Antique motorcycle info needed

[motor officer]

I am looking for some info on some old motorcycles. I have checked the internet and reference books but have gotten conflicting or no answers. If you can steer me to a person(s) or sources I would appreciate it. I am looking for the following info as supplied by Harley-Davidson:

A. Stock horsepower.
B. Stock weight.
C. Top speed.

For the following motorcycles:
1. 1935 H-D 74 cubic inch side-valve (flathead) motorcycle.
2. 1935 H-D 80 cubic inch side-valve (flathead) motorcycle.
3. 1936 H-D 61 cubic inch overhead-valve (knucklehead) motorcycle.
4. 1936 H-D 74 cubic inch overhead-valve (knucklehead) motorcycle.

[Motorcycle Forum]

[DrBob]

Even back then Harley did not really publish official HP figures; the way HP is measured has changed over time; and the word "horsepower" has at various times been used to refer to indicated, brake, and SAE gross horsepower, which will give three different numbers on the same engine. So there is some variation in what HP number these motors have. As originally designed none of them would run on today's pump gas without some modifications, so using today's testing methods still does not give firm numbers.

Generally the numbers given for the 61 OHV and 74 OHV are 37 @ 4800 RPM and 40 @ 4800 RPM respectively, while the 74 and 80 flatties get credit for 32 HP, with the 80 having more torque but the same HP. Some referenced place the figures at 40 and 45 for the OHVs and 35 for the flatties, but the Harley historian uses the lower figures, so I suspect the higher numbers are indicated HP, which is the theoretical max, not what you get at the crank.

Weight varied by model and equipment, which transmission you selected, what optional equipment you put on it (options included crash bars, windshields, leg shields, jiffy stand, etc) so again, there is no single answer or firm numbers. Top speed also varied. On the OHV models with the optional four speed tranny you could touch 100 MPH in factory trim, but a three speed was slower, and a specially prepared one did 136 MPH at Daytona. So again, there is no one answer, just like there is no one answer to the HP, weight, and top speed numbers for a 2011 Harley with the twin cam 96.

[Y2K]

Good info given from Dr B,I'll just add that there was no OHV 74" (Knucklehead) in 1936,the bigger Knuck came along in '41.