I have. DR177 and the barrel is going to be skimmed 1.5mm off the top. The Piston isn't much and I’ve been advised to use a Grand sport replacement. They cost £120 in the UK. Soooo could I use a Malossi or Polini one instead?
If it’s a bit shorter between the crown and Gudgeon pin, I can compensate by skimming the extra off the Barrel. Or can I?