The engines were running way out of sync before I tore them down and cleaned them. That was why I did that. I've swaped glow plugs and tried 2 new ones. I've been using tower cheapies. They've worked for me for many many years in the 2 strokers with no problems, so I dont want to hear about tower plugs being crap. You wont convince me. I've also tried mccoys (dont remember the number). Only tried OS plugs once about 10 years ago and didnt see any advantage to using them. Made no difference in engine performance. Cost didnt justify them and I can honestly say I've only burned out one tower plug in 10 years. All other suspected plug problems turned out to be something else. I cant say without a doubt, but I dont believe the engines have been run lean. I'm not exactly a novice at this. Both engines run great separately. They just dont seem to be a good pair now. My last resort was to adjust the linkage to see if I could get them closer. I am going to do that.
Edwin