Yes acetylene torch tip files are cheap and come usually with a tip cleaner/ hole diameter chart stamped in the lid... :wink:
Also for interests sake you could google a conversion chart for machinists that cross reference hole size mm/inch fractions/thousands and letter size drill bits.
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'91 Yamaha Warrior- stage 2
'83 Honda ATC 70
'08 Yongjiang 125cc mx (Loncin)
'08 Yongjiang 150cc atv (Jinlong)
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