Recmar Honda BF115D BF135A BF150A Alternator Belt 31638-ZY6-003
REC31638-ZY6-003
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Honda BF115D–BF150 Alternator Belt
4PK810 replacement for 31638-ZY6-003
Recmar aftermarket alternator belt for specified Honda four-stroke outboards. This 4-rib belt transfers crankshaft drive to the alternator and replaces Honda reference 31638-ZY6-003.
Key Features
- Aftermarket replacement for Honda 31638-ZY6-003
- 4-rib poly-V profile identified as 4PK810
- For compatible Honda 115–150 hp four-stroke outboards listed below
- Restores correct alternator drive when the original belt is worn or damaged
- Belt only; tensioner and pulleys are not included
Technical Specs
| Part type | Alternator / accessory drive belt |
| Belt designation | 4PK810 |
| Rib count | 4 |
| Nominal belt length | 810 mm designation |
| Honda reference | 31638-ZY6-003 |
| Recmar / 4Boats SKU | REC31638-ZY6-003 |
| Supply type | Aftermarket replacement |
Compatibility / Fitment Guide
Model-family coverage verified for this reference:
| Honda BF115 | BF115D variants using 31638-ZY6-003; verify full suffix and serial number. |
| Honda BF135 | BF135A family, including listed A4 / AK2 applications where the parts diagram specifies this belt. |
| Honda BF150 | BF150A and BF150D families using 31638-ZY6-003; verify variant suffix. |
| Not the correct belt for | BF175, BF200, BF225 and BF250 models that use the 31638-ZY3-003 / 6PK745 belt, or any engine listing another reference. |
Before ordering: read the existing belt marking where possible and confirm 31638-ZY6-003 in the Honda parts catalogue using model suffix and serial range. Check pulley condition and set belt tension to the workshop-manual specification.
Part Number Cross Reference
| Honda part number | 31638-ZY6-003 |
| Belt profile reference | 4PK810 |
| Recmar / 4Boats SKU | REC31638-ZY6-003 |
Reference numbers are used only to identify compatible applications. This product is an aftermarket replacement and is not supplied as a genuine engine-manufacturer part.
Frequently Asked Questions
Is this a genuine Honda belt?
No. It is a Recmar aftermarket replacement.
Will it fit a BF115A?
Do not assume fitment from horsepower. This listing is for engines whose catalogue specifies 31638-ZY6-003, principally the BF115D / BF135A / BF150A-D families.
Is it the same as 31638-ZY3-003?
No. ZY3 is a different 6PK745 belt used on larger model families.
What should be checked during replacement?
Inspect the belt for cracking, glazing and contamination, inspect pulleys and tensioner, then set tension according to the exact Honda workshop manual.
What is supplied?
One alternator belt only.
Confirm the complete Honda model suffix and serial number against 31638-ZY6-003 before purchase.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
