Possible project/conversion: Stihl FS50E
#1
Thread Starter
Possible project/conversion: Stihl FS50E
I got this engine from a rental yard some years ago. It was originally a String trimmer of some kind, though it couldnt have been a very powerful one. It does still run as-is, but I'm considering converting it to run as a glow. I cant find any info on it through stihl or googling the model number. I measures approximately 16cc or .98 cubic inches. (1.100" bore, 1.027" stroke) so I dont think it would be overkill to run as a glow. Anyone have any insight on this little guy?
edit:
The carb that came on this engine is a Teikei from Japan, the numbers stamped on it are NB and 3L. It also has a primer of sorts. Engine (butterfly) side of the carb is 13.85mm, outer diameter of the carb is 6.47mm approximately. This carb has two mixture needles.
I have a Walbro carb thats bigger, but I dont know if either carb will flow enough fuel to run methanol. The Walbro is a WT 26 and doesnt have twin mixture needles. Engine side is 14.28mm, air cleaner side is 7.9mm.
edit:
The carb that came on this engine is a Teikei from Japan, the numbers stamped on it are NB and 3L. It also has a primer of sorts. Engine (butterfly) side of the carb is 13.85mm, outer diameter of the carb is 6.47mm approximately. This carb has two mixture needles.
I have a Walbro carb thats bigger, but I dont know if either carb will flow enough fuel to run methanol. The Walbro is a WT 26 and doesnt have twin mixture needles. Engine side is 14.28mm, air cleaner side is 7.9mm.
#2
My Feedback: (6)
RE: Possible project/conversion: Stihl FS50E
You will find that the power will be low for the weight of that engine. However, it might be good on a floater like a Cub or a Telemaster.
The Walbro WT-499 is made for use with methanol, but at 11 mm venturi it is a touch big for a 16cc engine. You might try a carb from a Ryobi trimmer. They are small, but probably larger than what you have, and they are usually Walbros. If necessary, (and it might be), you can enlarge the passages to double the area in the carb. (Double the area, not the diameter.)
Another option would be to go Gas/Glow, in which case most carbs will flow enough. Look up the "Gas/Glow How To" thread, and read the first two posts for info on that.
Good luck,
AV8TOR
The Walbro WT-499 is made for use with methanol, but at 11 mm venturi it is a touch big for a 16cc engine. You might try a carb from a Ryobi trimmer. They are small, but probably larger than what you have, and they are usually Walbros. If necessary, (and it might be), you can enlarge the passages to double the area in the carb. (Double the area, not the diameter.)
Another option would be to go Gas/Glow, in which case most carbs will flow enough. Look up the "Gas/Glow How To" thread, and read the first two posts for info on that.
Good luck,
AV8TOR
#3
Thread Starter
RE: Possible project/conversion: Stihl FS50E
ORIGINAL: av8tor1977
You will find that the power will be low for the weight of that engine. However, it might be good on a floater like a Cub or a Telemaster.
The Walbro WT-499 is made for use with methanol, but at 11 mm venturi it is a touch big for a 16cc engine. You might try a carb from a Ryobi trimmer. They are small, but probably larger than what you have, and they are usually Walbros. If necessary, (and it might be), you can enlarge the passages to double the area in the carb. (Double the area, not the diameter.)
Another option would be to go Gas/Glow, in which case most carbs will flow enough. Look up the ''Gas/Glow How To'' thread, and read the first two posts for info on that.
Good luck,
AV8TOR
You will find that the power will be low for the weight of that engine. However, it might be good on a floater like a Cub or a Telemaster.
The Walbro WT-499 is made for use with methanol, but at 11 mm venturi it is a touch big for a 16cc engine. You might try a carb from a Ryobi trimmer. They are small, but probably larger than what you have, and they are usually Walbros. If necessary, (and it might be), you can enlarge the passages to double the area in the carb. (Double the area, not the diameter.)
Another option would be to go Gas/Glow, in which case most carbs will flow enough. Look up the ''Gas/Glow How To'' thread, and read the first two posts for info on that.
Good luck,
AV8TOR
The walbro WT26 I have came off a 30cc or so string trimmer. The venturi on that is about 1.4mm larger than the Teikei that came on the engine. I'll have to tear it apart and see it can be made to work with methanol. Otherwise I have one more Walbro carb that has two mixture needles on it that is off of something 30cc or larger. I'll have to find it and get the number off of it. Worst case scenario, I have a 30cc homelite that has twin mixture needles I could pirate to try..
I'll go re-read the gas/glow section. I read through the whole thread sometime last summer but I'll refresh my memory some.
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RE: Possible project/conversion: Stihl FS50E
Do you have the airboat already or are you building one for the engine?
Looking for a good size boat myself for a 20cc engine I just converted.
John
Looking for a good size boat myself for a 20cc engine I just converted.
John
#6
Thread Starter
RE: Possible project/conversion: Stihl FS50E
ORIGINAL: av8tor1977
I wouldn't waste any time on the single needle carb. You definitely need twin adjustment needles for anything that you do with the engine.
Good luck and have fun,
AV8TOR
I wouldn't waste any time on the single needle carb. You definitely need twin adjustment needles for anything that you do with the engine.
Good luck and have fun,
AV8TOR
The engine has twin ball bearings on the crank I found, but I havent checked to see if the conrod has needle bearings or not. I'm assuming it does though.
It won't be easy, but for the heck of it I'll check the port timing on the thing once I get it torn down. Any idea how much the glow plug adapter would cost?
#7
Thread Starter
RE: Possible project/conversion: Stihl FS50E
ORIGINAL: gr8flyer55
Do you have the airboat already or are you building one for the engine?
Looking for a good size boat myself for a 20cc engine I just converted.
John
Do you have the airboat already or are you building one for the engine?
Looking for a good size boat myself for a 20cc engine I just converted.
John
If the engine runs good on glow and turns smaller lumber well, I'll build a hull for it. If I built one for this size engine, I'd probably go 36" long and 18-19" wide and maybe 2.5-3" tall. The airboat my SuperTigre is on is 32" x 18" which is a flatbottom balsa/birch construction.
#9
Thread Starter
RE: Possible project/conversion: Stihl FS50E
ORIGINAL: Scota4570
For a hull get a ''Boogie Board'' from wall mart. There are u-tube videos on this. I have been meaning to make one.
For a hull get a ''Boogie Board'' from wall mart. There are u-tube videos on this. I have been meaning to make one.
This engine might get converted after all. I think I might build a rescue vessel to recover stalled/flipped boats. Since it would need just enough power to move itself and a little left over to push a dead hull..... I think it might suffice. I need to get the glow plug adapter and I'll just put a new ring in it for the heck of it.