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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Engine breathers

Forums

Just out of curiosity ,does anyone know why the breathers on the 750/850 engine's are on the exhaust camshaft instead of the inlet, as on the smaller twin engine's. Other than that they are quite similar. 

Cutting Out when Hot

Forums

Hi All

Hope you can help. I have brought a 1969 500cc Dommie, I took it out last week and it ran fine for 20 minutes, then cut out. It was very hard to restart. Before I start doing anything I did find the battery was 3 single cell torch like batteries they looked very old!!!, I will have to fit a new battery. 

Thanks 

Hope you could point me in the right direction 

Cheers

Steve

Rear wheel queries

Forums

I am currently building a Triton (reliving my lost youth) and foolishly started with a motley collection of featherbed bits. Amongst the bits was a cotton reel rear hub together with the spindles and the internal spacer and the external spacers.

I therefore purchased the missing parts from a well respected supplier and assembled the hub. Having got it together I now find it is some 5.5mm too wide to fit in my swinging arm. I have two swinging arms and the problem is exactly the same on both so I don’t think they are the problem. 

650SS Refurb

Forums

This is probably obvious to 'hardened' Norton owners, but I thought I would share my recent experience in the hope it might help someone just starting out.

I bought a 650SS in July '16. It appeared to be in good, standard condtion, but proved to be very much otherwise!

Front brake drum.

Forums

On a certain auction site is a 'Dommie' front brake drum for sale £70, rather a lot for a well tired item with no wheel bearings. But note it is 'part cast iron so does not fade', What hasn't been mentioned is that this hub is for the early brake plate as well. Despite their appearances the drums and brake plates do not interchange. It's not until you try the brake plate/drum combination and have it wrong do you find the error of your ways.

By the way I picked up this one as I was looking for a latter front wheel with WM2 alloy rim. Any one know of one?

Oil Pump

Forums

The oil delivery into the oil tank at a fast tickover on my 1956 Dominator 99 is a continuous full stream. The feed to the engine is fitted with an oil tap so there should be minimal oil in the sump on start up but the oil return to the tank is instantaneous and is a continuous jet. Does this indicate that the pump has been upgraded to a higher delivery type ? I understood that the standard pump gives a dribble return after start up.

650ss barrel spigot cracked

Forums

Hi,

Does anyone have any experience/advice on converting spigoted barrels to spigot-less?

I have a set of barrels which are +60 thou oversize, resulting in a thin spigot wall. Sadly one spigot has a circumfrential crack around approx one third of the circumfrence. Also the mating face of the barrel is pretty rough looking, and not flat.

I'm considering having the spigots machined off and the mating face very lightly skimmed to clean it up. I understand that in the past Norton produced some ring insets to fit to the head in place of the spigots.

 

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