November 11, 200916 yr Hi, just took seat/tank unit off and no air filter fitted. what filter and do I need extra bits to locate/hold the filter? Also found engine no. but where is frame No? Cheers
November 11, 200916 yr Author Hi Greeves thanks for help, similar to that with single lug at front slotted for bolting to frame, does the filter just sit in there or is there a frame inside? Cheers, Myson
November 11, 200916 yr I believe the filter is a flat piece of foam that is held in by a flat wire frame on top. I'm not 100% sure but I think this is the one you want avaliable at bultaco.com and maybe speedandsport Edited November 11, 200916 yr by fergie
November 11, 200916 yr Hi, just took seat/tank unit off and no air filter fitted. what filter and do I need extra bits to locate/hold the filter? Also found engine no. but where is frame No?Cheers Frame number is on headstock. Turn bars to full lock and exposed letters and numbers are embossed vertically. May need to scratch paint if resprayed or powder coated. The filter is sandwiched between two perforated plates and located by spring which runs around inside of top of filter box.
November 12, 200916 yr Author Thanks to all, are the two plates available as seperate parts as mine are missing? Myson
November 12, 200916 yr Hi - Try Bultaco UK but I think they only available 2nd hand now - but are very easy to make. Make two patterns from cardboard then buy a sheet of expanded (the zig-zag pattern) aluminium (from B&Q) and cut them out with tin snips. A whole sheet of twin-air foam filter can be bought from http://www.trialsbits.co.uk/ from which you can make as many as you like! The spring is a bit more of a problem. I made mine from piano wire available from good hobby/model engineering stores.
November 12, 200916 yr Author Good advice. thanks. good little project for my son(fab/welder and good with tig on ally) will let you know hw it goes. Thanks again. Myson
November 13, 200916 yr This is the air filter from my M80. I was able to cut my own filter from bulk UNI filter mat which I got at my local motorcycle shop for like $20 can. I could easily make a lifetime supply of filters from the one chunk. I only had one sheet of perforated steel with the spring. The old filter had totally broken down.
November 13, 200916 yr Author Thanks Sunny, I can get good idea of what I need to do now, this forum is superb! Myson
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