Commando air filter

The rubber should be supple and not hard. I use rubber o-ring lubricant to help keep it supple. If your rubber boots are 40 years old then you will find new ones from Andover much more manageable.

1. Take off your Left hand side cover.

2. Place the rubbers boots on the carburettors first.

3. Align the flat sections of the rubber boots inboard facing each flat.

4. Hold the front plate / mesh / and filter as an assembly in a horizontal state with the top going first when offering it up on the primary side. With the top going in first tilt it towards its home by rotating when the clearance is there.

5. Make sure the screen is tucked in nice and neat within the two front and back plates. Check both sides.

6. Tighten the two bolts up snug.

7. Fit the lips of the rubber boots into their respective holes on the front plate. Use a thin piece of wood like a chopstick sharpened like a screwdriver blade to help manipulate the rubber back into their home.

I changed the standard horrible to fit air filter and fitted a K&N

Glenn, some extra suggestions for this sometimes tricky and painful operation:

1. The above method can work but access from the left-hand side may be blocked by the ignition switch on some models. So attempt from the right-hand side using the above method.

2. I've also had success fitting the rubbers to the carbs and manoeuvring in the filter and gauze first. Then inserting the front air filter plate, manipulating the rubbers in and bolting up the filter.

3. Also it can help to undo the allen screws at the carb manifold to cylinder head joint to help move the carbs around to aid fitting the seals to the bolted-up air filter.

4. The carb adaptor sleeve (Part No 033027) is best fitted with the large ring end inwards. See parts diagram on Andover Norton website.

5. I'm looking at fitting the RGM half-width filter as a long-term fix to make life easier but need to sort spacers and check carb levels for not affecting the float operation.

Andy

Glenn

I too found it very time consuming and very fiddly fitting the standard air filter, but I think it looks better than the K & N filter which leaves the filter back plate visible.

I fitted the RGM slim unit which is made in polished stainless. This looks like the original but is around one inch thinner.

It looks good and with this you can attach the rubbers to the front plate and then attach the front plate and rubbers to the carbs.

Lastly you just slide the air filter and screen up into the space between front and back plates.

Steve