So i screwed up big time

#1
when i ventured into my first real big 4 stroke dirtbikes i bought a 1984 yamaha xt250. well it had real bad compression and smoked. and i figured rings and was right need new rings so i tore down the motor over the summer and am just now receiving my rings and just saw that i didnt mark the cam's when at tdc. is there a way to figure out what position the cam needs to be at tdc ?
 
#3
I dont know how dirtbike motors are but like jesse said, theres a dot on the crank gear, and a dot on the cam gear. Both of those simply get lined up. Hopefully your motor is the same.
 
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