I haven't used the bike much last year and when I took it out today the clutch will not release . The bike surges ahead even with the clutch lever pulled in . I checked my engine oil level and it seemed to be a little over the top mark on the dip stick so I drained off 1/2 guart . It is now on the lower mark but the clutch is the same . The clutch fluid sight glass is showing just above the low level mark . Could it be that I have air in the clutch hydraulic system ? I couldn't find any place to bleed the clutch . Thanks . Barry