Help ID This Engine, Please!

[Doc Sprocket]

Help ID This Engine- RUNNING!!

Hey, all- Found this scooter/goped in the ditch by my place. It's missing the coil, and I haven't had any luck identifying the engine. Looks like 2-stroke weedie, probably 25-40cc, but I need to nail it down if I want to find the right coil. Any of you gas gurus out there know what it is?
BTW- Scooter make is "Royce Union", and I can't find s**t on the 'net. Thanks, Chris

 

[mike75925]

the backplate looks like a ryobi weedeater i was fixing on.

 

[vgk]

looks like it was custom made with a bike. royce union was a bike manufaturer in the 90s maby early 2000. they were walmart bikes. i use to have one.

 

[KieranM]

i do not think its a weddie engine the output shaft is larger and there is no section in it to connect to a weddie shaft. My best thought would be that it is not a homemade scooter but it looks kike it was mas produced as an engine for a goped/scooter. I dont think you should keep that engine though it looks shot.

 

[Doc Sprocket]

Keep lookin' folks, and thanks for the input so far. I'm pretty reasonably sure the engine will turn out to be a fairly known name, or a clone of one. I don't think a bike manufacturer would R&D and build thier own engine, doesn't seem like an economically sound chioce to make. You'd have to sell an insame amount of units at a pretty penny to recoup that. I was hoping to save the engine, give it to the kids to beat on. I'l probably tear into it later to inspect the carb, piston, sleeve, case etc. No sense nailing down a coil if the engine's pooched. I have a spare, running Homelite weedie motor kicking around, maybe I'll get lucky and that output shaft will fit? Who knows. But this would be a better score if all I needed was the coil! Keep looking, folks, and thanks!

 

[Kenny_McCormic]

Custom output shaft.

 

[Doc Sprocket]

UPDATE- Found casting# 21870 on flywheel...
Casting #04725-B on cylinder
Here's a presh pic. Does that "RV"-ish logo in the lower right mean anything to anyone?
Also- I measured bore and stroke as accurately as I could- 33mm bore, 30mm stroke. Now, Is it bore x PI x stroke? If it is, I get 31cc. But it's been a long time! Please correct me if I'm wrong!

 

[Kenny_McCormic]

Around 25-26 cc. You are basically finding the volume of a cylinder. Displacement=bore area*stroke so (pi*R^2)*stroke. (pi*16.5^2)*30= 25659 mm^3 divide by 1000 to get CCs(cm^3).

 

[Doc Sprocket]

Okay- Thanks to the indian rope trick and a pipe wrench, that output shaft came off, and so did the flywheel. The block has a casting number under the flywheel, #04381-A. There was also a 25 which might be the displacement (right, Kenny?). The crank is tapered with a keyway, and threaded, maybe 1/4-28. Overall, this engine appears to be in very good physical condition, I really want to know what it is so I can find a coil!
Also, the flywheel is marked Phelan. The crank is supported on 2 ball bearings, and the rod has needle bearings at both ends- seems quality to me...

 

[Doc Sprocket]

UPDATE! ENGINE RUNNING!!! WOOOHOOO!
I still have no idea what it is, but I saw a youtube video of someone running a homelite 25cc on the bench, for use with an R/C airplane. The castings looked very similar. So- I dug out an old Homelite weedeater I had buried in the back, and tore it down. There were a few minor-looking differences, but sure as shoot, the coil fit! And made spark! So while I was at it, I swapped carbs, as the original was quite nasty looking and the plastic choke lever was broken off, clamped it to the railing on my back porch, and had at it. The carb needs some tweaking, but it does run!
Incidentally, I have no clue what the spec is for the gap between the coil laminations and the flywheel magnets, but I remember reading on this forum somewhere about using a business card. Thanks to whoever it was that said that!
http://www.youtube.com/watch?v=wuqqRfLsBvM

 

[freakboy]

good job there!

 

[mike75925]

atta boy! did the scooter catch fire? or is all that grease/oil and road grime?

 

[Doc Sprocket]

It's just assorted smegma. I still havent ID'd the engine, but the main castings look very similar to the Homelite 25cc trimmer that I pillaged the coil and carb from. Cating marks and numbers are different although displacement is the same. All bolt patterns align. Maybe one's just newer than the other.
The scooter needs a serious cleaning, a tire repair, a new throttle, and some misc. bits. Too bad we're blanketed with snow...
At any rate, I proved the engine's still good. I think I'll clean up the old Homie and select all the best bits to make the best engine of it all...