CMB 90 RS

[thomaselkins]

setting up a rigger and was wondering what head space was working well in the 90rs . It came with one shim installed but have others. Will be starting with a 1667 prop and a pipe set at 11.5 inches??????

 

[BigChuck]

If stock head and fuel at 50% 19-22 thou. Eveything else is money.

 

[steve wood]

open head volume to .8cc and set head clearance to .014, for power and low detonation. very important to check the rotor clearance, it should be .003 to .004, no more. if it checks out at .011 to .02x, it will never run right.