Valve Clearance Kept Changing

[Working_ZS]

Given your probable mileage from your stated usage, 54,600 kms or 33,900 miles, your valves and, or your valve seats in the cylinder head may be worn out. It could also be a problem with the lock nuts on the valve lash adjusters being unable to hold their torque due to worn threads.

If it were my bike, I would do an adjustment myself. Use a torque marker on the nuts to see if they move. If it doesn't hold and the nuts have moved, I would readjust and install new lock nuts. If it still doesn't hold and the lock nuts are staying tight, then I would look into replacing the cylinder head. Last time I looked they were going for US $150 shipped on AliExpress, probably cheaper to your location.

[ralphbalena]

Originally Posted by Working_ZS

Given your probable mileage from your stated usage, 54,600 kms or 33,900 miles, your valves and, or your valve seats in the cylinder head may be worn out. It could also be a problem with the lock nuts on the valve lash adjusters being unable to hold their torque due to worn threads.

If it were my bike, I would do an adjustment myself. Use a torque marker on the nuts to see if they move. If it doesn't hold and the nuts have moved, I would readjust and install new lock nuts. If it still doesn't hold and the lock nuts are staying tight, then I would look into replacing the cylinder head. Last time I looked they were going for US $150 shipped on AliExpress, probably cheaper to your location.

Well my total mileage for this bike is around 35,000kms.


I'll have to check with the mechanic on how he made the adjustment last time. and ask him why it kept on changing for only a show period of time.


might as well source a new head for this hehe

[Wild Dog]

Originally Posted by ralphbalena

Well my total mileage for this bike is around 35,000kms.


I'll have to check with the mechanic on how he made the adjustment last time. and ask him why it kept on changing for only a show period of time.


might as well source a new head for this hehe

You can get a new head, but at that mileage you should not need a new head.
Plus if the head came bad from the factory it would have had valve issues since day one or at least before the 10.000 km.
I know few Rx3 with over 50.000 km, that still have their original head.
The NC250 is reliable engine.