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14 - 35
14-43
15-36
14-38 is the best sprocket combination, using an iridium spark plug or any upgrade of spark plug. it will surely deliver power and speed. and you don't need to open your engine for more upgrades.
engine sprocket =14t rear sprocket =35t
use 16/32 sprocket
Adjust the sprocket of the chain
12 counter sprocket 47 rear
It should be stamped on one of the sides, Or simply count it.
The way to adjust cam chain on TTR 125 is by putting the chain on the cam sprocket and making sure that it is the same. You can also remove and reset it as well.
Bad seal. Drain oil, take front sprocket off, pop old seal out, clean out making sure any dirt and grit is removed before installing new seal.