Injector leak?

Hi folks,

For a while now my alp appears to have a slight leak from one of its injectors at the cylinder end...

anyone had the same problem? i wondered if its just a matter of tightning something up or do i go for a replacment?

You can't tighten anything .It is probably the O rings .Time to send them off for a refurb ,not point in just doing one .I have a box full of injectors if you want one in the meantime .