How do i tighten the chain on my yamaha yz 125, 2003 model?
Look in your owners manual. Long travel suspension (depending on configuration of pivot and drive sprocket) requires the chain to be quite slack at rest, or else when the suspension is compressed, the chain will tighten up and cause damage to your machine. I have had to replace 3 broken countershafts on different TTR125s over the last 6 months, all just down to the owners setting the chain too tight. (for you TTR125 owners, the chain; when the machine is upright and suspension is unloaded, should just touch the rearmost part of the underside of the black plastic swingarm protector / guide, when lifted with a finger. Of course this is at the tightest point of the chain. Any tighter and you WILL break the countershaft at the kickstart idler end, and if you are really lucky, require new crankcases too, as the internal damage will ensure that no oil can be fed to the gear wheels under pressure).
