Possible 1986. Model Number 1200726 ELPTO Serial number 0B104358
It has a cylinder selector on the back of the tacho 4,6,8 ?
what does the spin prob hub look like?
If it moved to 6000 rpm do you have a spun prop hub ?? As said above, the max rpm is 4500.
Kinna curious myself what are the part numbers?
If felt very slow and if that's the case why did the revs climb up to 6000rpm