Geoffrey25

Ok stu thanks for that hopefully it will last for the better weather then it could mean engine out and on the bench job I am quite handy with spanners but have never done an out put shaft bearing before if its not too difficult I will give it a go thanks again joe.

Hi stu thanks for speedy reply pulling clutch in doesn't change sound did you mean con rod bearing or crankcase bearing I have never had a main bearing go ,but I have been told you can feel it through foot pegs and handle bars engine sounds good when stationary only really does it from 30 mph onwards many thanks joe.

Hi all I am new to this site this my first post so here we go ,I have had bikes on the road for over 30 years and had all manner of bikes I have just recently purchased a 2009 ybr125 with 17000 on the clock.This is my smaller bike I use through the winter months to save my 650 bandit any way the ybr is fairly clean and tidy looking it rides quit well all gears select well ,but there is a noise coming from what seems the left side of the engine when riding over 30 mph it sounds like rumbly front sprocket kind of noise.Now since hearing this noise I have changed chain and sprockets checked out the clutch checked valve clearance and cam chain tensioner at first I thought I had sorted it but the noise is still there,but it sounds good enough when on idle and when you rev it in neutral it just does it when riding.My question is I have never heard the engine of a ybr 125 before so I am not sure if there is a problem with it or they are just a noisey sounding bike , I have read that they can develop a common rumble sound just wondering if anyone has experienced any thing similar with their ybr many thanks joe.