Print 2009 AMA Racing Stock Class Approved ATVs  
                                   
Manufacturer APEX APEX APEX COBRA COBRA DRR DRR DRR Manufacturer KTM KTM Pitster Pro Pitster Pro Pitster Pro Manufacturer    
Model Pro MXR 50 Pro MXR 70 Pro MXR 90 ECX50 ECX70 DRR/DRX50 DRR/DRX70 DRR/DRX90 Model 450 SX ATV 505 SX ATV FXR 90 FXR 125 FXR 150 Model    
Model Year 2009 2009 2009 2009 2009 2009 2009 2009 Model Year 2009 2009 2009 2009 2009 Model Year    
Bore 40 MM 47 MM 52 MM 39 MM 44.5 MM 40 MM 47 MM 52 MM Bore 97.0 MM 100.0 MM 46.0 MM 54.5 MM 60 MM Bore    
Stroke 39.2 MM 39.2 MM 42 MM 41.7 MM 41.7 MM 39.3 MM 39.3 MM 42 MM Stroke 60.8 MM 60.8 MM 45.5 MM 53 MM 53 MM Stroke    
Displacement 49.3 cc 68 cc 89.2 49.8 cc 69.5cc 49cc 68.2 89.2 Displacement 449.3cc 477.5cc 86 123.5cc 149.9cc Displacement    
Cylinder liner Steel Steel Steel Nikasil Nikasil Cast Iron Cast Iron Cast Iron Cylinder liner Plated Plated Alloy Alloy Alloy Cylinder liner    
Carburation Keihin PWK 19 MM Keihin PWK 21 MM Keihin PWK 24 MM CF Pedal 21 MM Mikuni 26 MM VM 21mm PWK 21mm PWK 24mm PWK Carburation Keihin FCR-MX 41 Keihin FCR-MX 41 22 MM 22 MM 26 MM Carburation    
Transmission CVT CVT CVT Single-auto Dual A-Arm w/SVO CVT CVT CVT Transmission 5 speed manual 5 speed manual 4 speed semi-auto 5 speed semi-auto 4 speed manual Transmission    
Front Suspension / Travel
Dual A-arms / 4 in.
Dual A-arms / 9.75 in.
Dual A-arms / 9.75 in.		 Dual A-Arm with SVOª / 9.76 in. Fox Piggyback Dual A-Arm / 4 in. Dual A-Arm 7.5+ in. Dual A-Arm 7.5+ in. Front Suspension / Travel WP fully adjustable; twin A-arms / 9.61 in. WP fully adjustable; twin A-arms / 9.61 in. Dual Control Arm / 9.8 in. Dual Control Arm / 9.8 in. Dual Control Arm / 9.8 in. Front Suspension / Travel    
Rear Suspension / Travel Swing Axle / 4 in. Swing Axle / 10 in. Swing Axle / 10 in. …hlins Piggyback / 7.87 in. Fox Piggyback / 8.66 in. DDR Works mono-shock DDR Works mono-shock DDR Works mono-shock Rear Suspension / Travel WP PDS mono-shock / 10.16 in. WP PDS mono-shock / 10.16 in. Long Travel w/GPX DNM Piggy Back Shock / 10 in. Long Travel w/GPX DNM Piggy Back Shock / 10 in. Long Travel w/GPX DNM Piggy Back Shock Rear Suspension / Travel    
Wheelbase 41 in. 42 in. 42 in. 42 in. 42 in. 39.5 39.5 39.5 Wheelbase 50.39 in. 50.39 in. 40 in. 41.25 in. 41.25 in. Wheelbase    
Overall Length 60 in. 60 in. 60 in.     58.5 58.5 60 in. Overall Length 71.25 in. 71.25 in. 60 in. 60 in. 60 in. Overall Length    
Track Width 41 in.     36 in. 36 in. 41 in. 41 in. 41 in. Track Width           Track Width    
Front Wheel size 10x5 in. 10x5 in. 10x5 in. 10x5 10x5 10x5.5 in. 10x5.5 in. 10x5.5 in. Front Wheel size 10.0 in. 10.0 in. 12 in. 12 in. 12 in. Front Wheel size    
Rear Wheel size 8x6 in. 8x6 in. 8x6 in. 8x6.5 8x6.5 7x7 in. 7x7 in. 8x7 in. Rear Wheel size 8 in. 8 in. 10 in. 10 in. 10 in. Rear Wheel size    
Seat Height 29 in. 29 in. 29 in. 26 26 25 25 25 Seat Height 31.3 in. 31.3 in. 27 in. 27 in. 27 in. Seat Height