Thank you for your advice. It makes my repair much more affordable.
another little hint
foreword:
some 2 or 3 years ago my brother and me replaced, at a gen 1, the lower part of crankcase
only!
(the owner have had an accident and a piece of crankcase was irredeemably broken out)
but we had to messure (with plasti gauge) all crankshaft´s bearings and replace the "old" ones by 5 new pairs
(in this case thicker bearings)
by doing so we saved the lots of time to diassemble cylinder etc. (for replacing
both parts of crankcase)
result: this (our) very first "TEST"! was absolutely successful and the gen1 runs again like new.
according to "Boosted..." the dimensions of the two crankcase parts should be identical / the entire transmission of the gen2 should fit 1: 1 into the crankcase of the gen1
remember (so far i know) the gen2´s transmission shaft to front sprocket is a bit longer than the gen1´s shaft.
(take their both lenghts and you should be astonished)
so - if you don´t replace this shaft there is no chance to get the chain "straight lined" onto the front sprocket.
here my idea (
) :
if this replacement could also work fine,
if you put e.g. a lower gen1 crankcase to a gen2´s upper part ,
no one knows
and no one could guarantee.
and even if you do a replacement (like us) with now only gen2 parts, no one could guarantee a full success.
this try only wastes your time
but not a lot of money - i guess !