Re: amf sx 175
Probably too late now but after all this time all my missing two-stroke manuals have turned up - I'd wrapped them up to take to the Poker Run some time back when the Spaghetti Club were attending so they might have helped if anyone had a breakdown. I ended up not going then wife put package "somewhere safe" for me!
If it does help I have the workshop manual and parts book for the 175/250. For others looking in I also have 125 manual and parts book, parts book for 50/65cc models, parts book for Z-90, I think the X-90 as well (will check and correct later) and I also own repro 1948-55/1956-65 US two-stroke parts books and a 1959-66 US two-stroke manual but they were all lent to someone in 1992 and I am still waiting to get them back!