SOHC.co.uk Forums > CB500/550

Cone filters

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Mozza:
Hello just a quick enquiry about the legality of the cone filters attached directly to the carbs I keep seeing on cafe racers. Are they road legal? I run open air filters on my xt660x and they aren't technically road legal but are hidden under bodywork so I would have thought it would be the same for the cones. Plus if I do fit them is there any extra considerations I need to make regarding the carbs seeing as though they mount directly to them.

K2-K6:
Don't think they come into a legal framework for the road, more likely to be observed by insurers as modified and subject to their own policy disclosure practices to make sure you are covered legally.

I'd guess that in the grand scheme of things then if original kit was not used a suitably safe alternatve would be reasonable in the view of many.

Bryanj:
The only "legal" part of the induction system is that the roar may increase the driveby noise to above the legal limit---but as there wasn't one in the 70's that don't matter

SteveD CB500K0:
You get up too early Bryan...

I would have said: "Modern bikes make more induction noise than exhaust noise (at least with standard cans) which is why they have such huge airboxes. For MOT purposes (theoretically) any modification that allows more noise than standard is a fail."

But as Bryan says - those rules are not retrospective.

florence:
That's why I love old bikes, you can use whatever filters and exhaust pipes you like as long as you don't go mad.  I've got aftermarket filters and a laser pipe and the MOT man doesn't even mention it. 

In addition to this you only need one working brake light switch and no side light or indicators are required.  I have even MOT'd a bike with a homemade exhaust pipe.  All in all this makes them very cheap to run and maintain.

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