Originally Posted by VenomWorldOrder
broke a conrod on my sirio the other day, what is the max temp (in celcius) you would feel comfortable running the motor at race temp? i am using runner time fuel and a sirio pipe on a mtx4 with standard gears amd 61mm type-ish diameter foam tyres.
around 120-130 deg. C They run hotter than Novarossi based motors and take a while to get up to race temperature.
Break in is critical with the Sirio motors. If you break them in too fast you are putting too much stress on the conrod. I followed the break in procedure on the Sirio website with great success. I also run a fuel with at least 11% oil content.