Engines: The Whizzer motorbike most people are familiar with originated in 1946, with the introduction of the 'H' engine. The serial number of this engine is D003.

Aug 07, 2012 rebuilding whizzer h engine! Discussion in 'Whizzer Motorized Bicycles' started. Best way to start your project is to find out the serial number of the motor. Whizzer Motor Bikes - Ride One, You'll Buy One. Woodstock Whizzer Works. Fork Assembly(Early Whizzer). Jim's vintage Schwinn Bicycle information. THIS PAGE UPDATED, FEBRUARY 2. Vintage Schwinn FAQs.

Hello, Just bought a whizzer off of e-bay and have alot of questions. May have gotten burned, but I always wanted one since I was a kid, some sixty years ago. THe main question is can anyone help me with the year of the schwinn bike frame and the year of the 'H' engine? The schwinn bike frame number is 'I64780'. Everything says the didn't use an 'I' as the first letter, but it surely is an eye. A chicago fire destroyed all schwinn records before 1948. Thinking perhaps they did use the letter 'I' prior to 1948 or perhaps it is someting peculiar to a whizzer schwinn frame.

The H engine number is H-118652. The attached pictures show the bike, frame #, and engine number. Another question is where are good sources to buy the older whizzer and schwinn parts? Looking for a side cover for the belt side of the engine.

Do the new modern ones on e-bay fit? Thanks for any help you can provide. Hope I didn't buy off more than I can chew lol, Thanks, Happy. Iru Malargal Tamil Serial Episode 80 on this page. Moderator Registered: Posts: 617 Posted Hi Happy, and welcome to Whizzer city! Motor first, 'H'series yes.

1946-47 missing parts like coil magneto/guard. All still available too. Serial numbers is at the bottom hanger bracket, would make it 1951 on back. I'll need sometime, and see if I can better identify. Does the frame have belt flats for belt clearance? Rear fender also needs a cut-out also. I would get a hold of the Whizzer Service Facts Book.

It has a lot of good information! You're on to a good start. We can help with parts and information. Ray Attached Images (1.23 MB, 13 views) (1.10 MB, 12 views) (1.37 MB, 13 views). Pusher Registered: Posts: 2 Posted Hi Ray, Having trouble sending a reply.

Here goes again. The rear wheel loads from the front and no indents in the frame for belt clearance. Attached are some more pictures of the frame, rear wheel, and srpinger fromt fork.

I think I may have some repo things on the bike. The fenders are probable repop. They are crudley bent in to clear the belt and are chromed. I did order a copy of the 'Whizzer Service Facts' that you suggested.

Any recommendation as to where I should look to buy some of the missing items, such as coil, points, side engine/belt cover, etc. I have the rear axle assy torn down. The coaster ring was broken. Its a 'morrow' assy and perhaps a repo item as well. Any more info is greatly appreciated. Thanks, Happy Attached Images (990.58 KB, 18 views) (68.85 KB, 15 views) (469.61 KB, 12 views) (512.42 KB, 12 views) (450.58 KB, 12 views) (53.44 KB, 14 views) (439.26 KB, 13 views).

Well I Got This Box Full of Engine Parts and. Well I Got This Big Box Full of Engine Parts and. Well.lets see.

Look at the crankcase. On the oil sump below the flywheel there is a number cut in with metal stamps.

If the serial number starts with 'H' it is a 46/47 or early 48. (The 100,000 'H' was made in August of ‘47) If 'J', it is a 48/49.

(50,000)to November 49. 300 indicates ‘49,’50 and 51, and 700 is a 1952 model. 300 xxx 'S' and 600 xxx 'S'means it has a kick-starter. (There were only about 50,000 combined total of 300, 300S, 500, 600S, and 700 motors).Whizzer was prone to skipping blocks of serial numbers, and that plays havoc with trying to count the engines. If the head is low fin with the spark- plug hole to the left of center, and has a half- round 'F' shaped combustion chamber it is off an 'H' or a 'J'.

If the bolt holes are 1/4 inch it is an early 'H', 5/16 hole is off a late 'H' or a 'J' engine. If the head is high- fin, with a triangular combustion chamber and the plug is to the right of center, it is off a '300' or later engine. HEADS The 'H' cylinder has 3/4 inch valves.

The bottom of the intake flange is about 1/2' away from the fins. There are four cooling fins on the cylinder at the rear where the valves go up. The head bolts may be 1/4 inch in diameter, or 5/16 inch in the later engines. The intake port is.760, and the exhaust port is.675 in diameter.

(A dime will go in the intake, and will nearly go in the exhaust.) The carburetor studs are 1 5/8 apart. There is a number cast into the cylinder base on the right side The 'J' cylinder also uses 3/4 inch valves, but there is no space between the intake flange and the fins at the bottom. The intake port is.850 ( A nickel will go in).

The exhaust port is.750 (dime size), and the head bolt diameter is 5/16 inch. There are five fins at the rear. The carburetor studs are spaced for the Carter carburetors, and are 1 13/16 apart. There is no casting number on the cylinder base. The '300' and '700'.