350 or 500 ccm?

silverarrow · Post by **silverarrow** » Mon Jul 17, 2000 6:18 pm

Hi Christian,

Thought I could help by having a looksee at my barrels.

But.....

On my bike - no letters.
500 - 024206
500 - 39 8 E1
350 (46) - 024078

Perhaps someone else can corroborate your reference.

Alternately the exhaust diameter is a larger bore on the 500, unless of course someone has modified a 350 head to fit?

Les Smith

TommoT · Post by **TommoT** » Wed Jul 19, 2000 3:18 pm

Christian,
why not pour oil or another suitable liquid into the cylinder and measure the amount poured in?

Just an idea!

Tom Mortensen

Peter Wright · Post by **Peter Wright** » Sat Jul 22, 2000 7:27 am

Just stand back and look at it, sighting through the fins. If the cylinder looks rather anorexic on the large crankcase then it is a 350. Also, measure the outside diameter below the fins. Is there enough metal to allow an 82.5mm bore? If so, its a 500; if it measures less than 80mm its a 350. Some 500 barrels have a vertical rib between the fins and/or cutaways front or rear to clear the magneto.

27col · Post by **27col** » Mon Nov 20, 2000 8:56 pm

Does anyone out there know where to get hold of a full loop crash bar fit a Model 31. Or perhaps someone can still make them. Please let me know if you can help. Preferably stainless.