SC 52 FS. Service And Test Runs.

The SC 52 FS. This is a used engine that was left in storage for a long time. It was stuck and needed a good service, clean and bearing change.
I don't show it on the video but I had to spend a lot of time lapping to get the valves to seal well enough to get the engine to run properly.
A perfect seal would be the best but you don't need a hundred percent seal and you can get away with a bit of leakage. The faster the rotation of the engine the less time there is for leakage and therefore the engine will run fine.
It is difficult to start by hand but it starts right up with a starter.
After some research on the rc groups, I learned that it is a common problem with these engines. Some people believe that it is the bronze valve seats that are cast Into the aluminum that leaks on the sides through the head that causes the problem no matter how well the valves are seated and it differs from engine to engine.
After testing, this engine runs very well. The test runs were done with 10% nitro and it starts right up with the starter, idles reliably, and overall runs very well.
This engine with a 12 x 6 prop would be perfect for a Cub.
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[@pietmalan2858]

Awesome video! Engine runs like clock work! Well done, thanks Rinze!

[@avionette]

Hello.......have you done an ultrasonic cleaning

[@rcaeroenginerepair]

Hi. Yes. I use an ultrasonic cleaner and then some old-fashioned elbow grease. 😁

[@homienat3374]

Nice vid mate enjoyed it .i have 1 myself needs a tear down ,but what's ya thoughts on engine ,thanks 🤙🤙

[@rcaeroenginerepair]

Hi. Thanks. I have found some of these to be pretty good but some have leaking valve problems. You will spend hours lapping valves without success. I have read in some RC Forums that some people believe they could be leaking past the valve seat that is not cast in properly. I believe this to be true in my experience. They look the same as an OS but I think the main difference that makes it run differently also is the carb. I also believe that they are the same as ASP and some other makes and the parts are interchangeable.

[@homienat3374]

Hi again mate ,i gove my 1 a tear down all looked clean ,but just cant get it to run over 3/4 throttle, or idle keeps cutting ok ,now ive only put a small tank test maybe still to much 3 in 1 oil in her ,i did not pull carb appart , piston is like new ,but it just doesn't seem to have much compression, it was like that when i got it ,even after rebuild still the same ,could it be valve las?? ,it runs after good prime and after 2 mins shuts down any help would be appreciated mate ,thanks , i just got a saito 180a so will be using you vids again thsnks 😂🤙🤙

[@harveynewman4333]

i built a l of chineese ,4 stroles. i have never seen as much poor machine work as these this have. i have had to lap the hell out of some them,so as not to leak past the exhaust valve. some of them i had to replace the head.

[@rcaeroenginerepair]

Yes it's not a OS or a Saito but with some patients you can get them running pretty good 👍.

[@harveynewman4333]

@@rcaeroenginerepair o yea,very much so. i have a bunch of asp, and magnums, and all run great,idle very well.