Is this enough or should I get a heasgasket with a 89mm bore?

 

Looks fine to me what brand Head gasket and what bore are you running? OEM headgasket are typically 1mm larger than the bore. As long as the HG is at least the same bore as the cylinder then you should have not any problems.

Pirate

 

You're good. You still have some leeway between the cylinder and head gasket bore.

 

as long as the gasket isn't lapping into the cylinder where the piston could catch it you should be fine.