Light Twins

My Navigator conrods have been bushed with bronze to compensate for worn gudgeon pins.  I've rebored the cylinders and fitting JP pistons.  The pins are too tight for the bushed rods so I have decided to re-bush (with aluminium) to suit the new pi

Hi all, it's been a while since I posted on this forum but my Navigator rebuild has stalled as I try to solve a gearbox layshaft bush / mainshaft bearing alignment problem which doesn't mean disassembling the engine again.....but I digress!   As i

What is the correct diameter for a headlamp for a jubilee. My headlamp shell measures 6” diameter, but the replacement reflectors on offer seem to be 61/2 or 7 inch. Any advice would be welcome. 

I have read somewhere that a modification was made to the return fitting in the oil tank during production of the lightweights, a restrictor to encourage oil up to the cylinder?  It carried over to the heavyweights, or the other way around?

Hi everyone can someone please tell me where to find the engine and frame numbers on my 1964 Norton navigator 

Thanks Mike 

Pair of complete heads on Ebay.

Ive recently removed the pistons from a 1960 engine. the only visable mark on the crown is a letter B. No markings to say they are a plus oversized. Anyone know what the letter B is. There is a very slight concave in the crown, is this normal.

Now that I have got my Jubilee engine reliably kicking over, I noticed that the pipe above the drive sprocket (see picture) is producing oil (which is now all over the patio).

Can anyone tell me if  the advertise part no 040079 oil seals are the correct cross section ones Many Thanks Duncan.

I am having a problem with oil leaking from the o rings on the inner shaft of the gear lever selector

shaft, I have changed the o rings twice it last about 20 miles then it leaks again any one got any ideas. Kind Regards Duncan.