Harley Topper Data

Data

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FACTS or MYTH
about Toppers

How to identify model, year and serial
number of your Harley Topper:

Serial Numbers stamped on the engine identifies the year,model & production numbers: Example: 60A27**
Year would be:1960 , Model would be: A , Production numbers would be: 27**

Serial number stamped in the boss on top left of crankcase

Model Size of the Harley Topper Scooters 1960 to 1965 Two Cycle Engine

All Topper engines used a Reed Valve Intake (the same reed plate assembly was
used on all models A, AU, AH.
The AU used a smaller-based manifold and
the A and AH used different air intake manifolds with the reed valve setup.)
When the Topper is stopped, the transmission will not take hold over 1800 rpm.
(The piston and rings are the same as the Harley lightweights
1953 to 1959 ST and 1960 super 10, 165cc engines.) some other internal parts
are interchangeable as well.

Model: A
(Little over 6 hp, compression ratio 6.6 to 1)
Note: 1960 and 1961 Riders Manual for the A, AU,
Horsepower: (N.A.C.C. Rating) 2.26
10 cubic inches, 165 cc.
Bore: 2.375 inches
Stroke: 2.281 inches
Top speed: does a little better than 45 miles per hour.
What made this 10 cubic inch 165 cc motor low in hp: low compression
head (the A and the AU used the same head), small carburetor intake passage , small air intake manifold, small air intake hose , and long low resistance muffler.
Weight: 237 lbs
Gas consumption: 80 miles per gallon, advertised to get 100 miles per gallon.
Sold new for under: $450.00
Spark plug type: Harley-Davidson no. 4 size, 14mm, Gap .040 to .045 inch
Circuit point gap: .018 inch
Ignition Timing: 5/64 (.078 ) to 7/64 ( .110 ) inches before piston top dead center.
Number of Sprocket teeth: Transmission drive sprocket 14, Rear wheel 63.
Overall ratio: Maximum 18.0, Minimum 5.9
Wheelbase: 51.5
1. 1960 and 1961 Specification sheet:
2. 1960 specification sheet:

Model: AU
( Under 5-brakinghp, Compression ratio 6.6 to 1)
Note: 1960 and 1961 Riders Manual for the A, AU,
Horsepower: (N.A.C.C. Rating) 2.26
Bore: 2.375 inches
Stroke: 2.281 inches
Same 10 cubic inches engine as the A & AH 165 cc engine.
Top speed: 40 to 45 miles per hour.
U signifies under-powered, also tagged as de-tuned or restricted.
The AU was a restricted horse power engine modified to meet the qualifications
in states with junior driver laws on engines under 5-brake hp back in the sixties.
What did they do to get the 10 cubic inch 165 cc motor to meet the under 5-brake hp requirement for some states with the junior licensing laws?
This was accomplished buy using an special smaller-base manifold intake and-
a low compression head, (the AU and the A used the same head), small carburetor intake passage , smaller air intake manifold,small air intake hose and long low resistance muffler.
The AU in 1962 sold retail for: $445.00 Dealer cost: $333.75
Spark plug type: Harley-Davidson no. 4 size, 14mm, Gap .040 to .045 inch
Circuit point gap: .018 inch
Ignition Timing: 5/64 (.078 ) to 7/64 ( .110 ) inches before piston top dead center.
Number of Sprocket teeth: Transmission drive sprocket 14, Rear wheel 63.
Overall ratio: Maximum 18.0, Minimum 5.9
Wheelbase: 51.5
1. 1960 and 1961 Specification sheet:
2. 1960 specification sheet:

* VIEW UNDER 5 HP STICKER

Model: AH 1961 to 1965 Style Master
( 9 hp 1961 to 1965 compression ratio 8:1, 165cc)
H signifies "High compression engine".
Top speed: up to 60 miles per hour.
What gives the H more horse power: High compression squish chamber head , Deep breathing big carburetor with intake passage and transfer ports to match (much more fuel gets into the cylinder) , Larger air intake manifold, Larger air intake filter , Larger air intake hose and a tuned exhaust system.
The AH in 1962 sold retail for: $445.00 Dealer cost: $333.75 same
price as the AU at the time.

HIGH COMPRESSION HEAD
Deep finned aluminum alloy
cylinder head gives the H a
compression ratio of 8 to 1.
An efficient “squish” Chamber
insures proper combustion and
gives greater volumetric efficiency
at all engine speeds.
View the differences in the high compression
AH head and the A,AU head in the pictures below.
Click to enlarge the images.

AH, Squish Head ....................................... A , AU Head
.. ... ............

DEEP BREATHING
The H has a BIG carburetor,
with intake passage and transfer
ports to match. Plenty of fuel
gets to the cylinder for top
horsepower output a real
performance extra for scootering
pleasure, gets you away from
the stop lights fast.
Larger Air intake manifold for the AH only: 27017-61

General Topper Specifications

1. Topper engines are: Horizontal 165cc single cylinder two stroke engine requiring
a pre-mixed gasoline/oil mixture - Loop Scavenged - Reed Valve Intake. Note: mix Ratio:
The engine lies in a Horizontal positioning and cooled by the air stream instead of a fan. This positioning of the engine places 42 percent of the scooters total weight on the front wheel and gives it a lower center of gravity for better balance and road ability.
The cylinder head is of a aluminum alloy and the cylinder is cast iron.

2. Bore: 1960 to 1961 A , AU ..(60.30mm) 2.375 in. or 2 3/8"
1961-AU , 1962-AH , AU ..(60.325mm) 2.377 in.
The engine is of a short stroke design: ...(57.94mm) 2.281 in. or 29/32"

3. Piston Displacement: ..1960 - 1961 A , AU , AH , and 1962 AH , AU ..( 165cc ) 10.0 cubic in.

4. Compression Ratio: 1960 -1961 A , AU & 1962 AU ....Full Stroke -6.6 to 1 After port close -5.0 to 1
1961 AH & 1962 AH ....Full Stroke -8.0 to 1 After port close -5.9 to 1

5. Harley Davidson Spark Plugs: All Topper plugs are 14mm. All plugs fit: 1960 to 1965 A , AU , AH
( No.2 32305-48A )
( No.3 32303-47A )
( No.4 32301-47A For average use "standard" )
( No.5 32307-58 )
Heat description of plugs No.2 thru 5 and trouble shooting.
Note: Alternative modern plugs replace No.3 and No.4
Spark Plug gap setting: .040 - .045 in.
Breaker Point gap setting: .018 in.
Ignition Timing: 5/16 (.078) to 7/64 (.110) in. before top dead center
Magneto Generator: Points Number: 29580-55 Condenser Number: 29578-55
Coil Number: 31600-47

6. Drive-primary: V Belt
Final Drive: 1/2 in. pitch roller chain.
Power to the rear wheel is automatically controlled by the infinitely variable drive system.
Pitch diameter of the belt pulleys are centrifugally changed from 18 to 1 (low) to 6 to 1 (high range)

7. Starting method: Pull start re-coil system...same as push lawn mower with pull rope & handle.

8. Transmission: Scootaway automatic transmission or CVT (constant velocity transmission).
Note: Transmission data: Early dry transmission1959 to early 1961...Later 1961 to 1965 oil bath transmission.
Transmission Rear Drive............Note for Service bulletin 436 & 437

Transmission Fluid
click on images to enlarge
.........
The Topper Transmission used: 12 ounces of S.A.E. 40 weight special formulated transmission fluid, although you could use the same motor oil sold by Harley Davidson at the time, available for use in the Toppers oil gas mix, only if the oil is undiluted straight from the can.
Drive cup cover plugs: 34865-61 and 34865-63

9. Tire size: Originals had a diamond pattern. size: 4.00 X 12.
The overall diameter of the Tire is 20"

10. Tire pressure: Front 14 psi , Rear 16 psi , figured for 150 pound person.
add 2 pounds in rear and 1 pound in front for every 50 pounds added.

11. Number of sprocket teeth: 1960-1961- A , AU , AH & 1962 AU.
engine 14 , rear wheel 63.
1962 AH , engine 16 , rear wheel 63.

12. Fuel capacities: 1.7 U.S. Gallons with a .5 U.S. pint reserve.
Note: Gas to Oil Mixture Ratio:
Motor oil type recommended SAE 40 wt: 91844-59
click on images to enlarge

.....

13. The front body: front fender,splash shield & floorboards are made of stamped steel. The front splash shield is sealed with a sponge rubber sealer to keep out water and dirt with in the joints.

14. The engine cover & body made of high impact resistance fiberglass.

15. Lighting: The front head light uses a 21-21 candle power bulb and has a high and low beam which is controlled by a switch located on the left floor board and is foot operated. The rear taillight is a combination tail and stop light it uses a bulb that is 21.3 candle power and which is controlled by a switch located under the right floor board and connected to a foot operated pedal on the right floor board.

16. Generator: Magneto-generator. Two Low-tension coils. One operates headlight and tail light, the other supplies current for high-tension ignition coil and also operates stop light through an added circuit breaker.
Maximum output of each coil. 3.2 amperes at 7 volts.

17. Horn: 6 volt made by "Hella" . The Horn is actuated by a switch on the handlebar.

18. Basic dimensions: Wheelbase-51 1/2", Overall Length-75", Overall Width-24",Overall Height-37",Saddle Height-30", Road Clearance-3 1/2".
Overall Weight-237 lbs.


Harley Topper Color Data CLICK HERE: color chips, paint part numbers etc.

Spare parts catalog data

Jiffy Stand
Setup

Speedometer Data

Handle Bar & cover id

Electrical Systems Data

Accessories &
Clothing

BODY TYPES:
50225-59 , 50225-59B , 50225-59C , 50226-63
MOTOR COVER TYPES:
50200-59 , 50200-59A
METAL TOOL BOX & FIBERGLASS BODY BOX TYPES:
50230-60 , 64201-62A