Hi Chas, if it CLONKS into first gear, they all do that, but if it clonks in ALL the gears then you might have a problem, when you think about it to change gear you move a moving shaft (crank) into a non-moving shaft through the gearbox, if you do it slow you get a CLONK if you do it fast you will not get such a loud CLONK, this is because if you bang it in it cannot grind where as if your gentle with it you get a grind. The best way to ease the clonk noise is to pump your clutch lever a couple of times to make sure the plates are separated, especially first time you start it as over night they can stick, then get your revs a low as you can to reduce the amount of turn on the crank shaft and get it into gear quickly but firmly, this is the only way I know of avoiding a loud CLONK, you could if you lived on a hill, roll down the hill before you select first gear, but people only usually do that when they are stealing your bike!!