Hi.took bike out today and after about 10 miles noticed clutch started to slip.I also noticed all free play at clutch lever had gone.Changed oil and filter recently and used motorcycle specific motul 10/40 oil.Has anyone got any ideas what could be wrong.
It is NOT the oil you used!!!!!
These really don't have the same feel of free play that the cable operated clutches do. Did you by chance add aftermarket levers? If not that then the clutch pushrod sticking and/or the slave cylinder piston sticking are common causes.
Flushing and bleeding the clutch hydraulic system might not help ( or hurt) now but if not done regularly will cause the slave cylinder to have issues.
This is a hydraulic clutch system. Sounds like it time for a clutch master/slave cylinder rebuild. The clutch system is holding pressure on the clutch not allowing full release. Most likely the master is gummed up but you should rebuild both.
This is why you have no free play in lever.
The trapped pushrod on the master cylinder is an easy miss.
But, just for giggles, remove the slave cylinder and push the piston all the way back in, being aware that the filler cap needs to be off and dont let the reservoir overflow, then reinstall it and pump the lever until you have clutch release again and test ride...... MIGHT help....
Depending on the severity of the issue you may need a new slave cylinder. The one on my '03 started leaking as the fluid appeared to have been neglected before I purchased it. New fluid just leaked right past the deep pitting in the slave cylinder so I bought a new one. Deep pitting was revealed upon disassembly of the replaced leaking unit.