The HKS Upgraded Timing Belt for the Toyota 4A-GE / 4A-GZE (4-valve) engine is a strengthened replacement in belt size 113R. HKS Fine Tune belts use heat-resistant H-NBR grade tooth rubber and a strengthened construction that holds stable tension under heat expansion and high RPM, reducing cracking, stretch, and tooth skip versus an OEM belt. Designed for tuned, high-output engines and suited for use with the HKS Slide Cam-Pulley.
| Series | HKS Fine Tune |
| Type | Timing Belt |
| Engine | Toyota 4A-GE / 4A-GZE (4-valve) |
| Belt Size | 113R |
| Construction | Heat-resistant H-NBR; reinforced |
| Part Number | 24999-AT009 |
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