J,
Search the post " Fox Sundowner with Sachs, Saxonette engine"
I found this post under that title that has some good info and leads to parts and a manual.
Wild Goose
This manual has a lot of info. I bought it last year myself, and it's worth the money:
ARCTIC CAT MINI BIKE & OTHERS SACHS 50 REPAIR MANUAL | eBay
These guys also sell some parts, and an owners manual.
VINTAGE PARTS & HOFFCO/COMET Lauson power Certified Parts Corporation has Your Parts Cart for WetBikes, SurfJets, ATV's, PWC's, Mini-Bikes, Go-Karts, RV's, UTV's and Snowmobiles! OEM, aftermarket, and hard to find parts
Link to their owners manual: Item Details
Here's the guy (Bob Fragoman) who has all the parts and info, if you want them from the guy that bought the left-over stock when Fox went under. He also will send info on how to adjust things, including your carb.:
Bob
R. L. Fragoman
Box 157
Memphis, NY 13112
(315) 689-7047
mbman@juno.com
PS: send that serial and engine number info to Bob, and he can tell you exactly when your bike was manufactured.
PPS: When you look for parts on Ebay, also search using " arctic cat mini bike " as a search term. Several models used the same engine.