I have completed about 50/80kms on my 21 after putting it back together and have 2 problems.Both of the port/chamber gaskets are leaking.I have TYGA pipes fitted and I made sure the surfaces were clean when I assembled them.Is this common or is there a trick to getting these to seal?Also the gear selector seal seems to be leaking.Are these easy to change?Your thoughts always appreciated.

Make sure the gaskets and manifolds are clean. Degrease everything.

A thin smear of sealant on the gaskets first should keep them quiet, and then a healthy smear on the manifolds before slipping the pipes on.

Leave about one hour before starting to allow the goo to go off.