[SpudRider]

If you drop the engine for repairs, be sure to examine the O-ring which seals the intake manifold. Make sure this O-ring is not flattened, deformed, or torn, et cetera. Also, be sure this O-ring is installed when you tighten the intake manifold to the cylinder head.



This O-ring is a critical component which keeps dust from entering the cylinder head. Dust entering the cylinder head from either the intake manifold or air filter will eventually cause valve recession of the intake valves.

Once again, I recommend you keep your air filter well oiled, and clean. I use Belray Foam Air Filter Oil for the flat air filters in both my Zongshen motorcycles.

https://www.rockymountainatvmc.com/p...air+filter+oil