I am feeling exhausted, this grinding noise issue has been years, replaced lots of parts but still cannot get if fixed.
The situation is, when I go at high speed (above 90km/h) for a while, there will be a grinding noise coming from the gear box, and it is in sync with the throttle. The noise will not stop until it comes to a very low speed (20km/h), and it will not come back until you go high speed again.
I have replaced,
-Variator with rollers and slide
Using torque wench to tighten them, so they cannot be too loose.
There sill be some minor grinding noise when turning the wheel by hand.
Both the nut at the engine shaft and wheel shaft was tightened too much, and the nut at the clutch was failed, noticed it when there is a gearing grinding noise when closing the throttle.
Could there be any other possible issue from the CVT side? Should I go check the gear box or flywheel side?
Any help is appreciated!