Recmar Honda BF175-BF250 Alternator Belt 31638-ZY3-003 6PK745
REC31638-ZY3-003
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Honda BF175–BF250 Alternator Belt
6PK745 replacement for 31638-ZY3-003
Recmar aftermarket alternator belt for specified Honda V6 four-stroke outboards. The 6-rib belt replaces Honda 31638-ZY3-003 and also cross-references the corresponding Tohatsu service number.
Key Features
- Aftermarket replacement for Honda 31638-ZY3-003
- 6-rib poly-V profile identified as 6PK745
- For compatible BF175, BF200, BF225 and BF250 model variants listed below
- Tohatsu cross-reference available for Honda-platform applications
- Belt only; pulleys and tensioning components are not included
Technical Specs
| Part type | Alternator / accessory drive belt |
| Belt designation | 6PK745 |
| Rib count | 6 |
| Nominal belt length | 745 mm designation |
| Honda reference | 31638-ZY3-003 |
| Recmar / 4Boats SKU | REC31638-ZY3-003 |
| Supply type | Aftermarket replacement |
Compatibility / Fitment Guide
Verified variant groups for the Recmar cross-reference:
| Honda BF175 | BF175A3, A6, AK1, AK2, AK3 and BF175D applications specifying 31638-ZY3-003. |
| Honda BF200 | BF200A2, A3, A6, AK1, AK2, AK3 and BF200D applications specifying 31638-ZY3-003. |
| Honda BF225 | BF225A2, A3, A6, AK1, AK2, AK3 and BF225D applications specifying 31638-ZY3-003. |
| Honda BF250 | BF250D applications specifying 31638-ZY3-003. |
| Tohatsu | Honda-platform Tohatsu application only when the service parts catalogue specifies HZY331638003. |
| Do not use for | BF115D, BF135A or BF150A/D engines using 31638-ZY6-003 / 4PK810, or any variant listing a different belt. |
Serial-number check required: Honda reused horsepower names across generations. Confirm the exact suffix and serial range in the parts catalogue, then install and tension the belt to the model-specific workshop procedure.
Part Number Cross Reference
| Honda part number | 31638-ZY3-003 |
| Tohatsu part number | HZY331638003 |
| Belt profile reference | 6PK745 |
| Recmar / 4Boats SKU | REC31638-ZY3-003 |
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.
Does it fit every BF200 or BF225?
No. It fits only variants whose parts catalogue specifies 31638-ZY3-003. Check the full model suffix and serial number.
Can it replace the ZY6 belt?
No. 31638-ZY6-003 is a different 4PK810 belt for other model families.
Does the Tohatsu reference make it universal for Tohatsu outboards?
No. HZY331638003 applies only to the corresponding Honda-platform application. Verify the Tohatsu model and serial catalogue.
What is included?
One 6PK745 alternator belt only.
Confirm 31638-ZY3-003 or HZY331638003 in the exact engine parts catalogue before purchase.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
