There are two oil pumps in use in the 500s; the older 15100-415-000 and the newer 15100-MA1-000. The MA1 – as it’s Honda product code suggests – was introduced with the GL500 in 1981, and appears to have been used on other TI bikes introduced after that point. We have a writeup coming of the differences, but in the meantime here’s a short list:
<br/ >
Part | 415 | MA1 |
---|---|---|
O-ring between pickup and pump | 11.8×2.4 (16997-357-003) | 15×2.5 (91302-377-000) |
Oil strainer | 15141-415-000 | 15141-MA1-000 |
More to come…