Right you clever lot ???

[Trev]

IF a carbed bike then looks a but weak to me but modern injected bikes often run pretty lean. Is it possible that the fuel cap breather hole or breather pipe is blocked? When it cuts out, open the fuel cap and see if you hear air suck in when you break the seal. Unlikely but have had it on a couple of bikes in years gone by, also on my Gioxer11 when I kinked the breather pipe on the fuel cap

[DC]

IF a carbed bike then looks a but weak to me but modern injected bikes often run pretty lean. Is it possible that the fuel cap breather hole or breather pipe is blocked? When it cuts out, open the fuel cap and see if you hear air suck in when you break the seal. Unlikely but have had it on a couple of bikes in years gone by, also on my Gioxer11 when I kinked the breather pipe on the fuel cap

Cheers Trev , the bike's an EFI. I came across the breather from the tank and it comes out down around the centre stand and is cable tied on loosely , on one inspection the end of the pipe was sitting squarely on the main pivot housing of the stand , so I moved it , but maybe I need to re-locate it and fix it more securely . I also removed the fuel cap today but didn't really hear any vacuum . Will have another look tomorrow and go out for another local ride . Thanks for your input.