1991 fourtrax 300 2wd. HELP!

So I bought a bundle deal the other day from a guy and the 300 was basically in a box. Had a good motor and frame just had to put it all together. Got a few questions. One it has drum brakes up front. And the front right side locks up when rolling. Any reason as to why? And the second biggest question. I put the motor on the frame hooked up the harness. Had to purchase a new CDI and ICM arced the solenoid(have no key switch yet) and don’t have any spark. The coil is good I tested it on another quad. The kill switch is in the off position, any body know anything to check??? Thank you so much in advance

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