Table of Contents
OS SPEED 21VZ-B Spec II
This is the 2008-2009 Worlds Edition.
OS Speed 21VZ-B Spec II
Specifications
Crank Specifications
| Variant | |
|---|---|
| Crankshaft | Double Tungsten Slugged/DLC Coated/Silicone Fill |
| Crank Type | 14mm SG Style |
Crankcase Specifications
| Variant | |
|---|---|
| Rear Bearing | Ceramic 14.00 x 25.40 x 6.00 |
| Front Bearing | Steel 7.00 x 19.00 x 6.00 |
| Case | Cast Aluminum Black Oxide Coated |
| Backplate | Bump Start |
Rod Specifications
| Variant | |
|---|---|
| Rod | Knife edged Aluminum with brass bushing |
| Rod Length | 30mm |
Piston/Sleeve Specifications
| Variant | |
|---|---|
| Piston/Sleeve Type | ABC(Aluminum Piston, Brass sleeve, Chrome Liner) |
| Intake Ports | 3 |
| Exhaust Ports | 1 |
Carburetor Specifications
Carb Needle settings are default after breakin.
| Variant | |
|---|---|
| Carburetor | OS 21J |
| Carburetor Size | 7mm |
| Carburetor Style | Slide |
| Carburetor Material | Aluminum Body with Nylon insulator |
| Carburetor Adjustment | 3 Needle |
| Carburetor Restrictors | 6mm, 6.5mm, 7mm |
| Carb LSN | - |
| Carb MSN | - |
| Carb HSN | - |
Head Button/Cooling Head Specifications
| Variant | |
|---|---|
| Head Button | Turbo |
| Supplied Glow Plug | OS P3 |
| Cooling Head | Black Anodized Drilled Aluminium |
Timing Specs
| Intake Rotor Timing Opening | 15.5° ABDC |
| Intake Rotor Timing Closing | 74.5° ATDC |
| Intake Rotor Timing Duration | 239° |
| Transfer Timing Height | 3.5mm from BDC |
| Transfer Timing Duration | 114° |
| Exhaust Timing Height | 6.4mm from BDC |
| Exhaust Timing Duration | 114° |
TIMING DIAGRAM HERE
Performance
| Manufacturer Claimed Peak | 2.5ps @ 34,000 |
| X-Dyno Peak Power(HP) | 1.5 @ 26,000 |
| X-Dyno Peak Torque(oz-in) | 59.82 @ 25,000 |
| X-Dyno Peak RPM Measured | 42,750 |
Variants
| Variant | |
|---|---|
| OS Speed 21VZ-B V-Spec | Original, Magnesium cooling head, 21H Carb 320.5g/11.3oz, Part#13893 |
| OS Speed 21VZ-B V-Spec AL | Same as original, Aluminum cooling head, 361.8g/12.46oz, Part#13894 |
| OS Speed 21VZ-B SpecII | Same as original, Drilled Aluminum cooling head, 21J Carb 349g/12.32oz, Part#13811 |
| Protek 321B Samurai V2 | Same as Speed, Drilled Aluminum cooling head, 355g/12.52oz, Part#PTK-2500 |
| Ninja JX21 B01 | 5 port version of speed, OS 28XZ Case, no slugs in crank, Aluminum cooling head, 361.8g/12.46oz, Part#JX21B01 |
| Ninja JX21 B01A | Same as original JX, Drilled Aluminum cooling head, 374g/13.19oz, Part#JX21B01A |