K157FMI 125cc Inlet & Exhaust Valve Pair
Brand-new unbranded replacement inlet and exhaust engine-valve pair for 125cc motorcycles using the K157FMI / K157FMI-GS air-cooled four-stroke engine family.
Valve Specifications
| Valve | Head Diameter | Stem Diameter | Overall Length | K157FMI Reference |
|---|---|---|---|---|
| Inlet / intake | 25.5 mm | 5 mm | Approx. 94 mm | K157FMI02-22A |
| Exhaust | 22.5 mm | 5 mm | Approx. 94 mm | K157FMI02-13A |
The K157FMI parts manual identifies one inlet and one exhaust valve in the camshaft/valve assembly. Independent K157FMI valve catalogues support the 25.5 mm inlet, 22.5 mm exhaust, 5 mm stem and approximately 94 mm overall lengths.
Verified K157FMI Motorcycle Applications
| Make | Models | Fitment Basis |
|---|---|---|
| Lexmoto | Adrenaline 125 / Adrenaline 125 EFI; Valiant 125 / Valiant 125 EFI; Lowride 125; Street 125 | K157FMI / K157FMI-GS engine or direct K157FMI valve catalogue application |
| Sinnis | Apache 125; Apache SMR 125; Blade 125; Bomber 125; Cafe 125; Max II 125; Retrostar 125; Scrambler 125; Stealth 125; Trackstar 125; Vista 125 | Official Sinnis K157FMI engine family and K157FMI valve-train parts |
| Keeway | Strike 125 | K157FMI engine-family parts; Keeway catalogue uses matching 129183090002 inlet and 129193090002 exhaust valves |
| Pulse | Adrenaline 125 | Direct K157FMI inlet-valve / valve-train compatibility catalogue |
| Superbyke | RMR 125; RSR125 | Direct K157FMI valve-train compatibility catalogue |
| Mash | Seventy Five 125 | Direct K157FMI valve-train compatibility catalogue |
| Mutt | Fat Sabbath; Mongrel 125 | Direct K157FMI valve-train compatibility catalogue |
| Direct Bikes | 125cc Enduro S E3; 125cc Hurricane E3 | Direct K157FMI valve-train compatibility catalogue |
| Dafier / SFM / UM / Zennco | DFE125-8A; Roadster / ZX125 / ZZ125; Scrambler Classic 125; Bullet | Direct K157FMI valve-train compatibility catalogue |
Important Fitment Information
This listing is intentionally dedicated to the K157FMI engine family. Do not order by 125cc capacity or motorcycle appearance alone.
Before ordering, confirm the engine code and compare the old valves with the dimensions above. Some visually similar engines such as SK157FMI-G, KW157FMI, QJ157FMI and other 156/157FMI variants can use different valves.
Keeway RKS/RKV/TX models use very similar 157FMI-2A/2B GS-derived engines and matching valve dimensions on certain versions, but they are not included in this K157FMI-only fitment table because the engine-code suffix differs. Keeway Strike 125 is retained because it is directly documented in the K157FMI parts family.
What's Included
- 1 x inlet / intake valve
- 1 x exhaust valve
Installation
Valve replacement requires correct valve-seat condition, valve-to-guide clearance, spring installation and valve-clearance adjustment. Cylinder-head inspection and installation by a competent motorcycle mechanic are recommended.