The Harley that you are talking about, it's either a 350 or a 360, not a 375.
They were originaly produced by SWM of Italy, they were bought out by Armstrong of England.
Armstrong was bought by Harley in 1986.
They were/are used by the Brits and the Canadians.
The current Armstrong motorcycle web site:
[url]http://www.btinternet.com/%7eccm.motorcycles/bikes.html[/url]
Harley does not "make" a complete 500 CC motorcycle (just like they never "made" any of the two strokes back in the 60's/70's, those were made by Arrmachie . The engine they use is a Rotax 500 CC engine. This same engine is used it the Harley 500cc flat track bikes. Ron Woods uses the same engine in his 500cc flat track bikes, BMW uses an updated Rotax engine that is a 650 in their 650 enduro bike, it has been used in the ATK and the American Dirt Bike motorcycles too.
The Rotax single cylinder family (350, 500, 600, 650) is one of the strongest and longest lasting single cylinder engines today.
Rotax web site:
[url]http://www.rotax.bombardier.com/motorcycle_e.htm[/url]
[img]http://www.rotax.bombardier.com/images/cycle_4.gif[/img]
[url]http://www.dropbears.com/m/models/harley/armstrong.htm[/url]
[img]http://www.dropbears.com/m/models/harley/images/armstrong86_t.jpg[/img]
Armstrong Military Motorcycles:
[url]http://www.euro-auto.freeserve.co.uk/index.html[/url]
Buell Motorcycles (of which Harley is a 51% owner) makes a single cylinder 500cc motorcycle. It is basicly a sportster engine with the forward cylinder removed and a counter balancer in place of that respective connecting rod.
There is no way that the Buell Blast could be mistaken for a military dual purpose motorcycle.[img]http://a1276.g.akamai.net/7/1276/1354/fbb79bb0176cb9/www.buell.com/images/products/motorcycles[/img]
Here is a for sale ad for an Armstrong-Harley:
$7999.99
[url]http://www.richmondharley.com/usedbike.htm[/url]