Marshall1990

Hi, I'm currently having issues with my 1994 XJ900f. I've owned I for just under a year and a half now and it's served me well with little issues until about two months ago when the weather turned, since then everything has changed. Basically when I try to start the bike its just constantly turning over and refusing to fire up and occasionally making a wering noise as if the starter is just letting go of the engine and every now and then the oil light comes on and cuts everything off. Since I've owned it I have dropped it a couple of times but never done much more damage than breaking off the indicators, there was an issue when a fuse kept blowing for the headlights but I sorted that. What I have done to try and combat this I replace the battery but I'm going to also replace the spark plugs. However I fear this may not be enough because when I try to start it there is a clicking coming from what I can only assume to be the cdi unit, could this be shorting? Also the oil is slightly higher than it should be so I may need to drain and replace it, could this be cutting the engine out via the oil sensor? Ultimately electrical issues aren't my speciality especially considering this is the newest bike I've ever owned. I do know that after 20 years the engine is getting tired, the rings are beginning to stick and there's abit of smoking coming from the exhausts when i start her so a top end rebuild will be needed sooner rather than later. Any solutions anyone can throw at me please do, I've just about had enough and am about ready to strip off all the core electrical parts and replace them but I'd rather not if I can get decent advice. Thanks for reading and please help