kinroad 250 temp guage high

[lvflyer]

Hello - How can I tell if the temp is too high on my Kinroad 250?
It pegs past red and goeHello - How can I tell if the temp is too high on my Kinroad 250?
It pegs past red and goes done to JUST below read if I turn on the lights?
Also, where can a service manual for the Kinroad 250 - especially the engine and drivetrain system?
How do you adjust the chain and know how tight?

Thank-you