HI, I haven't been on here in a while, so hope you guys are all doing well, I have been riding my 74 gt750 on and off for a while now, occasionally thrashing it

, I ended up racing a Harley, I know this is stupid but the guy kept on and on, I beat him off the line and pulled out ahead for a while then I guess his torque took over he started catching me, but then we had a stop light so technically I won!!!!

, then I felt very bad for raging on my old buffalo

, then I started worrying about all the stuff I could have done to the bike, so I got home and inspected stuff and I noticed a oil leak, which I had before but now after the race seems to leak more, anyway its from behind the counter shaft sprocket, I ordered the seal and I got a crap load of stuff, O-rings ,seals, etc.... so im wondering how difficult is it to replace this seal and O-rings and whatever else they sent me? im used to old Hondas that just have a seal (one seal) not multiple seals and O-rings? just wondering if this is a pain in the ass?