm, with integral fuel pump; permits engine to operate in all positions
Fuel: Gasoline, regular unleaded
Fuel/Oil Mix: One third pint oil to one gallon gasoline - (24:1)
Lubrication: Self-Lubrication with oil in fuel
Weight: 15 1/2 lbs. - approx.

Stock engines are available or engines can be tailored to fit your specific application.



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