i bought a honda 300ex a while ago and i didnt get a service manual with it i was wondering if anyone has one and could just tell me how to adjust it. it is very loose.

 

Loosen the 2 allen head bolts on the rear of the axle carrier. Then use your hex key in one of the slots next to the sprocket. It is kind of like a cam. When you pull the hex toll toward you it puts tension on the chain. You want about 20 to 30 mm of movement on the chain. Hope this helps.

 

At the back of your swingarm are two allen head screws. Losen these. Beside your rear sprocket is a round thing with slots in it.(You'll know what it is) Insert your allen wrench in it and rotate it back towards yourself. When you have the desired tension retighten the allen screws.

 

thanks that was a big help.