My friends ty250 "74" will not shift from 5th when hot...?

I am working on the bike with out a manual. If anyone has a manual and can shoot me some spec's on the clutch it would help alot!

The bike shifts good when cold.

Thank you

Thanks for the PM - thought I'd answer here so it might be of use to others.Do all other gears shift OK when hot,inc finding neutral ? If it does then its not clutch related,sounds more like a selector drum/fork issue.I dont have a manual for 250's,all I have is the Haynes one for 80-175's.What might be a help is to look at www.cmsnl.com and follow the index through,they have a parts fiche which you can look through - it shows the whole bike with part numbers etc.

It does seem odd that its only when hot if it is a selector fault as the box doesnt get that hot.What oil do you have in it ? When I first rebuilt mine I used some synthetic 10w/30 car oil that worked really well,but 2 trials ago I drained it and refilled with ATF.Now the clutch action is not so good so they obviously prefer certain oils.

I have to say... I have never ridden this bike, as I am working on it for a friend. I am putting it back together tonight and am going to take it out for a ride in the AM so I can have first hand knowledge of the issue... As to what I know the bike shifts good except for down from 5th when hot...?

I think your right on that the issue is in the shift drum family. When I find what the issue is I will post it for all, however in the meantime any clue helps!