Hi, I have an old JP black RS12 3 port engine thats no longer has compression, so I'm on the look out for a new set. I gather the JP FX T-03 Modified P/S/R set will fit but will the ports on the sleeve match up with the channels on the RS12's crankcase.
I mean how different is the inside of the RS12's crankcase compared to the new FX's.
The engine was really very fast b4 it lost comp and I would love to get it back to the way it was, any help would be much appreciated!

Cheers