Bruno:

I use this flywheel:
http://www2.towerhobbies.com/cgi-bin...?&I=LXM759&P=7

Your flywheel is 39.88mm in diameter and mine is 40mm so I agree that the flywheel is not the problem. I also use that motor mount and it lines up perfect with the holes in the chassis. Maybe its a bad motor mount? I been using this motor mount for a long time and love it. It is fully adjustable, unlike the old motor, and can really help in the fine tuning of the spur mesh for better running.

Vectorlab:

No, I have not flipped the A-arms. The MT2 has a pretty good turning radius as is, but it is a good idea. The biggest thing I have been fighting on mine is the rear ends tendency to want to jump over tyhe front. It is the oddest thing, but the truck will hookup great, takeoff down the back stretch, then hit a little bump and wham the rear end is in the air. I think it is due to the huge weight tranfer that occurs during excelleration is compressing the springs to the max. Then I don't have enough movement left in the shock to take the bump. I have been able to control the vehicle, but am still looking for an answer. I have put heavier springs, lighter springs, heavier shock oil, lighter shock oil, 1 hole shock inserts, 2 hole shock inserts, aluminum shocks - but I am trying a new thing. I have the CF rear shock mount, so I laid the shocks down like the front ones, put the shock on the lowest hole possible. The front end works so good on this vehicle I finally figured I should emulate it on the back. I am running it tonight, I'll post an update