Dear Dawg;
Well; that's a start.
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Ya see; with 4 main bearings the crank
does a little 'dance' at 5500 RPM and
that puts it into "self destruct", at
about 5800-5900. That's the MAX.
The later ones have seven and will do
9,000 RPM with a few modifications.
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Build the early model and just run it
in the 'normal' RPM range (up to 4500)
and enjoy... A few @ 5500 is okay but;
if you miss a shift, It's all over.
So; be carfull, have fun and be happy.
Ol' Smokey called that dance the "Hully Gully"