Cmb .91 GPX

[Danny King]

Testing out another .91 option…

 

[ACTION JACKSON]

Wonder if the new piston & liner would work with the older 91rs red head

 

[RaceMechaniX]

Wonder if the new piston & liner would work with the older 91rs red head

No, see the other thread in the motor forum where Ian shows a picture of the 2-piece sleeve in the GPX. The RS3 sleeve and the 2022 GPX upgrade sleeve are likely backwards compatible with the last generation of red heads.

 

[Jeff Lutz]

Wonder if the new piston & liner would work with the older 91rs red head

It will not. It is smaller. Danny actually gave me the sleeve OD of 1.260 on the new .91 GPX. The old Rs 91/101 was around 1.300” . I completely understand you asking that question though. Hobby Miracle has the RS 101 redhead sleeves that will fit your old Redhead (Not sure about .91’s). The newer RS Evo 91/101, GPX 2022, .91 Mline, new RS3 sleeve are all around 1.323”.