Hi Maxam,
Yes thanks for your advice I have two other biela props 17x8 and 17x12 to try with this motor.
I went over the valve adjustment last night and will run the motor this evening to check the RPM with tacho.
I am still running 90/10 methanol/synthetic cool power blue mix. Not using nitro as I really want to avoid risking rust/corrosion having heard the reports of this on the 735 from posts on this thread.
If I am not satisfied with the performance I will give further consideration to converting to petrol using morris mini motor upgrade kit.