Hi can someone help please I’ve got a 700 diesel its not getting high revs or top speed so I’ve serviced the bike a slight improvement now it’s averaging 20-26mph but that’s it the injectors are fine I’ve tweaked the valves cleaned out the muffler so what it is it’s getting up to 44mph when I lift the back wheels of the ground but when it’s being rode it’s going 20-26mph so I’ve took the side casing off to access the variater and when in neutral it revs heigh and the belt goes all the way to the top and when in high with the wheels of the floor it reaching high revs and speeds over 40mph but when it’s on the ground in high range it’s not getting high revs and the belt isn’t getting all the way to the top of the variater. So if you any ideas it’ll be great thanks in advance