Does anyone use a torque wrench on their Commando primary chaincase cover single bolt ?

No just do it up and a light nip up is all that is needed, never over tighten it, but of course always make sure the O rubber seal is good, reasons the primary covers leaks is over tightening of the centre bolt, I found out a very long time ago not to over tighten it, mine never leaks and I only use a O rubber seal.
 
concours said:
If your INNER primary case is properly shimmed BEHIND it, it all snugs up nicely.
You will FEEL IT bottom out.

If not, it can bend both of the cases.
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You can do worse than that. Ask me how I know.
 
I just tighten it but have a custom vernier stud to set the inner and a positive stop as far as the inner to outer cover, so it sets the O-ring cord crush when locked up.
 
concours said:
Do tell Dan...
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During the 2022 season, after doing a layshaft bearing replacement, I had a slight primary leak around the engine sprocket. Near the end of the season I was not able to reduce speed sufficiently to avoid a culvert repair in the road. I hit it pretty hard. After that I had a significant leak around the engine's sprocket. After rebuilding the engine the following winter I found that the area where the 3 bolts secure the inner primary to the crankcase was cracked. I had not put sufficient spacers behind the stud where the inner primary rests behind the outer primary nut. The inner primary had a strain on it all summer but didn't give up the ghost until I hit that road repair hard. I ended up replacing the inner primary and paying particular attention to getting the studs spaced out correctly. Although I haven't gotten to ride it much due to some teething problems, it doesn't leak a drop out of the primary case.
 
And that's how we learn.
There's actually quite a bit of movement and fettling with that inner primary.
Something that appears so simple, yet can have issues.
 
MichaelB said:
And that's how we learn.
There's actually quite a bit of movement and fettling with that inner primary.
Something that appears so simple, yet can have issues.
Click to expand...
I spent a lot of time test fitting the inner primary with the gasket in place. It fits perfectly flush with the crankcase when pushed against the center mounting stud.
 
I recently was helping my friend install a new CNW Estart and in the kit was an adjustable inner primary mounting stud.What a nice touch as it eliminates the shims to get inner stud to the ideal position. I was impressed
Mike
 
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