Tomandjo, it sounds like you have a chassis designed for a 2 stroke motor ( sprocket on the outside of the RH side). In order to fit a 4 stroke of any sort ( they ALL have the drive shaft on the LH side of the motor) , you will have to reposition the sprocket on the axle inside the bearing, and possibly modify the chassis in order to mount the motor. Its not hard , but you will need some skills to do it. If you dont want to tackle that exercise, it may be easier for you to find a 2 stroke Comer 60 as originally fitted. Whilst i believe the 4 stroke will be a more reliable /less risky motor, you have to decide if you can do the changes required to convert to a 4 stroke.
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