Purchased a 2004 Wee-Strom this summer with 24k on it. The exterior was rough but it ran good. Am doing my first valve job on it and am unable to adjust 3 of the 4 exhaust valves. Even if I install the tappet with "no shim" the best clearance I can get is 0.15mm. ( I need 0.2-0.3mm) I am afraid to ask, but does anyone have any ideas? Did the previous owner neglect it and warp or bend the valves? Or am I doing something wrong?