1983 Yamaha YT175 / Tri-Moto 175 • Free STL

YT175 Porting Template

A free basic printable cylinder template for getting a little more performance out of a 1983 Yamaha YT175 cylinder. Higher performance maps will be avaliable soon. Check back periodically!

66mm to 66.5mm is available now. Larger sizes are coming soon.

How To Use It

  1. Pick the template that matches the cylinder bore size.
  2. Slip the template into the cylinder.
  3. Bolt it down using two cylinder head nuts and spacers.
  4. Trace the ports onto the cylinder.
  5. Port the cylinder to the traced lines.
It's recommend to use Dykem on the cylinder. Spray paint can be used, but the clean up processes is longer. After coating the cylinder, a scribe or pick to trace the template cleanly. Higher performance porting templates will be available for purchase as finished prints only, not as STL downloads.

Product Photos

YT175 porting template setup from the top and bottom of the cylinder.

YT175 porting template in cylinder
Template seated in the cylinder.
YT175 porting template viewed from cylinder bottom
Template viewed from the cylinder bottom.
Blaster Cylinder coated in Dykem Red for reference
Template viewed from the cylinder bottom.