Progress.....And more new parts

My new Comstock/CNW MK3 rear hub and 520 chain conversion showed up today Nice stuff !
Delivered it to my friend Leo Goff and he told me the engine is almost finished . Bike is on
the lift at his shop at home . Said he hoped to have it ready in time for the Barber Vintage fest

What is this conversion? Why a 520 chain? Is it stronger?

Vintage Paul

Another nice upgrade but regarded by some as un-needed. Requires a 1/4" sprocket and turning the brake hub down to 1/4". In order to have an Oring drive chain, you need to go down to 520 chain. A 530 oring chain is too wide to work. It's nice not have to lube the chain so often. Works well, nice, but again, not really needed.

Some say the rear sprocket, which is also the brake hub, is vulnerable to wear witout machining. Making it thinner makes it even weaker. I like mine though. "Gold chain is perdy"

I just figure on replacing the standard chain around a couple thou miles. OB has them for about $35 delivered. Don't even need to oil them for that price, just change them every year. My rear drum is a bit worn after only 13K miles, the sprocket looks good.

Dave
69S

While all of my bikes are riders , I keep them detailed as if they were show bikes .
So I like the idea of an 0-ring chain since it will enable me to spend a little less
time cleaning gunk off of the back of the bike . Since the bike is mostly apart now it was
the perfect time to do this . There's a thread on here re Jim Comstock's belt drive and
in it he posted a pic of some MK3 rear hubs he was machining for CNW . When I saw that
pic I had to have one . Aside from the machine work , the real beauty of this
setup is that it allows you to use generic sunstar rear sprockets . The sprocket
simply bolts to the hub/carrier assembly similar to the setup my Ducati Supersport
uses. Now I can effect gearing changes without having to remove the primary . I
can also fine tune the ratio more precisely since rear sprockets are available in
one tooth increments several sizes up or down from the stock 42.

The thought of paying a couple hundred bucks for that stock Norton boat anchor rear
sprocket kind of galled me . So the extra money spent on this setup was well worth it to me.

There's certainly something to say about having something that works right and looks good too. That's why I just don't oil my chain too much and change it often.

Dave
69S