Darryl, i certainly agree 1/2" tubing is way overkill for the clutch line. It's a mystery why the OEM spec'd it. I suspect a massive typo.
I don't know what version of the parts manual you have, but mine shows that the original spec was lengths of 1/2" flexible hydraulic line! That's even weirder.
As someone mentioned above (maybe you), using 1/2" tubing just makes bleeding much more difficult as you won't get enough fluid velocity to carry air bubbles along the tubing.
So that's a 1/2" UNF thread on the m/c outlet. That's why I couldn't get the as-found 1/4" NPT fitting to seal!
Malcolm
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