To fit 1100 cranchaft in a 1198 as Herman Jolink did for dragster races
the cranschaft mass must be remachined, because they collide with the timing lay schaft.
place 1.8mm shims under the cylinders (stocke difference= 71.5-67.9=3.6 & 3.6/2=1.8mm)
you have to supply the1100 right primary cranckshaft gear (conical bore) to fit on the 1100 crankschaft
your main problem will be to fit the throttle bodies in place , because of the 1.6mm undercylinders spacers , the distance between the 2 trottle bodies will need to be increase. so they won't fit in your airbox anymore.
I'm working on this engine project to...with a X diavel (1260) crankschaft
You have to know thet the 1260 crankschaft has the same stroke as the 1100 ,
No collision between this crankschaft mass and the timing lay schaft
but the the grooved primary gear as the 1198... but on this engine the LH timing lay gear on the crankschaft has a
bigger bore and much more teeth. that's means you have to supply a 1198 one , rebore it , and the remachine the groove.
on the 1260 connectings rods are much more longer than on the 1198 (126.1mm instead of 122.5mm) and barrels (cylinders) are 5.1mm longer.
of course you can fit 122.5mm (1198) rods on this crankschaft, to obtain the same dimension that your solution with the 1100 crankschaft, the problem for the gear to remachine and the airbox fitting will remain...
perhaps the best way would be use 122.5mm conrod (the 1198/1200 ones) + to surface the top of your pistons , remachined the valves clearance.... and to rebalance the naw crankschaft (new piston weight). you will be aible to fit corectly the throttlebodies on the airbox.