DALTON YAMAHA R SERIES HELIXES 50R42 Y50R42

Yamaha Radiused Helixes – R Series

The "R" (radius) series helixes for Yamaha from Dalton features a short duration initial angle, radiuses into what is mostly a straight angle helix (second angle). This style of cut is a favourite of some clutch tuning professionals and is quite effective at controlling initial over-rev while still maintaining the characteristics of a straight helix.

For Yamaha “R” helixes, the first number is the short-duration initial angle, “R” identifies the radiused transition, and the final number is the main finishing angle, e.g. (49 R 44).