on it Posted July 17, 2017 Report Share Posted July 17, 2017 on 17 betas there is a fuel cap breather in the cap but also 1 in the filler neck why ? Quote Link to comment Share on other sites More sharing options...
feetup_mostly Posted July 17, 2017 Report Share Posted July 17, 2017 Hi on it, any chance of a picture? Quote Link to comment Share on other sites More sharing options...
reggie Posted July 17, 2017 Report Share Posted July 17, 2017 Something to do with the Euro 4 testing. 1 Quote Link to comment Share on other sites More sharing options...
fantic300r Posted July 17, 2017 Report Share Posted July 17, 2017 The extra breather pipe increases the flow of fuel, if you ride 300 evo add an extra capacity float bowl and this sorts the bike for big 4th gear climbs. 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted July 18, 2017 Report Share Posted July 18, 2017 Sure it does increase flow, but they have had bikes suffering vapor lock for no apparent reason. I would guess this is a remedy for those few cases. Quote Link to comment Share on other sites More sharing options...
feetup_mostly Posted July 18, 2017 Report Share Posted July 18, 2017 So is it only the 17 Beta's with this? Quote Link to comment Share on other sites More sharing options...
billyt Posted July 18, 2017 Report Share Posted July 18, 2017 You are witnessing not Euro 4 testing but also the very early signs of FI testing on Beta 2T's. Things that make you go mmmmm ............... Quote Link to comment Share on other sites More sharing options...
dan williams Posted July 18, 2017 Report Share Posted July 18, 2017 1 hour ago, billyt said: You are witnessing not Euro 4 testing but also the very early signs of FI testing on Beta 2T's. Things that make you go mmmmm ............... Ahhhh good point. Next year maybe if they are modifying production frames. Quote Link to comment Share on other sites More sharing options...
overdale Posted July 19, 2017 Report Share Posted July 19, 2017 This arrangement has just appeared with the 2017 models and is not an additional vent for the fuel tank. If you look at the pdf attached, the o-ring of the fuel tank cap sits in the recess at the top of the thread in the fuel tank, and that drain/vent connection is above the sealing face. The drain pipe goes down under the left hand side panel and is open ended. I think that the arrangement is maybe for some EU directive to allow any fuel/ mist to go down the pipe rather than spray into your eyes if you remove the cap if their is any pressure in the tank. Just a thought! 2017 Beta Evo fuel tank cap..pdf Quote Link to comment Share on other sites More sharing options...
billyt Posted July 20, 2017 Report Share Posted July 20, 2017 If they go FI the tank will have different fuel cap. Quote Link to comment Share on other sites More sharing options...
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