AMA Racing
 
                                                               
      2010 AMA Racing Stock Class Approved Motorcycles*                                                  
                                                                 
Manufacturer COBRA COBRA COBRA Manufacturer HONDA HONDA Manufacturer MetraKIT KAWASAKI KAWASAKI KAWASAKI Manufacturer KTM KTM KTM KTM KTM KTM KTM KTM Manufacturer POLINI POLINI POLINI Manufacturer SUZUKI SUZUKI Manufacturer Yamaha Yamaha Yamaha Yamaha
Model CX50JR CX50SR CX 65 Model CFR250R9 CFR450R9 Model MKX50 KX 85 KX 250F KX 450F Model 50 SX Mini 50 SX 65 SX 105 SX 150 SX 250 SX 250 SX-F 450 SX-F Model X1R X3R XP65R Model RM-Z250 RM-Z450 Model YZ85Y YZ250 YZ250FY YZ450FY
Model Year 2010 2010 2010 Model Year 2010 2010 Model Year 2010 2010 2010 2010 Model Year 2010 2010 2010 2010 2010 2010 2010 2010 Model Year 2010 2010 2010 Model Year 2010 2010 Model Year 2010 2010 2010 2010
Bore 39 mm 39 mm 43 mm Bore 76.8 mm 96 mm Bore 39.84 mm 48.5 mm 77.0 mm 96.0 mm Bore 39.5 mm 39.5 mm 45.0 mm 52.0 mm 56.0 mm 66.4 mm 76.0 mm 97.0 mm Bore 40.2 mm 40.2 mm 45 mm Bore 77.0 mm 96.0 mm Bore 47.5 mm 66.4 mm 77 mm 95 mm
Stroke 41.7 mm 41.7 mm 44.7 mm Stroke 53.8 mm 62.1 mm Stroke 40mm 45.8 mm 53.6 mm 62.1 mm Stroke 40.0 mm 40.0 mm 40.8 mm 48.95 mm 58.3 mm 72.0 mm 54.8 mm 60.8 mm Stroke 39.2 mm 39.3 mm 40.8 mm Stroke 53.6 mm 62.1 mm Stroke 47.8 mm 72.0mm 53.6 mm 63.4 mm
Displacement 49.8cc 49.8cc 64.86cc Displacement 249cc 449cc Displacement 49.86cc 84cc 249cc 449cc Displacement 49.0cc 49.0cc 64.85cc 104.9cc 143.6cc 249.3cc 249.6cc 449.3cc Displacement 49.9cc 49.85cc 64.9cc Displacement 249cc 449cc Displacement 84.7cc 249cc 250cc 449cc
Cylinder liner Nikasil Nikasil Nikasil Cylinder liner Nikasil Nikasil Cylinder liner Nikasil Electrofusion Chrome Chrome Cylinder liner Plated Plated Plated Plated Plated Plated Plated Plated Cylinder liner Nicasil Nicasil Nicasil Cylinder liner SCEM SCEM Cylinder liner Ceramic-comp Ceramic-comp Ceramic-comp Ceramic-comp
Carburetion Dell'Orto 14mm  Dell'Orto 19mm Mikuni 24 mm Carburetion PGM-FI, 50 mm throttle body PGM-FI, 50 mm throttle body Carburetion Dell' Orto 19 mm Keihin PWK28 Keihin FCR37 PFI w/Keihin 43 mm Throttle Body Carburetion Dell'Orto PHVA 12 XS Dell'Orto PHBG 19 BS Mikuni VM 24-505 Keihin PWK 28 Keihin PWK-S 38 AG Keihin PWK-S 36 AG Keihin MX FCR 39 Keihin FCR-MX 41 Carburetion Dell'Orto PHBG 14 Dell'Orto PHBG 19 Mikuni 24 Carburetion Keihin Fuel Injection Fuel Injection Carburetion Keihin® PWK 28 Keihin PWK38S Keihin FCR MX37 Keihin FI 44mm
Transmission Single Auto Single Auto Six Speed Sequential Transmission Close-Ratio 5-Speed Close-Ratio 5-Speed Transmission Auto 6-Speed 5-Speed 5-Speed Transmission Single auto Single Auto 6 Gears 6 Gears 6 Gears 5 Gears 6 Gears 4 Gears Transmission Automatic Automatic 6 Gears Transmission 5 Gears 5 Gears Transmission 6 Gears 5 Gears 5 Gears  
Front Suspension / Travel Marzocchi 32 mm Cobra 30 mm  Marzocchi 35 mm Front Suspension / Travel 47.0 mm Showa Cartridge Fork 48 mm KYB (AOS); 12.2" travel Front Suspension / Travel Paioli Inverted Full Adjustable 36 mm Cartridge Fork 47 mm Cartridge Fork 48 mm Kayaba AOS Front Suspension / Travel Marzocchi 32mm / 4.33 in. Marzocchi 32mm / 7.28 in. Marzocchi 35 mm WP USD 43 mm WP USD 48 mm WP USD 48 mm WP USD 48 mm WP USD 48 mm Front Suspension / Travel Paioli 33mm Paioli 33mm Marzocchi USD reg. 35 mm Front Suspension / Travel Upside-down telescopic fork Telescopic pneumatic/coil spring Front Suspension / Travel Inverted fork; fully adjustable /        10.8 in.  Speed-Sensitive System inverted fork; fully adjustable /            11.8 in. Speed-Sensitive System inverted fork; fully adjustable /              11.8 in. Speed-Sensitive System inverted fork; fully adjustable /      11.8 in.
Rear Suspension / Travel Ohlin's Piggyback Fox Piggyback Ohlin's Rear Suspension / Travel Pro-Link Show Single Shock; 12.4" travel Pro-Link KYB Single Shock; 12.6" travel Rear Suspension / Travel Ohlins Uni-Track w/adjustable Preload Uni-Track w/adjustable Preload Uni-Track w/adjustable Preload Rear Suspension / Travel WP mono shock /  6.73 in. WP mono shock / 7.28 in. WP mono shock WP mono shock PDS WP PDS shock absorber WP PDS shock absorber WP PDS shock absorber WP PDS shock absorber Rear Suspension / Travel Adj. Paioli Monoshock Adj. Paioli Monoshock Adj. Ohlins Monoshock Rear Suspension / Travel Swing arm type Link type, coil spring Rear Suspension / Travel Single shock; fully adjustable /     11.1 in.  Fully adjustable single shock / 12.4 in.  Fully adjustable single shock /    12 in. Single shock; fully adjustable /    12.3 in.
Wheelbase 36 in. 40.1 in. 44.9 in. Wheelbase 58.8 in. 58.7 in. Wheelbase 40-41 in 49.4 in. 57.87 in. 58.3 in. Wheelbase 35.6 in. 40.5 in. 44.76 in. 50.3 in. 57.5 in. 58.3 in. 58.1 in. 58.1 in. Wheelbase 34.25in. 40 in. 45 in. Wheelbase 58.1in 58.9in Wheelbase 49.5 in. 58.3 in. 57.8 in. 58.8 in.
Overall Length 52 in 55 in 63.5 in Overall Length   86.3 in Overall Length 57 in 71.7 in. 85.43 in. 86. in. Overall Length 51.0 in. 55.0 in. 64.0 in. 74.1 in. 84.0 in. 84.8 in. 84.0 in. 85.0 in. Overall Length 40 in. 46 in.