OS 50 questions
 

Hello again,

Well after getting my 46 apart thanks to help from forum members here I thought I might take apart an old OS 50 I picked up second hand. I figured the bearings might be the same size so if they both need them I may as well buy them at the same time.

I have the motor mostly torn down, but the main bearing remained in the case this time so I am going to heat it and bang it on a piece of wood to try to dislodge it. Can anyone tell me if this motor was any good in its day, it has a ring that is right at the top of the piston and the carb has 5b on it. The front bearing looks and feels shiny new but rear bearing has rust on the cage and feels just a tiny bit rough, the rest of the motor looks to be in very good shape other than part of the fins on the front of the head being ground off from nosing over on an asphalt runway.


thanks,
Calvi

It would help to add the model identifier. It's usually cast into the crankcase on the outside. OS has made hundreds of different models, with some displacements categories having a dozen or more models. Example 50SX, 46SF etc

Hi 1QwkSport, it is an OS MAX.

They're all OS Max. There's usually a two-letter model identifier like what I used as examples in my last post. If there are no identifiers, post some pictures of the crankcase?

Here are some pics of the motor case, hope this will help.

http://www.rcuniverse.com/forum/atta...mentid=2129015http://www.rcuniverse.com/forum/atta...mentid=2129016

Looks like an old FSR. The FSR is said to be the best or one of the best series' of engines OS ever did. They are highly coveted.

Good to know 1QwkSport, thanks. I will definately put new bearnings in it, maybe a new ring too.

Ok one more question, should I source the bearings out at the local hobby shop, local bearing jobber, or online? I found a place called RcBearings.com, has anyone dealt with them or can anyone recommend an online supplier?

Thanks

I use RCBearings.com almost exclusively. Good company to work with and great prices. Boca Bearings is another supplier, but their prices are quite exuberant on a lot of sets.

Thanks again 1QwkSport

Sure thing. Good luck!

Thanks, I already ordered from RCBearings, I still have a RJL 61 and a couple 46 FX's to do so I may give them a try.

Calvi

I use RCBearings exclusively. Never had a problem and I figure if it ain't broke, I ain't gonna fix it.

It's OK, I've been a Boca guy for 24 years, it's been all good.

Sounds like a Dykes ring? I didn't know OS ever used such a ring. Never to late to learn something/

Sincerely, Richard

Hi Dave. Still trying to get those Farmall pics to you. I can't seem to get them off of the phone onto the PC. PM me your email address, if you choose to, and i will send them that way.

Very best regards.

Sinceerely, Richard

Hi Richard, I will post a pic of the piston later, gotta bring it in from the cold first.

...

All my FSR engines are wonderful, powerful, reliable works of art

Here a few shots of the piston/ring.


http://www.rcuniverse.com/forum/atta...mentid=2130258http://www.rcuniverse.com/forum/atta...mentid=2130259http://www.rcuniverse.com/forum/atta...mentid=2130260

That's a Dykes ring if ever there was one.

Looks like it needs replacing

Where do you think I could find one Fiery? I came across someone who sells rings while reading a thread here but forgot to write it down, will have to do a search.

calvi

Cal, the only Dykes type ring I can find for an OS FRS is for a .45, all the .50 rings I can find are conventional. This one is on E-Bay just search OS 45 Dykes ring.