Aluminum after market swing arms for Penton's

[Big Mac]

Has anyone tried using/modifying the KTM aluminum swingarm from the '80-'81 (I believe?) KTMs to replace the chromemolly swingarm on the '76-'79 MC5s? The swingarm shock mount is quite a bit further forward and arm is about an inch longer.

I have a late KTM alloy swingarm and had tinkered with the idea of modifying it for the MC5. But if you loft it in one hand against the steel one in the other, they seem to weigh about the same. So if no weight advantage, then rigidity and longer wheelbase? Not sure it's worth the effort.

Mac

[bentrims]

I did some serious looking into roller bearing conversions for my 73-125 6 Days. Even went to a couple local bearing distributors.

After finding that the wheelbase on the EXCELLENT handling Penton was 4 inches longer than a 74 YZ 125 and a couple longer than an Elsinore, I concluded if it works dont fix it.

[bentrims]

The cahin even stays on those two sharp pointy things every moto.

[bentrims]

CHAIN[B)]

[thrownchain]

You mean you don't end up with a thrownchain???