Yamaha warrior problems

[Two-Fast Yfz 450]

I have a 2001 yamaha warrior i just replaced the stator and cleaned the carb and put a new starter on it but i cant get it to start all it does is spin the motor and it has very litttle spark

[SCRAMBLER]

Did you unplug any of the wiring when you did this?...I had a warrior and it started cutting out and back firing and about mid rpm would not rev any higher,I changed the spark plug about 3 times cleaned the carb 2 times it drove me crazy for 2 days trying to find the problem.Then I found out the whole electical system goes thru that 1 little wire at the reverse lever it bolts on by a little philips screw at the reverse lever bracket,there was the problem bad connection.