Cheers for that.
Is it (roughly) the same engine as the TRX/TDM? I know they have emulsion tube issues.
GC
They are roughly the same, the TRX a bit rougher.
I fitted a TDM850 motor to mine when I owned one, straight forward as I remember it, only had to strip and swap some carb linkages.
The TRX has a longer mainshaft so the chain will clear the wider back wheel.
All engines vary in firing 180*, 270*, model that changed in different years, etc.