This past Saturday I drove from Columbus, OH to Chicago to pick up the "heart" of my Frankenbeemer project. The engine is from an '83 R100RT with 14k miles on it. I bought it on Ebay from a guy with 100% good feedback, so I'm not too worried about the engine being bad (oil was very clean and the engine turned over by turning the flywheel). I got the complete engine (incl. starter, alternator, distributor, carbs, boots, exhaust pipes and oil cooler) for $860...a great deal. I'll start on it right after Christmas and will have it going by Spring. I measured the width of the R100 engine vs. the R65. and there is about an inch difference per side. This engine has the Nikasil liners and appears to have the same pigtail connectors as my R65LS. I hope it's a plug-n-play set-up. I'm leaving the 3.56 gearset in the bike, so this thing will probably accelerate like a rocket. I'll keep you guys posted on the progress. BTW, has anyone ever grafted the front portion of R100 pipes (38mm) to the rear portion of the R65 pipes (35mm)? My plan is to have the two welded together and then have the pipes and crossover dechromed and coated satin black by Jethot Coating...I'll be able to keep the stock LS mufflers (which will make this bike a real sleeper...it will appear stock).