I think 797 needles will work. I believe I have a 740 or 797 with a MC100 kart motor installed. I'll send you a PM. Thanks!
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Same needles I have. MC100 is a very nice motor. Kinda rare actually as they were
only made one year before the 101 debut in 1967. I have one saw with a MC100 in
it and two with the MC75's in then. The 75's and 100's are the same motor @ 120cc's
just built in different years.