Originally Posted by
hueyhoolihan
i use oldschool standard 1inch quill road stems, SR, 3T, cinelli grammo,
with my oldschool 26.4 (?) clamp diameter MTB bars, like KONA and just about any made before the 31.8 clamp diameter became popular. no problem. of course, any shifters, grips, brake-clamps are not interchangeable between road bars and mtb bars, but you didn't ask, so forget i said anything.
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It's hard to know what the OP's handlebar diamater is.
The typical quill stem in the day was designed for 26.0mm handle bars.
26.4 was the Cinelli specific standard
Mountain Bikes were 25.4
However, many Japanese made road handlebars used 25.4.
Given that the OP's bike is basically a low price Japanese wanna be road bike, it's hard to tell what size the handlebars are without putting a caliper to it.