This vehicle is intended to replace the Quadbike, nothing else will probably work.
My only advice is ride it like you stole it, as you probably did.

I have included GGMMs and files for manual install.

Handling,starting from the top.
QUADBIKE      400.0 	300.0 	5.0 	0.0 	-0.1 	-0.0 	70 	0.85 	0.9 	0.49 	4 	200.0 	25.0 	3.0 	4 	P 	8.0 	0.50 	0 	35.0 	0.8 	0.10 	0.0 	0.22 	-0.10 	0.5 	0.0 	0.2 	0.50 	9000 	381300 	38C207 	1 	1 	12 	

!	QUADBIKE	0.14	0.04	0.14	0.08	48.0	43.0	0.88	0.60	1.0	0.1	45.0	-35.0	-0.007	1.0	0.5


IDE,
471,	quad,		quad,		quad, 		QUADBIKE, 	QUAD,	quad,	normal,	4,	0,	0,	-1,	0.45,	0.45,		-1


Carcols,
quad, 126,111, 0,127, 106,91, 127,13, 6,78, 86,65, 0,0

Enjoy it,
pinky.