Engine Cam Chain Tensioner Gasket – GT125 GV250 GT250 GV125
Maintain internal oil pressure and quieten your top end. This critical paper gasket must be replaced every single time you unbolt the timing chain tensioner. Swapping this flat seal guarantees correct hydraulic oil pressure feeds reach the internal adjuster mechanisms, immediately locking out dangerous timing slop or loose metallic chains.
- Function // Seals the high-pressure oil feed track directly behind the spring lifter body.
- Maintenance Must // Single-use crushed paper item—always drop in a fresh face to block side-case oil weeping.
- Options Available // Stocked in both early small-hole shapes and later model big-hole cylinder updates.
- What’s Included // Includes one (1x) individual paper composite chain tensioner gasket profile.
| BIG HOLE (Narrow Head) |
SMALL HOLE (Alien Head) |
Description
The Cam Chain Tensioner (CCT) gasket is a small but vital sealing component sitting at the back of your Hyosung V-Twin top-end cylinder walls. It maintains a secure link around the engine oil channels feeding right into the spring adjuster housing, keeping line pressure constant to prevent loose mechanical rattling from a slack cam chain. This compressed paper flat seal should be swapped out for a fresh sheet every single time the assembly is pulled for timing checks, manual adjustments, or seasonal top-end maintenance work.
💎 Stop Engine Rattles with the Right Seal
| Locks Hydraulic PressureMaintains crucial oil line feed thresholds to stop automatic plunger assemblies from slacking off under heat. | OEM Cross MatchAccurately trimmed port boundaries matching original part numbers 12837HP7600 and H31321. |
| Single-Use Sealing FaceCompresses down tight when initial bolts torque home—cannot map or flex onto older aluminum ridges if re-used. | Stops Side Case Oil WeepsKeeps the rear or front outer cylinder walls dry and free from sticky dirt oil mist rings. |
📜 Confirmed Fitment Guide
Confirmed Engine Matches: Fits air/oil-cooled V-Twin cylinder housings across these generations:
- GT125, GT125R, GT250, GT250R Comet: All model production lines running carburettors or electronic fuel injection between 2003 and 2022.
- GV125C & GV250 Aquila: Fits classic cruiser frame platforms manufactured between 1999 and 2018.
- Modern S-Platform Bobbers: Does NOT match modern liquid-cooled GV125S EFI or GV300S architectures, which use fresh overhead valve engines.
- 650cc Engine Lines: Does not fit larger GT650, GT650R, or GV650 cruiser engine blocks.
📸 Visual Guide: Which Gasket Do I Need?
Hyosung changed the timing adjuster housing layout around 2006 to handle larger bore cylinder refreshes. Sometimes earlier production chassis have had newer style assemblies fitted during warranty garage work. You must visually inspect your physical adjuster body before pacing an order to ensure a clean port line up:
BIG HOLE VERSIONSelect this if your machine uses a long, thin narrow-head tensioner unit. |
SMALL HOLE VERSIONSelect this if your machine uses a bulky flat-face alien-head style adjuster housing. |
If your engine is open for top-end timing services, check your cam chains for any damage, or replace them too. If you need cam chains, just browse the shop!
🔧 Install Tips
- Scrape the Faces Flat: Use a non-marring tool to scratch away stubborn green paper shreds or baked oil film from the cylinder port mount. Leftover ridge bits cause thin gaps that seep oil under load.
- Single Use Seating: This paper gasket template relies on structural compression to mold correctly onto your block lines. Never try to squeeze an already crushed or flattened sheet back down a second time.
- Align Oil Hole Ports: Double-check the gasket orientation shape before driving the mounting hex bolts home. The profile layout must orient correctly to keep oil flowing directly into the internal spring pressure cylinder channels.
Additional information
| Weight | 0.10 kg |
|---|---|
| Dimensions | 10 × 10 × 0.3 cm |
| Tensioner Gasket Size | Big Hole (Type B), Small Hole (Older Type A |
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