that only broke after 100s of laps - maybe even close to 1000 laps of Archerfield track. It broke just after a VERY hard engine braking section of the track. 4 to 2nd decompression lock (backing in) into a corner. I'm stoked that motor is even still running.. For the record that motor is a 4st Lifan 125cc. 11.5hp at the wheels.