this is an email sent by JP for breaking in.

"Breaking procedure.
First time, 3 fuel tank on the bench with propeller with 5% of castor oil added inside the fuel normally used (25%). (Hudy tool is OK)
A good way is to use your filler (bottle used for refuel the car) and add inside 20cc of castor oil (it’s close to the volume of a 24x36 film box). Like that you make the quantity you need easily.
After that, you fix the engine on the car, and run with the same fuel ( castor oil added) and your engine riche. The temperature must be around 80°C to 85°C.
We use 2 fillers with the castor oil added in the fuel in a first time (1 liter in total). The third filler, when it’s come empty (half) we add fuel inside (no oil anymore), you do that 1 time again.
During this braking procedure you go with the engine really rich at first and step by step more lean. 80°c to 95°C
After that you can go with the normal fuel and step by step make a right adjustment of your engine. 110°C to 130°C
This breaking procedure is important now because the engines are more tight and the piston is more easy to damage with racing fuel during the critical time who is the breaking procedure.
I hope this information is able to help you in the breaking procedure of your JP Engine.

Best Regards,

J-Paul Calandreau"

Hope it helps you.

Have fun and you have made a great choice with JP engines