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Light Twins

Description

A technical forum for Jubilee, Navigator and Electra

Electra Roller

Forums

Looking for some advice here.

Found an Electra "roller" in my area that consists of both wheels, both fenders, a fuel tank, rear shocks, and front forks.  The fenders seem to have surface rust.  The wheels are pretty much rusty trash, but the hubs and brakes look serviceable.  The gas tank seems to be undented, but the interior condition is unknown.  The front fork is unknown, but looks pretty crusty.  the rear shocks are toast.  The frame is heavily rusted.

Banjo bolt

Forums

I have just bought new oil union banjo bolts from the NOC shop (reference no 18101) and they don’t appear to fit. They go in about one and a half turns then refuse to budge. In my experience that is a sign of the wrong thread (but I could be wrong). The internal threads don’t appear to be damaged (I’d like to keep them that way). One of the heads is new.

 Is this a known problem?

What is it?

Forums

Hello everyone,

I'm a new / returning member after selling my MkIIA back in 1989.....so,

I recently bought this 350cc Jubilee / Navigator and that is the crux of my question...what is it?

I have read some threads on the Forum here and see that Navigator barrels have 7 fins and the engine in my bike has 7 fins.

But the frame does look like a Jubilee and on cleaning the front wheel I noted it was stamped with WM2 Do Not Use Over 250cc (or words to that effect).

I have the V5 which states it's a Norton 349cc but no other model details.

Sleeve gear

Forums

Another question.  I've just slipped the gearbox innards out of the Navigator to lighten the load for when I remove the engine from the frame.  I am relieved that an initial inspection revealed no horrors, all seems well.

Looking at the sleeve gear I noticed that it has male "dogs" to engage the adjacent gear (MS 3rd?).  I have a spare crank case (Jubilee, 84946 R17).  This case had a sleeve gear in place but of a different design, slots for the adjacent gear to engage in rather than the dogs on the Navigator gear.  Otherwise, the gears appear to be identical.

Cylinder Head Clamp Plates

Forums

I’m rebuilding my jubilee (early engine) following both the manual and Mike Marriott’s photo guide. In frame 5 of the guide it says to “prize cylinder head clamp plates (washers below) from heads”. I’m putting together a basket case and can’t identify any likely parts. While the parts list lists them, they don’t appear on the exploded diagram. Can anyone provide a photo or drawing of the clamping plates please? What function do they perform? I would be most grateful for any advice. Mike Formby

petrol tap

Forums

In the NOC shop part no. SS14 C3 041323L is described as "Petrol tap: Lightweights only: 7/16 petrol tank thread - Use 1/8 BSP fittings: Lever type: All metal plated brass, New". I have bought one as my old push-pull tap continued to leak even with a new cork insert. The description is incorrect and has mislead me. I have found that the petrol tank thread is 1/8 BSP and the 7/16 thread is the one on the outlet. Unfortunately I have bought a Dowty washer that now won't fit the tank end of the tap and a 1/8 BSP spigot and nut that don't fit the outlet.

petrol tap

Forums

In the NOC shop part no. SS14 C3 041323L is described as "Petrol tap: Lightweights only: 7/16 petrol tank thread - Use 1/8 BSP fittings: Lever type: All metal plated brass, New". I have bought one as my old push-pull tap continued to leak even with a new cork insert. The description is incorrect and has mislead me. I have found that the petrol tank thread is 1/8 BSP and the 7/16 thread is the one on the outlet. Unfortunately I have bought a Dowty washer that now won't fit the tank end of the tap and a 1/8 BSP spigot and nut that don't fit the outlet.

Rocker spindle

Forums

Good morning all.  I've been doing some work on the cylinder heads of my Navigator.  I see that the "inner pillars" that support the rocker spindles have top hat shaped bushes pressed in to place, see photos.

Any ideas on the purpose of these bushes? 

 

Jubilee Big Bang engine

Forums

Hi All,

Before I start, yes I accept buyer beware and that I have been well and truly conned. However, has anyone heard of any enterprising engineer trying to make a Big Bang Jubilee engine? When I bought my little Norton the V5 stated that it was a 500cc, hmmm I thought, a slight error by somebody. Today I have taken the heads off and was surprised to find that the pistons come up the bore together, now I’m an electrician but should they not alternate? Has someone tried to make a Big Bang engine? Please see the attached photo.

 

 

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