The problem you're most likely to have is the B110 A12 flywheel bolts have a different pitch to the B210/310 A12 & A14/15 bolts. Hopefully the bolts for the A15 are still there, if not you might have to scavenge them from another motor. The bolts should run in by hand easily. If they only go in a short way & tighten up, they are the wrong pitch. Don't be tempted to run them in with a rattle gun, as this will make the crank unusable, by damaging the threads. There is also an offset bolt hole, so the flywheel can only go on in one position. If only 4 of the 6 bolts start in, it's the wrong position. keep turning the flywheel til they all go in. Naturally the right position would have been the first one you'd have got if you turned the flywheel the other way.