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A technical forum for all single cylinder Nortons

ES2 crankcase oil tapping

Forums

Now in my ES2 ('61) rebuild, another query - and I thought it was an easy job when I first saw the bike.

Turning the engine over - not running - oil is running out of a small tapped hole on the timing side crankcase.  It is situated behind the timing case cover, pointing rear and down - about 8 o'clock - mainly hidden by the frame tube.

It seems to be 9/32", I can't see what TPI, probably BSF or Cycle (1/4" is too small and 5/16" is too big).

It is not shown in any of the exploded views I have seen and no such size is shown in the Norvil spares list.

ES2 Engine breather

Forums

I have read somewhere that the breather pipe exiting the engine at about 2 o'clock looking at the drive side crankcase should have a ball valve in it. My rebuild does not have one, and when I kick the the engine over there is a loud gasping sound from it. When I block the outlet pipe there is no gasping sound.

I think this breather pipe will allow the engine to be open to atmosphere as there is no rotating disk or any mechanism on the crank end.

I suspect that if I ran the engine like this the entire oil tank would be on the garage floor very soon.

16H/Big4 engines

Forums

A friend of mine has just bought a bike he was told is a 1934 Big4.

The crankcase is stamped 82 x 113.

However, measuring the bore and stroke he found that it is 79 x 100mm.

So it seems that a 16H crank, barrel and pistons have been fitted.

Is this possible, can it be done easily, are the parts interchangeable?

The bike does not run well, blows out a lot of oil and smoke.

What can he do - scrap it?

Base Gasket

Forums

Afternoon.  Would it be safe to assume that a cylinder base gasket for a 1948-on M18 would fit a 1947 bike?  I'm hoping that the only change was the addition of oil holes from '48.  Thank you. 

tightening magdyno bolts

Forums

Hi all - found the magdyno on my mid-fifties ES2 had worked loose. Is there any way of tightening the bolts without removing the whole timing cover and re-timing the ignition? I really don't want to unless I have to! But the access is terrible.

I'm just getting lazy in my old age!

George

 

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