Hey Dan, We ran both, The 2069 seems to give more aggressive overall power, especially down low, whilst the 2033 is smoother everywhere, but pulls so hard.

Now we have FINALLY got the clutch sorted we will need to do more testing to confirm the above results. When changing pipes we noticed we had to change the HSN more than a quarter of a turn in.

On one run I had the poor thing at 125Deg Celcius. These engines will just keep giving and giving. Ryan's Serpent was Monoing onto the front strait. Top speed down the back strait was... PHENOMONAL. Ryan had a grin from ear to ear. However it blew a plug after a few minutes and on pulldown I noticed pitting on the top of the piston and Head button. ( Hence my comment not to go past 110 Deg and or run an extra shim) The engine still flies at this temp.