What was the reason for you to replace the starter clutch?
3 things need to start a combustible engine. Spark, Air, & fuel.
Spark .. Check the spark plugs.
Air .. Make sure the air cleaner is not glogged
Fuel .. Check you fuel filter. Is it clogged? Is fuel making to the Carbs?
Check you battery and the connections associated with it. A bad connection somewhere and cause I bike to not start. Also, check the voltage on the battery.
No matter what you ride. Just ride!