hi as your aware the bush wears in the gear linkage cover on the tys especially the ty175
there is some fixes but some are expensive
ive tried something that works superbly and makes gear changeing a lot more responsive
as the main oil seal is behind the cover the outer oil seal behind the lever is more of a dust seal as no oil should be behind the cover
if it is then the inner seal has gone .
i removed the outer seal and fitted a 12mm x 19mm x12mm bearing that i pressed into the casing where the external oil seal should be pressed it in with my vice and two pieces of wood
so not to damage,
the bearing fits tight and the shaft is nice and snug this allowing the gear change shaft to turn smoothly and also supports it taking out any excess play that has accured over the years.
used it today and rode it hard lots gear changing and the differance is un discribable its like new .
for £5.25 it is ideal might not be for everyone but it deffinatly works first class
cheers