Hello just got a Yamaha sr 125 i think 1995 very noisey and top speed of 50 miles per h is that the normal top speed???

adjusted the valve clearances and cam chain and the sound its much better, i dont know how much does the chain tentioner need to be adjusted does it have a torke setting or a meassure on the cam chain???

regards

juan

They're said to be able to to a top speed of 55mph.

A timiong chaion tensioner is a spring loaded device with a ratchet mechanism that prevents it from being pushed back at all. or at least it should. It's normally held i place by two smaller bolts on the sides and a bugger cenrtral plug that can be opened and the springs taken out. Take out out and see if the ratchet mechanism is working as it should and make sure it locks properly when pushed out.