The chain tensoner is the part that is mounted on the back of the swing arm and connected to the engine just above the output shaft. If you tighten that up the back of the motor will swing up and the chain will tighten up. Sometimes the tube where the chain tensioner is mounted to will bend down loosening up the chain also.
The last thing can be chain stretch, these chains do strech after a while but usually adjusting the tensioner helps this.
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T.J.
Yerfdog Spiderbox, Uni Type air filter with 6" intake, 130 jet, Orange no-rev limit cdi, Red coil, iridium plug, 1500rpm clutch springs, 1500rpm contra spring, 13g sliders, 22" rears, 21" fronts, aftermarket reverse installed, and Trailtech Vapor.
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