There are two different muffler nuts
Early
Yamaha 256-14713-01-00 Nut, Muffler Joint is used in the following models and assemblies:
1970 XS1 - Exhaust
1971 XS1B - Exhaust
1972 XS2 - Exhaust
1973 TX650 - Exhaust
this is a bit smaller in diameter than the late
Yamaha 371-14713-00-00 NUT,MUFFLER JOINT is used on these models and components:
1973 TX500 EXHAUST
1974 TX500A EXHAUST
1975 XS500B EXHAUST
1976 XS500C EXHAUST
1976 XS650C EXHAUST XS650C
1977 XS500D EXHAUST
1977 XS650D EXHAUST XS650D - E - E006501- - F
1978 XS500E EXHAUST
Either one can be REALLY stuck on the muffler
I tried the "custom socket" on the rattle gun switching directions between on and off frequently, along with rust buster, heat gun, quenching, heat gun, repeat, and some pretty serious hammer blows around it using wood blocks to protect the chrome on that early nut, no joy yet..
If anyone has a better way to remove them please dish...
Early
Yamaha 256-14713-01-00 Nut, Muffler Joint is used in the following models and assemblies:
1970 XS1 - Exhaust
1971 XS1B - Exhaust
1972 XS2 - Exhaust
1973 TX650 - Exhaust
this is a bit smaller in diameter than the late
Yamaha 371-14713-00-00 NUT,MUFFLER JOINT is used on these models and components:
1973 TX500 EXHAUST
1974 TX500A EXHAUST
1975 XS500B EXHAUST
1976 XS500C EXHAUST
1976 XS650C EXHAUST XS650C
1977 XS500D EXHAUST
1977 XS650D EXHAUST XS650D - E - E006501- - F
1978 XS500E EXHAUST
Either one can be REALLY stuck on the muffler
I tried the "custom socket" on the rattle gun switching directions between on and off frequently, along with rust buster, heat gun, quenching, heat gun, repeat, and some pretty serious hammer blows around it using wood blocks to protect the chrome on that early nut, no joy yet..
If anyone has a better way to remove them please dish...