VETOR GROUP
1 / 1
The 25H*84L timing chain is a critical component for maintaining accurate crankshaft-camshaft alignment in small internal combustion engines. Its "25H" designation follows the universal 25H roller chain standard, with a 9.525mm (3/8 inch) pitch—ensuring compatibility with 25H-spec sprockets. The "84L" denotes an 84-link length, calibrated to match the timing system dimensions of compact engines (50–200cc).
25H standard pitch (9.525mm) and 84-link length ensure exact meshing with sprockets, eliminating timing drift and engine misfires.
Heat-treated (HRC 50–55) steel rollers and pins reduce abrasion, extending service life by 25% vs. non-treated chains.
Maintains flexibility and tensile strength in -20°C to 150°C operating temperatures, adapting to daily commuting or light-duty use.
84-link length directly matches factory specs for many 50–200cc scooters (e.g., Yamaha Jog, Honda Dio) and small engines, enabling tool-free replacement.
Fits 50–150cc 4-stroke scooters (e.g., Vespa Primavera 50, SYM Jet 14) as the core timing chain.
Used in 100–200cc underbones (e.g., Honda Wave 125).
Compatible with gasoline-powered equipment (portable generators, mini water pumps, lawnmowers) requiring 25H-spec timing.
Ideal for custom small-engine builds or replacement where 25H pitch and 84-link length are specified.
| Specification Item | Details |
|---|---|
| Chain Type | 25H Precision Timing Roller Chain |
| Pitch (P) | 9.525mm (3/8 inch) – Industry Standard 25H Pitch |
| Length (L) | 84 Links (Total Length: ~799.1mm, calculated as 84 × 9.525mm) |
| Construction Material | Heat-Treated High-Carbon Steel (1045) |
| Surface Treatment | Black Oxide / Zinc Plating (anti-rust & corrosion) |
| Minimum Tensile Strength | 1,700 N (382 lbs) |
| Operating Temperature Range | -20°C to 150°C (-4°F to 302°F) |
| Link Plate Thickness | 1.5mm |
| Roller Diameter | 6.35mm |
| Pin Diameter | 3.969mm |
| Compatibility | 25H-Spec Sprockets (10–18 teeth), 50–200cc 4-Stroke Engines |
"25H" refers to the universal 25H roller chain standard with a 9.525mm (3/8 inch) pitch, ensuring compatibility with 25H-spec sprockets. "84L" denotes the length of the chain, which consists of 84 links, providing a total length of approximately 799.1mm.
It is highly compatible with 50cc to 200cc 4-stroke engines. This includes small-displacement scooters (such as Yamaha Jog, Honda Dio, Vespa Primavera 50, SYM Jet 14), entry-level motorcycles (like Honda Wave 125), and gasoline-powered utility equipment like portable generators, mini water pumps, and lawnmowers.
The chain is constructed from heat-treated high-carbon steel (1045) with HRC 50–55 rated rollers and pins. This enhances wear and abrasion resistance, extending the overall service life of the chain by 25% compared to non-treated timing chains.
Yes, this timing chain is designed to maintain its flexibility and tensile strength within an operating temperature range of -20°C to 150°C (-4°F to 302°F), making it suitable for varying climates and daily light-duty operations.
The chain has a minimum tensile strength of 1,700 N (382 lbs). To protect against rust and corrosion, the surface is treated with a protective black oxide or zinc plating layer.
Since the 84-link length directly matches the factory OEM specifications of many standard 50–200cc engines, it acts as a direct replacement component and allows for a straightforward installation process without requiring customized modifications.
