Re: fan belt change on BJ8
Only BN4s and BN6s have the 3/8" belt (according to Moss, anyway). Changing belt size would require replacing all pulleys, and the 1/2" belt should be stronger and more durable anyway (possible why the 3/8" was superseded). IIRC, I've been able to R&R my BJ8's belt, but it requires twisting and pulling and potentially damaging the belt. Still, easier than pulling the crank pulley nut.