Starting and Running a Vintage OS MAX H 40 P. Model Airplane Engine 

I just bought another OS Max 40P off eBay, this time for £10 and it is like new in it's box. What fantastic engines these are and no one seems to know it! Thanks to you I spotted these superb OS engines after watching your video. Many thanks!

You did well with your purchase. WOW! That's a great price.

Beautiful sounds

Great engine, just bought a very good example on eBay for £15, superb! Looks good in your video. Best regards, Paul.

Thanks again! It should be an awesome runner then because, it runs so well with the leak. Amazingly well for a 43 year old engine that didn't get well treated by its owner (me).

The bubbles are a tell tale indication. I think you will surprised at how well it runs when its fixed.

OS Max H 40 P:- This is an early 2 stroke engine produced in Japan in early mid 60's. The 40 P series engines were popular at that time for Goodyear Pylon Racing which was just being introduced at that time. Specifications:- Type 2 Stroke Nitro Glow Ignition Displacement Capacity 6.5 cc (0.397 ci.) Bore 20.6 mm (.811 in.) Stroke 19.5 mm (.786 in.) Practical RPM Range 2,500 to 14,000 Weight .275 grams (9.7 oz.) Design Features:- Aluminium Piston Steel Cylinder Liner Cross Flow Scavenged

Used 10% nitro Glow Fuel.(10% Nitro-methane, 70% Methanol and 20% Castor oil)

Hi I've got an old O.S. 40 and I was wandering what fuel you are using

Thanks for that! I can see it too now at the very end of the run. Right?

Geez, Nice example of letting and engine run lean til it damn near dies.

I think the head gasket is leaking

i found an old 40 like this in the woods from a crashed plane. could you look at my video and tell me about it?

Check out my .20 RC video, brand new just barely broke in , it is on the front of my Mustang.