Chain legth for a 4" stretch

[fiend]

Chain length for a 4" stretch

Did a search and could only find first gen lengths, so my question is does anyone know if I will have to get a new 150 link chain and cut it down or will I have to get a 120 link?

 

[Pardini]

Might check here I think he has a calculator for chain length.

Gearing Commander: Motorcycle Gearing Ratio Sprocket RPM Speed Chain Calculator