I got into the hobby when a late friend used to fly his kit plane “Cowboy” It’s an engine im fond of as it brings back great memories of great times together enjoying the hobby with my late friend. These engines are not Schneurle ported and I believe have a cast iron/steel piston that takes a very long time to break in. I ram 25% castor 75% methanol when running in a recent engine and it took 10 tanks to get it reliable enough to be airworthy. Basically you have to let it 4 stroke then run through a tank then close the needle two clicks between each tank otherwise it will overheat and cut. Patience is needed with these engines.
Correct - cross flow engine and steel liner / iron cast piston .. because of the excellent engineering on OS engines, they did not require more than 30 mins of break in .. but yea .. several short and very rich runs for the first 20 mins and then gradually lean them a few seconds at a time and then back off to rich .. repeat this until the engine can hold a full minute at full speed without showing signs of overheating .. we took our time back then and it was a very enjoyable process. In return, we got an engine that lasted almost forever ..
Maybe an extra 2% castor oil will help during this breaking phase. Back in the days ( mid 70's ) I run this exact engine with 75/25 fuel ( all castor oil ) .. this is a great little engine that will last forever
I've had engines just randomly quit like that, but never considered attributing the problem to be too much heat, hmm. Interesting indeed. Two of my engines act like this. One is an old beater Magnum four stroke, and the other is an older OS. They just wouldn't run right no matter what I tried.
![YoungBoy Never Broke Again - Catch Me [Official Video]](http://i.ytimg.com/vi/KxwEXXFQMTY/mqdefault.jpg)
I got into the hobby when a late friend used to fly his kit plane “Cowboy” It’s an engine im fond of as it brings back great memories of great times together enjoying the hobby with my late friend.
These engines are not Schneurle ported and I believe have a cast iron/steel piston that takes a very long time to break in.
I ram 25% castor 75% methanol when running in a recent engine and it took 10 tanks to get it reliable enough to be airworthy.
Basically you have to let it 4 stroke then run through a tank then close the needle two clicks between each tank otherwise it will overheat and cut. Patience is needed with these engines.
Correct - cross flow engine and steel liner / iron cast piston .. because of the excellent engineering on OS engines, they did not require more than 30 mins of break in .. but yea .. several short and very rich runs for the first 20 mins and then gradually lean them a few seconds at a time and then back off to rich .. repeat this until the engine can hold a full minute at full speed without showing signs of overheating .. we took our time back then and it was a very enjoyable process. In return, we got an engine that lasted almost forever ..
Quite a difference from first run. interesting.. Thanks for the video David!
I have been hell bent on trying not to use nitromathane lately, but a little bit does sometimes help.
Thank you David again very tight little engine, touch a carburetor❤ 🦅
Maybe an extra 2% castor oil will help during this breaking phase. Back in the days ( mid 70's ) I run this exact engine with 75/25 fuel ( all castor oil ) .. this is a great little engine that will last forever
The muffler nut was backing off for a while, finally spinning off at 4:52 into the video.
Damn. Good eye!
That with earphones 🎧 Is 😮❗
Perhaps the engine will run better with an OS #6 (A3) glow plug.
Yes I could be running that plug with FAI fuel.
I've had engines just randomly quit like that, but never considered attributing the problem to be too much heat, hmm. Interesting indeed. Two of my engines act like this. One is an old beater Magnum four stroke, and the other is an older OS. They just wouldn't run right no matter what I tried.
Sorry, touchy carburetor