Cobbled this together from a threaded ring, welded on extension tube and a Ramair oval filter, better than nothing I guess
PhotoThat will keep the rocks out…
That will keep the rocks out ,and treble the life of rings and bores. Back in the day, Norton would say a filter is not needed in the uk. But they had no idea we would be still running the bikes 60 years later. And they made much of the profit on sales of parts ,which are now very scarce ,particularly cylinders.
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Yes but
The nicely welded ally tube that comes off the Monoblock ignores one carb basic. At the bottom of the inlet there is two holes leading to the float area. If these are allowed to breath outside the air cleaner tube there is often a modest increase in engine pick up, especially at lower engine speeds.This is a common fault with the fitting of 'go faster' air tubes onto concentric carbs. The genuine AMAL version puts these same holes to the outside air, carb works properly. 'Go faster' air trumpets look good do nothing.
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Ramair filter
Effective, well made setup Peter. Als statement is incorrect, needle jet and pilot air drillings on Concentrics do indeed work properly using filtered air rather than direct from outside a filter. Essential in these circuits and a no brainer on a street bike.
Even the Amal offset long velocity stacks he mentions benefit from this. The DIY K&N filter on my 850 uses modified threaded rings as you have. It filters air to both the long stacks and air drillings Works superbly with good power, economy and a reliable idle
The Mk3 850 also has an excellent oil tank breather take off that I connected to the back of the filter. No oily fumes or dripping hoses to the rear mudguard. Not sure this would work on your bike
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