Big Woody

Oldgitonabike no like i say i have very little knowledge about mechanics so just to his word on it

Cardboard dave that may be the case but why should it slow down, so much so i need to change down to build speed and revs back up?

15000 miles and sorry how do i tell which filter it has?

I have recently acquired an 2000 Yamaha TW125 Trailway, I was told it needed the carb setting up when I bought it and duly booked it in for the work. When I got it back I was told "he has done his best with it but it really needs a new carb" now it does run a lot better and seems to run up to around 40/50mph fine but when I put it into top gear it slowly starts to slow down (as if fuel is getting restricted) until I have to drop it down gear to build the revs up again. A. Does this sound like a carb problem ? would hate to track one down and find it does not fix the problem. B. What carb should I look for to fix it ? Cheers for reading this and sorry if it's a dumb question but I have very limited knowledge of mechanics.