1974 Harley Davidson AMF Aermacchi X90 Minibike

[yamahadirtrider24]

how fast are these little buggers.



[jdaugustin]

@yamahadirtrider24

This one does about 60.

[Deano7163]

I owned one of those brand new in 1974. I sold it in 1977 to buy a dirt bike. I recently found all of the original paper work from when I bought it from a Harley dealer in Milwaukee. I am now searching to find this original one I had. Do you have the vin number on this one and are you the original owner?

[JerryMopar]

twisting the throttle before startup wont do anything, since the carb does not have an accelerator pump on it. Hope this helps, have fun!

[jdaugustin]

you are right on both counts, I do it to make sure the throttle is all the way closed. If the flat slide is open even a fraction the engine rpm races instantly on startup. I don't like racing the engine right away, parts are just too hard to find if it blows......:)

[motorman2816]

i want that for trailin!!!! ill buy it!?!?!

[marcusrusek]

beautiful  bike -- thanks for posting the video

[floobeytubey]

1.5 horse power you say? That can't be right. I'd expect more like 7 horsepower from a 90cc two stroke.

[jdaugustin]

The book says 1.5 taxable horsepower. So that's the calculated horspower based on bore, stroke, and presumtion of efficiency. It was just a number used in Europe back in the day. You're right though, it probably acutally puts out 5-6 HP, which is about what a Honda CT70 put out. I can tell you from experience this thing will waste a modern 50cc scooter in acceleration and top speed.

[cleanserene]

I used to have one of these around 1981 or '82. Parts were obsolete for it even at that time. I bet it is a real bitch to find parts now.

[jdaugustin]

You ain't a kiddin. Not only hard to find, but expensive when you do.

[JerryMopar]

have you tried moto italia and charleston cycle? generally the price arnt bad considering. My father and I 2 SS250s and 1 MX/SS Hybrid. He used to have a Z90 also.

[doughemi57]

I used to have one of those when I was a kid.

[Hiphopopotamus8]

I have a 74 just like yours. Where can i find a throttle for it?

[jdaugustin]

Yes, send me your email and I'll send it to you. They vary by year, so make sure you have the right year. The 73's had a different looking speedo than mine (74) and 75 is the same as 74.

[rockasaurus13]

do you have a wiring diagram for that?