Is this nut normal
Thread or reverse??

Cheers
T1

I'm not aware of any reverse threads used on the 69-81 Yamaha Enduro engines. 

You are right ….
just needed a little heat…. Thanks

T1

Also for removal is quite simple with an air impact tool…like what you use to remove lug nuts and things. They spin right off without all the fuss. Re-assembly is always by hand using a torque wrench.

Busy day … I have an impact driver so should have considered that option … thank you …
what torque is factory spec???

cheers
T1

For the go-back…I’ve found torque specs by looking through various years of Yamaha service manuals. It has also been discussed here numerous times. I can tell you that I use 50 ft lbs on the primary gear, clutch hub and output shaft sprocket nut. For the flywheel that depends on what you are working on. The 68 DT1 has such few threads and regular nut whereas 70s bikes have more threads and nut is about 50% thicker to grab more threads. I’ve never had a problem with 45-50 ft lbs on those later bikes. No Way I’d try that on the 68. I won’t be getting into my 68 motor until this summer.

Good luck!

Oh yeah…my torque numbers are for great threads. If questionable threads don’t use my numbers.