RM 80 1985 Clutch problem
 

hello, im new to this site and im looking for some advice/help.
I have a rm80 1985 model, when the bike is still(not running) i put the bike into 1st gear pull the clutch in and the bike wont move like the clutch isnt working, but the clutch worked fine when i bought it bearing in mind the bike was warmed up. is this normal or is something wrong, bit of a inconvenience as my kick start needs fixing so it needs to be bumped to start it

any help is appreciated

the clutch works fine once its running but stops working once the engine cools again