handling by 
Gta-Sanandreas-Master

gtasa/data/handling.cfg
QUADBIKE	  400.0	    500.0	4.0	   0.0 0.05	-0.15 103 1.1 0.65 0.45	    5 170.0	30.0 4.0  R	P	12.0  0.58 0 30.0	1.0	 0.9   0.0	 0.14 -0.09	0.5	 0.0	    0.2	0.30  9000	    290300	    1700015	    1  1	12



gtasa/data/carcols.dat
quad, 0,3, 0,44, 2,3, 46,0, 11,14

get that mod car colors make your game more cool ;)
http://www.gtainside.com/en/sanandreas/mods/86342-car-colors-mod/