Norton Commando 908cc Cafe Racer

billbell1960 · Jul 21, 2012

The Norton's a runner, I've upped a short clip onto my site http://nochangegiven.com/ncg/

Foxy · Jul 21, 2012

Gday Bill, thanks for that and I enjoyed the ride around the country side. Thats one very nice piece of machinery you've meticulously created! Would love to see and hear more of it idle as to catch that 270 degree beat! :mrgreen:
regards foxy

acotrel · Jul 21, 2012

I watched the 'first test ride' video - get rid of that helmet ! Pudding basin helmets have been responsible for a lot of deaths, and riding something like that, you have just got to wring its neck !
I wondered whether you have changed the balance factor of the crankshaft. The motor in my Seeley is rigidly mounted, and the crank is balanced to 72 % by filling a steel plug in the hole in the flywheel. When it is idling, the bike rocks back and forwards, but when revved it is as smooth as silk. The original commando was balanced at 58 %. If you rev them as standard, you can split the cases horizontally through the main bearings. Better that the bike shakes at low revs, than that happens.

billbell1960 · Jul 23, 2012

Foxy said:
Gday Bill, thanks for that and I enjoyed the ride around the country side. Thats one very nice piece of machinery you've meticulously created! Would love to see and hear more of it idle as to catch that 270 degree beat! :mrgreen:
regards foxy

Many thanks Foxy, I'll record a clip later in the week

billbell1960 · Jul 23, 2012

acotrel said:
I watched the 'first test ride' video - get rid of that helmet ! Pudding basin helmets have been responsible for a lot of deaths, and riding something like that, you have just got to wring its neck !
I wondered whether you have changed the balance factor of the crankshaft. The motor in my Seeley is rigidly mounted, and the crank is balanced to 72 % by filling a steel plug in the hole in the flywheel. When it is idling, the bike rocks back and forwards, but when revved it is as smooth as silk. The original commando was balanced at 58 %. If you rev them as standard, you can split the cases horizontally through the main bearings. Better that the bike shakes at low revs, than that happens.

Thanks for the tip, the pisspot helmet was just a stunt.
Yes the crank has been balanced for the featherbed frame, as you say it has high vibe factor at low revs and smooths out when giving it the berries.

beng · Sep 9, 2012

billbell1960 said:
Following the demise of a 650cc engine in a featherbed frame, we're rebuilding the bike with a 908cc engine from Norvil

It was not a 650cc engine, it was a 600cc.

Norton Commando 908cc Cafe Racer

billbell1960

Foxy

acotrel

billbell1960

billbell1960

beng

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