AJS Starmaker?? Husky..w/ left side kick start.
Husky '70- 250 Cross or 360 Cross (by 8 cylinder fins) http://hem.passagen.se/to_ersson/HVA-250-1970-ERS-4.jpg
Fuel tank is for 175 model, I agree. Year is '73-75.
This is a 1975 YZ, not a 76. The 1976 model had the large air canisters on top of each fork tube.