riffraffretro Posted November 6, 2017 Report Share Posted November 6, 2017 (edited) Apologies for another question relating to my newly acquired 247! It's a '71 model, with new Amal carb. I'm trying to determine whether the air box and filter fitted to the bike (see image), are standard, or whether they represent another Heath Robinson'esque bodge-up by the PO! The air box is manufactured from steel, with solid top and bottom sections, encasing perforated steel sides, within which there's a filter, comprising a 'waffled' paper-type element, wrapped in a fine steel mesh - nothing at all like the foam type filters I'm used to using. I'm unable to find anything similar online (Google search, etc), and wonder if this is something the PO has fashioned-up, or whether it's the original factory set-up. The airbox to carburetor pipe/ducting is absent in any case, so if I were to retain the present set-up, I'd need to source a suitable pipe - 40mm I/D by approx 250mm in length - any suggestions? Alternatively, I could opt for a cone-type filter (RamAir manufacture a wide range), but question whether these are really suitable for off-road applications, given that they're designed to be used 'dry'. Again, thanks in advance for any assistance. Edited November 6, 2017 by riffraffretro Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted November 6, 2017 Report Share Posted November 6, 2017 That isn't the original filter set-up, which consists of a roughly egg-shaped alloy casing in two halves, containing a foam filter between two metal screens. There is one on eBay at the moment (from Spain) but priced to set your pants on fire. If you want one of the originals I think I have one which I'd sell for a more reasonable price - pm me to discuss if you like. You definitely wouldn't want the open filter type on a trials bike - the filter needs to be protected from all the snot which gets directed at the engine area. Quote Link to comment Share on other sites More sharing options...
riffraffretro Posted November 7, 2017 Author Report Share Posted November 7, 2017 Thanks again Cleanorbust... another case of Heath Robinson strikes again by the PO! Quote Link to comment Share on other sites More sharing options...
oldaz Posted November 10, 2017 Report Share Posted November 10, 2017 (edited) On 07/11/2017 at 8:22 AM, cleanorbust said: That isn't the original filter set-up, which consists of a roughly egg-shaped alloy casing in two halves, containing a foam filter between two metal screens. There is one on eBay at the moment (from Spain) but priced to set your pants on fire. If you want one of the originals I think I have one which I'd sell for a more reasonable price - pm me to discuss if you like. You definitely wouldn't want the open filter type on a trials bike - the filter needs to be protected from all the snot which gets directed at the engine area. If you go to the "Montesa Cota 247" topic you'll see a picture of my bike when I cot it and you can see the pressed steel one for my '75 model along side it. I believe there's supposed to be a curved mesh piece in the opening. I created a separate picture from the original. Edited November 10, 2017 by oldaz Picture added Quote Link to comment Share on other sites More sharing options...
riffraffretro Posted November 10, 2017 Author Report Share Posted November 10, 2017 Thanks Oldaz... a fellow TC contact has a spare airbox which he's kindly made available, so I should be up-and-running shortly. Quote Link to comment Share on other sites More sharing options...
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