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S&B Conical Airfilter

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S&B Conical Airfilter

Posted by Nick Clarke at August 10. 2018

Apologies if this is a well known mod but I thought I would share the attached photo of the conical air filter that I have fitted fit to my Navigator.   I found it on Hitchcock's Motorcycles outstanding online shop following the links: Amal Carburettors - Associated Products - Air filters and Air intakes - Performance Air Filters (Conical).   A good quality S&B air filter which will fit the Amal 375 is listed at a very reasonable £16.80.   They also list a variety of aluminium bell mouths of different lengths.   Very straight forward to fit, it only requires the removal of the seat, the bell mouth to be unscrewed and then the filter eased over the threaded stub and secured with the jubilee clip provided.   I haven't noticed any reduction in performance or need to alter the carburation.   There is a slight reduction in the signature open mouthed Amal induction 'roar' but otherwise an almost invisible improvement in engine protection.

Nick

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Re: S&B Conical Airfilter

Posted by John Pullen-Appleby at August 11. 2018

Previously Nick Clarke wrote:

Apologies if this is a well known mod but I thought I would share the attached photo of the conical air filter that I have fitted fit to my Navigator.   I found it on Hitchcock's Motorcycles outstanding online shop following the links: Amal Carburettors - Associated Products - Air filters and Air intakes - Performance Air Filters (Conical).   A good quality S&B air filter which will fit the Amal 375 is listed at a very reasonable £16.80.   They also list a variety of aluminium bell mouths of different lengths.   Very straight forward to fit, it only requires the removal of the seat, the bell mouth to be unscrewed and then the filter eased over the threaded stub and secured with the jubilee clip provided.   I haven't noticed any reduction in performance or need to alter the carburation.   There is a slight reduction in the signature open mouthed Amal induction 'roar' but otherwise an almost invisible improvement in engine protection.

Nick

 

This is interesting Nick.  It may have saved me a question--I have done a similar thing with the foam Ram Air filter that also fits inside the frame member like yours.  I have fitted an Amal 1600 series mk 1 1/12--I use them on all my bikes (2 Triumphs 1 Triumph Metisse and a BSA B40 engined C25).  How the Navigator will fare with one I know not but I have the jets recommended by Amal.  I bought the filter at an autojumble (new) and it fits via an adaptor that I got with the body of the carb I have on the BSA (the carb was originally on a CZ125 and was found in a skip).  I have splashed out on anodised slides for all of them.  I use my bikes for work and usually reckon a new carb pays for itself in lower fuel consumption in a year or two--probably a year or  4 as I do few miles these days.

 

I have one of these on the BSA once and it worked fine--it eventually got too threadbare and I could see through the holes--but it was far from new when i got it.

 

Cheers

JPA

Re: S&B Conical Airfilter

Posted by dennis_thompson at August 19. 2018

I bought a spin-on conical air filter for the Amal Monoblock on my Jubilee from 'Classic Bikes' on eBay for £13.50. Nicely made and fitted in seconds.

 

https://www.ebay.co.uk/itm/Spin-On-Motorcycle-Air-filter-375-Carburettor-36mm-/391268189220?hash=item5b1966c424

Dennis

Re: S&B Conical Airfilter

Posted by patrick_mullen at August 19. 2018

And that price includes postage.  Certainly looks good. I have a feeling it will be manufactured in China but if it does the job properly it is very good value.

 

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