Sorry to break this to you, but your parts isn't the only thing your seller is ignorant (or worse) about. YM1300 goes back to the 1970s, and guessing (as I'm not in the office) I'd say 75-78 or 79. The gears in those front hubs are most likely available only as salvage, and I'd be surprised to find them considering how many requests we see for the same parts. If the place where you bought it can order the parts, any mechanic can fix it; however, I'd be right curious as to where they will order the parts (other than salvage), 'cause I don't know where to get those parts new. Posters here may have suggestions for you to check for salvage. Start with Fredricks 256-773-9951 then check Hoye 940-438-0386 Sounds like best bet may be to try to get your money back and buy another model more easily maintained.