JASO FB
Overview
JASO FB oils are defined primarily for high lubricity performance without any low-smoke and exhaust system blocking technology. They are designed for use in two-stroke motorcycles and small engine equipment.
The main physical, chemical and engine test requirements, according to the current version of the standard (JASO M345:2018), for JASO FB oils are shown below:
Physical and Chemical
| Requirement | Methods | Unit | Limit |
| Kinematic Viscosity (100°C) | D445/K 2283 | mm2/s | 6.5 min. |
| Flash Point | D92 or D93/K 2265 | °C | 70 min. |
| Density (15°C) | D1298/K 2249 | g/cm3 | Report |
| Pour Point | D97/K 2269 | °C | Report |
| Colour (visual inspection) | D1500 | Report | |
| Sulphated Ash | D874/K 2272 | % mass | 0.25 max. |
| Phosphorus | D4951/JPI-5S-38-92 | % mass | Report |
| Nitrogen | D4629/K 2609-1990 | % mass | Report |
| Sulphur | D2662/K 2541-1992 | % mass | Report |
Engine Testing (JASO FB)
| Evaluation Item | Test Method |
JASO FB Standard Index |
| Honda Lubricity (LIX) | JASO M 340 | 103 min. |
| Initial Torque (TIX) | JASO M 340 | 98 min. |
| Honda Detergency (1 hour) DIX | JASO M 341 | 65 min. |
| Suzuki Smoke (SIX) | JASO M 342 | 45 min. |
| Suzuki Blocking (BIX) | JASO M 343 | 45 min. |
The significance of the index numbers:
The numbers for each evaluated item, i.e., Lubricity, Initial Torque, Detergency, Smoke and Blocking are all index numbers which are associated with performance in each category. Basically, the higher the number, the better the performance in that category.
For more information on JASO FB, contact your Lubrizol representative,