This is a link to a previous answer in the old forums which might help you out: http://tw200forum.co...0/ShowPost.aspx . Also, a 'pinned topic' in the current Technical Help forum has the Service Manual available for download.
This old forum link also includes an active link to a pictorial "how-to" somebody did on a XT225 ---obviously you would want to use the correct TW specs, but the process is supposedly similar.
Pictorial Valve Adjustment How-To on the XT225: http://www.xt225.com/forums/ubbthreads.php?ubb=showflat&Number=10228&fpart=1
This old forum link also includes an active link to a pictorial "how-to" somebody did on a XT225 ---obviously you would want to use the correct TW specs, but the process is supposedly similar.
Pictorial Valve Adjustment How-To on the XT225: http://www.xt225.com/forums/ubbthreads.php?ubb=showflat&Number=10228&fpart=1