Hi Everyone,

Is there a way of increasing the secondary compression on a mc21? I'm having my crank inspected as it has suffered water damage (long story) and as the crank cases were empty was wondering if its possible to raise the secondary compression i.e. reduce the crank case volume to something closer to a NF5. I've seen loads of 2 stroke cranks with additional material (stuffers) added to them and started thinking, if the cranks apart and the the bearings need replacing then I wonder if I could add some nylon inserts around the big end area?

I'm also having a straight cut primary and secondary gear made which will hopefully make the right side bearing last longer.

Regards

Dave