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For specs, Google CG125; they're the same for valve clearances.
For the chain on a new bike, I support the frame under the engine and remove the rear shock. I then place a scissor jack under the rear tire and raise it until the rear axle, swingarm pivot bolt and countershaft are all in a straight line. I then adjust the chain tension until it is just taut, without being tight. Since that is the point in the suspension travel where chain tension will be the tightest, I know that it will be looser elsewhere. Once the tension is locked down, I reinstall the rear shock and put the bike back on the ground. I then measure the slack at the mid-point of the chain and record it. Next time, you'll be able to simply check the tension with the bike on the side stand.
It's a lengthy process the first time, but you'll know that it isn't too tight when the suspension is compressed.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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