Murry, I would not think the sleeved cylinder made any difference. Just the luck of draw which seal went south. Are the seals new installed by you or a close friend? What did the plugs look like prior to the meltdown. If the seal in the mag side went down would you ask yourself the same question in ...

Rob, There are likely many cdi boxes that will work. I can tell you an Invader LTD has the same HSR retarding curve(27BTDC>8BTDC). The regular Invader has an advancing curve12BTDC>16BTDC. JD's HSR curve is identical to the LTDs. I have used a Polaris CDI box with 18 degrees of retard and it works ha...

Kieth, and others: I have read this thread and find it amazingly interesting. Good news, I have the Polaris (P) 400 (84) Cdi and installed it in my invader motor. Had to order a new stock coil and was waiting but the snow was flying. I also used the (P) flywheel, stator/ coils and CDI. At first I wa...