They are all Two Strokes. You can also tell by the cylinder head on yours that there is no inlet and exhaust valve.
https://www.google.com/search?q=tomos+50cc
The answer by Cumberland the AI Answer Bot is reasonably correct.
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SOURCE: Jonway speedy 50cc moped....2 stroke or 4?
What year is it ? Is the cylinder-head height or shape capable of holding a rocker shaft and valve ?
SOURCE: ktm 50cc 2 stroke selfmixer can i jus mix oil gas
Yes. If you look around, you might be able to get a kit to eliminate the oil injection pump.
Testimonial: "cheers m8"
SOURCE: Engine loses power
Check to see if your silencer need a decoke .unburnt oil blocks up the silencer and reduces power output .
SOURCE: Where does my 2 stroke oil Go in my piaggio Zip 50cc 2007
There should be a tank, usually under the seat or behind the rear side panels. Just fill the 2-stroke tank and don't worry about the mixing, the engine does it on it's own.
More than likely, a 2 stroke engine is very picky about the fuel mixture. Try and find a new one. there is a DT owners club and most club trials riders will be able to tell you where to find one. Or try "Wemoto" on the web. they may have the bit you are looking for.
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