I think an 025/250 carb fits with minimal hassle and makes itnfully adjustable and adds some zing.never werked on a 170 b4
wont take throttle
will run up n cut if ya feed it slow
carb n af clean, new ff, muff was clean
no idle or hi adjust on it
lifted the lever a bit
askin for a friend not wantin to put much $$$ in it