I have my new Twist all together now and am working on balance. I moved the battery as far forward as I could but it's still tail heavy. I need about 6 oz in the nose. I mounted the Super Tigre .51 engine according to the manual with the face of the drive washer 4.25" from the firewall. There is room on the mount to position the engine farther forward. Is this an option or is the 4.25" dimension critical?

Any other ideas to shift the CG forward?

Thanks.