I have required a 1985 benelli 654 inline 4 from a family member recently. Had done minor work, much as cleaning carburators, and fuel tank to get the motor running. Problem I have encountered is that the clutch is not engaging. The clutch handle feels nice and tight when pulling but with it fully depressed I am unable to switch out of neutral. I am not to familiar with this model or the clutch mechanics and cannot find any parts or diagrams on the internet to diagnose or repair. If anyone could be of any assistants would be greatly appreciated.