Check your coil, coil wire, plug cap, check for broken or grounding wires or bad connections. The CDI should be the last thing you replace. I think its even possible to test CDI units.
Try and find someone close to you that you can borrow parts off of, save the trouble of wasting money on not needed parts.
The stator should be the same, 81/82 and 83/84 R engines were the same except for the color.
-Nick
1988 Chevy Silverado 5.9L Cummins : 1986 ATC250R : 2012 Polaris RZR 570 :
98% of Americans say 'OH $#!T!!' before going into a ditch on an icy road. The other 2% are Alaskans, and they say 'Here, hold my beer and watch this!!'