I was given a Royal .25 BB R/C engine by a friend of a friend who heard that I mess around with planes. It was in his late father in laws basement workshop and somehow didn't end up in the estate sale. I popped the head and back plate soaked it with penetrating oil for a while and hit it with the heat gun and it freed right up. It appears to have been run on a stand and has a very slight pinch at tdc but the bearings must have some corrosion on them because they feel a little rough. Is this engine related to the Thunder Tiger & Magnum pro 25's ? A guy had one on a Super Clown a few years back at our New Years day fun fly and it seemed pretty strong from what I remember about it.  Would this be a good engine for the Galaxy kit that is collecting dust in my shop ? Thanks T J

Well I think I found my Galaxy engine. After work I swung by my Mom's place to play with my new engine. After 2 days of marinating in PB Blaster the bearings were a little looser and I decided to run it like MM suggested. I blew out the high speed needle passages on the carb, and shook out as much penetrating oil as I could mounted it on my test stand put an Evo .36 tube muffler on it and tried it. It took a few primes to burn the remaining penetrating oil out but it finally cleared out and started running on its own , the idle mixture screw was moving all over on its own and kept going in and covering the spigot finally it died . I hooked up muffler pressure and it ran much better and I finally set the mixture nice and rich and ran the tank out. The bearings did indeed get a lot smoother after burning  2 oz of fuel . Time to turn a venturi for it get a couple different props and some more glow plugs for it and run it a little bit more but all in all very promising. I have only got enough fuel left to run four more engines that are awaiting their turns and then I gotta get some more. T J

INDEED ,

stored aftr running on nitro , uniled unflushed , bearings often rot .
 ( all three s/h ST 60s  are shot . To varying Degrees. one has BOTH Shielded , so obviously replacements , its unflushed nitro / moisture )

Just rust spot from crank web scoured out a good FP 40 I have .

I think any s/h engine should at minimum have the backplate removed to inspect . USE A FLASHLIGHT .
If Grubby a full strip down & clean . Just scored 4 cans of brake clean for ten bucks , beats $ 8 a can , even if it wasnt 10 for 4 . 

Seems to loosen carbon up inside pistons etc .Often a vehical stored decades is fine . IF STRIPPED AND CLEANED .
the consequences of not doing so are EXPENSIVE .

Ran a 10 x 6 Tornado on the Magnum 25 pro, fine once it wore to 9 1/2 , doing the 4-2 bit, or at least a strong ' pick up ' turned or high .

Well I tore the engine down for a thorough cleaning and inside it was pretty clean, Ive been a mechanic for a living for 32 years now and know better than to run an engine like this but in the excitement of it all I did it anyway, my bad but fortunately no harm done. There was some dried gook in front of the rear bearing but other than that it was pretty clean. The bearings cleaned up nice the front one still feels like new the rear one has a very slight rough feel to it so I'm changing them both out, the bearing house that I deal with at work has them in stock, for a few bucks it's worth it just for peace of mind. Now to make a venturi for it. T J

Peace of Mind then .
This had a touch lean run on its first flight ( run ) in a Goldberg Shoestring on a 36 C day , turn of the centurie . 10 gallons through it . still runs o.k. ,



I threw a Fox 19/25 BB Schnurle intake in it , 7.5 mm bore .
Its an old loose fit Taipan N V A , with two line gromets Ea Side of round intake , to seal there .

The last thing the Needle Does is SEAL . Fingertip on it ( Nice Ratchet ) to Adjust a click or three , rocks the needle . Finger off its back to burble .
So Sealing with tube under it was useless . IT DOESNT WANT TO BE SEALED . In This Case . Mufflers a K&B 3.5 SRII can , one hole plugged .
http://stunthanger.com/smf/index.php?action=dlattach;topic=43810.0;attach=255826;image
SIDE MOUNT built up fuse , the fuel head is inside the needle , laterally , so low is rich , setting is Not To Dry , in Oveheads .
The Thrown Together set up works so well ( after trimming the pprop , touch & go , trike gear , on concrette , up the Resivoir . In WIND ,

That after that it was at home in the Wind , even if the Pilot wasnt always . Requires some footwork over 18 knpots , and a hard ( black )
Tornado 9 x 6 or 9 x 4 , dealing with plus 20 , considerably . on occasion .in the Noble sized Phantom . Repaired one or two times , with a zero added .

So Now We Know . A quick wipe down with a rag and petrol , took 45 minutes to get all the gook & grass off , in the summer mowing season .

So , itll go forever on Good fuell . 

Well they had my bearings in stock at the bearing supply that I deal with and they wouldn't even take any money from me, thanks Dennis ! I put it together and figured out I had about 2 oz. of fuel to spare so I mounted it up and ran it again. I really like this engine it's got a lot of pull yet it's very smooth. I have a 10 x 4 on order for it I have been running it with a 9 x 4 . I noticed that the spring that is supposed to keep the idle needle from moving was missing fortunately I had a socket head cap screw  the same size, It follows the needle nicely now. I have a Magnum Gp .25 and it runs similar but the Royal seems to have a softer break. I think this engine will work out perfectly on my CLC Galaxy. I am glad this engine found it's way to me . T J