CUB 90 INTO A ST 70?

Hi to you all,i have a st 70 1976 ,question is will a cub 90 motor fit ,it is a 12volt cdi unit . I know electrics will have to be done ,anybody else done this?.
Best regards Ian I.O.W

hi ian, read the post " can anybody help please" i asked the same question not long ago lee

I cut my teeth on the 3-speed Honda semi-auto's in the 70'S (C50, C70, C90, ST70 etc) and I was always under the impression that while the 6V 50 & 70cc units were direct replacements, the 90cc unit was quite different and could not be simply slotted in.
The only reliable way to check would be to check all the dimensions of the two units.

The C90 engine can NOT be fit easily under a dax frame, it is a lot wider.
That's why this type of engine is know as the "fat harry" engine.