Piper Cub?

That's beyond cheap for ANY aero engine. 

Only extremely cheap if it has a logbook. If it doesn't have a logbook it's only good as an airboat motor. Would cost the price of a new engine to get a logbook for it.

If it's going in an aircraft that has been de-rated to "experimental" or a homebuilt, it doesn't need to be certified.

No script on the valve covers tells me that it's probably a copy made with questionable metallurgy in a factory with a dirt floor.

But hey, it's less than a grand! I'm sure nothing will go wrong and if it does, you can just pull over, right?

Edit:

Looked at the picture again, it appears to only have a single ignition system so probably for an airboat. The colours make it look like it came in a Happy Meal box.

It's your life man...

Would a Cub be Part 23 or Experimental or "it depends"?

In reply to pres589 (djronnebaum) :

I don't know how it would work in the USA, I've been out of aviation in Canada for about 20 years now.

I remember that (up here anyway) you could apply to have small aircraft under a certain weight limit de-certified and classed as a homebuilt. I believe the Cub was one of the aircraft that would fit within the regulations.

In reply to wlkelley3 :

*cough* Homebuilt *cough*

In reply to ShawnG :

read  the text it's a Military? and these engines can be bought , this one is all NEW Parts. or ask the Seller

In reply to ShawnG :

Derating an airplane is hard to do in the US. There's a couple of work-arounds, but it's very costly and time consuming even with some serious effort.

The primary problem is that you need to get the local FSDO to agree to do it, which is a coin flip, because most of them will want to see the reason why you're trying to derate to another category. When they do it, it's usually a one off exception that has to do with air racing, exhibition only, or research and development (you're developing a PMA) where an STC wouldn't be appropriate. All of those type certifications carry specific restrictions however.

CFR Title 14 Part 21 Subpart H 21.191 through 193. Are the relevant sections of US code.

It's way easier to get, or buy the engineering work for, an STC in the US then to derate.

JoeyM said:

Petrolburner said:

I got my floatplane rating in a J3 Cub in Florida. 

Was that by chance in Polk County at Brown's Seaplane Base?

It sure was.  Good times.