Ecotek valve
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Sorry to say this but I've had one fitted to my MX for about 3 years and I cant say I've noticed any difference in the amount of fuel I've been using. The only reason its still fitted is because its easier than removing it and fixing the pipe I cut. If the duck fart noise is really annoying you I think ecotek sell a small filter thingy that fits to it thats supposed to muffle the sound.
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yea,but makin ur own wont cost about £25 for a chunk of polystyrene:D so if no change to fuel usage,anything else improved at all?
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well not really mate, look pretty thats about it, youll see mine in the video i made today, ill link in my Project page
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damn…maybe time for it to go back on ebay then,they seem to sell pretty well.£20+ mine was 2nd hand so not even got the pretty aspect of it,it looks old and tatty :x