Hi,  new member and first post,  so here goes.  
Just purchased a 1981 MH349.  Bit scruffy and didn't want to start but it was a cheap bike to see if I could do this trial thing.  I would guess it hasn't been used for a couple of years.  
Got it running OK.  New plug, fuel and a minor carb refurb.   Was running it up and down my quiet steep drive to check out the fueling, still not sure that it is setup right, but after a couple of hours of stopping and starting it's now stuck in first gear.  
Whatever I do it feels like the gear change lever is not doing anything.  
Any idea what to do?   
I don't know if the oil is any good.  Is it worth changing that first?   I see there is two filler screws (cluth and gearbox?),  do I need to refresh both seperatly.  pointer on volume and type would be appricated.  
Thanks in advance.  
Roger