Need new cylinder metrakit or polini evo

[Connah]

Ive had stage6 modular cylinder, and a motoforce race one, Which the end bearing has fallen to pieces and fcked the cylinder and piston.
What cylinder to get? is the nikasil on the metrakit good? how long do piston rings last between evo II and prorace II, any better cylinders? around this price.

 

[SF2B]

Mina or Pia?

 

[Connah]

minarelli

 

[Connah]

ive bought the metrakit pro race, I have a stage6 pro exhaust and a roost sprint, Can anyone give me a recommened roller weight, I want more top speed, But i know the roost has no power till around 8000rpm