How much horsepower was average for early 1900s Motorcycles?

Here are some examples that I found (maker, year, engine capacity, power)-

Adler, 1902, 370cc, 2.5 HP

AJS, 1910, ?, 2.5 and 3.5 HP

Ariel, 1913, 499cc, 3.5 HP

BAT, 1904, ?, 2.75 HP

BSA, 1909, ?, 3 HP

Calthorpe, 1909, ?, 3 HP

Douglas, 1913, 348cc, 2.75 HP

FN, 1905, 300cc, 2 HP

Harley Davidson, 1909, 800cc, 7 HP

Hidebrand & Wolfmuller, 1894, 1428cc, 2.5 HP

Indian, 1901, ?, 1.75 HP

Matchless, 1912, 770cc, 5 HP

Minerva, 1904, 345cc, 2.75 HP

Raleigh, 1903, ?, 3 HP

Rex, 1900, ?, 1.75 HP

Rover, 1903, ?, 3.5 HP

Royal Enfield, 1901, ?, 1.5 HP

Scott, 1914, 532cc, 3.5 HP

Simplex, 1911, ?, 6 HP

Triumph, 1902, ?, 2.25 HP

Wilkinson, 1903, ?, 2.75 HP

It's not a good random sample of all bikes produced at the time, Just a summary of bikes whose power rating, I could find.

It seems that in the first decade of the century, less than 10 HP was the norm.

That relies upon on the place you're. In places like India and China, small displacement 100cc or so motorcycles are everywhere. they are much less high priced, good transportation for them. 20hp In places like Europe, you detect greater scooters and new riders are limited to small displacement motorcycles, so there are greater small displacement motorcycles - perhaps 2 hundred-300cc engines. 30hp or so. in the US, we are in a position to bounce on the latest superb of something the on the spot we get our license, so we tend to decide for the great motorcycles first. Scooters at the instant are not conventional in the US (via eu standards). So the universal engine length is in all probability plenty nearer to 1000cc. so some distance as HP, quite some individuals in the US holiday cruisers. maximum inventory cruisers have under 100hp, throw in each and every of the mid-variety established motorcycles and additionally you likely have an universal HP score of around 90HP.

Yeah it was very low. In 1915-1923 Triumph was making a 499cc motor in "the trusty" model H that made a mere 4hp.

The 1909 HD Model 5-D was a 49.5 cubic inch (811cc) that produced all of 7hp.

Sometimes? They usually had hp in single digits! My friend's 1915 BSA is 556cc and 6hp!