Hello I hope someone can help. I ride a Honda CB250, don't hold that against me. Around town its a dream, light and cheap on fuel and a good bike to learn on. Problem is on the Highway. When I travel 80 kph or more the clutch lever becomes rock hard and I cannot disengage the clutch. To fix problem i turn ignition off and coast to a stop. Rock bike back and forth until i can find neutral. Once gear is in neutral i restart the bike and pull in clutch lever. After a few squeezes of the clutch lever all is fine. The problem goes away. Then I can commute again and all is fine until i reach 80kph again. Did a big ride Sunday morning up the Putty road to Garland Valley, most of the time without a clutch. Not sure if this is a safe thing to do, I don't like not being able to not choose neutral when i like. Has anyone experienced this fault before or can advise me what to look for. Changed oil last week.