Hello John,

No problem about asking questions for your friend. You are absolutely spot on with your description of the adaptor. Glad to see he has a Sullivan starter, the RCV120SP engines are very high torque and need a good starter. I will assume it was the whole Starter adaptor that was flying out.......
With most starters there is a rubber cup, for use with the RCV Starter Adaptor this cup must be removed or, if you try and fit the starter into the cup alone it is likely to throw out in any direction! For this reason our instructions specifically advise the removel of this rubber cup which is quite an any easy operation....just remove the rubber cup out of the starter pulley, remove the nut behind it, then remove the starter pulley. Secure the Starter Adaptor with the two screws provided. Please ask you friend to ensure this operation is carried out, if not already done so. If he needs any further assistence on how to do this then please let me know and I will send you something direct.

I hope this information will help.
Have fun

Angela
RCV Engines - UK