KYMCO MXU 450i Service Specs: Part Numbers and Intervals
Michal B., KYMCO parts specialistThis is the service sheet for the KYMCO MXU 450i (4-stroke single, liquid cooled, 442.9 cc, fuel injected). It lists the battery, spark plug, filters, belt and the rest, each figure with the genuine KYMCO part number for the model years in our catalog (2017-2021, 2023-2024, 2026) and the diagram the part is drawn on. The figures are KYMCO service data from the KYMCO MXU / MAXXER 450i service manual (2012-2019). When this page and your own manual disagree, the manual wins.
What to know before you order
The MXU 450i uses a spin-on oil cartridge plus a strainer and takes 2.4 L of SAE 5W-30 when the filter is changed. Its front differential and rear drive take hypoid 80W-90, 270 ml and 250 ml, and are a four-year change. The battery is the YTX20L-BS, the same large battery as the 500 to 700 cc MXUs and the UXVs.
MXU 450i service specs at a glance
| Item | Spec | Genuine part number | Diagram |
|---|---|---|---|
|
Battery all models |
12 V 18 Ah |
31500-LDB5-E0A |
F11 Battery |
|
Spark plug all models |
gap 0.7-0.8 mm |
98059-57916-00 |
E03 Head Cover ● Cylinder Head Cylinder |
| Engine oil | SAE 5W-30; 2.2 L at an oil change, 2.4 L with the filter, 2.85 L dry | ||
|
Oil filter all models |
spin-on cartridge plus strainer |
1541A-PWB1-900 15420-PWB1-900 |
E01 Right Crank Case |
| Front differential and rear drive | SAE 80W-90 hypoid; 270 ml front, 250 ml rear | ||
| Tires | front 24 x 8-12, rear 24 x 10-12; 4 psi |
42710-LFA5-900 44710-LFA5-900 42710-LGN5-E0A 44710-LGN5-E0A |
F08 Rear Wheel |
MXU 450i maintenance intervals
Whichever comes first, distance or time. The first service is the one riders skip and the one that matters most on a new or rebuilt engine.
| Item | Interval |
|---|---|
| Engine oil and filter | at the first month or 100 mi, then every 3 months or 300 mi |
| Air filter | clean every month or 100 mi |
| Spark plug | replace at 4,000 mi or 18 months |
| Drive belt | inspect every 6 months or 500 mi |
| Coolant and brake fluid | replace every 2 years |
| Differential and rear drive oil | replace every 4 years |
Torque for the parts you replace
Clean, dry threads unless the row says otherwise. Aluminium cases strip long before a steel bolt complains, so use a torque wrench on the drain bolt and the plug.
| Fastener | N·m | ft-lb |
|---|---|---|
| Spark plug | 9.8-14 | 7.2-10 |
| Oil filter | 7.8-12 | 5.8-8.7 |
| Engine oil drain plug | 27 | 20 |
| Drive face (thread lock) | 115 | 85 |
| Driven pulley (thread lock) | 115 | 85 |
| Brake discs | 17-25 | 13-18 |
| Calipers | 24-32 | 18-24 |
Electrical test values
Measured at about 20 °C with the connector unplugged. A reading far outside the range points at the part; a reading inside it sends you back to the wiring and the connectors.
| Part | Test value | Genuine part number |
|---|---|---|
| Ignition coil | primary 0.55-0.75 Ω |
3051A-PRB8-900 |
| Stator | under 1 Ω yellow to yellow; about 220 W at 5,000 rpm |
31120-LFA5-E00 35107-PWB1-900 35108-PWB1-900 |
| Fuel injection | injector 10.6-15.9 Ω; fuel pump 300 ± 10 kPa (43.5 psi); throttle position sensor 3,500-6,500 Ω |
3920A-LKK7-E00 3920A-AEC7-E00 |
Every MXU 450i part, drawn on its factory diagram: KYMCO MXU 450i parts diagrams.
Which model year do I have?
The year decides which number is yours where a row lists more than one. Decode your VIN with the VIN lookup, or read the model code on the frame plate, then open that year's diagrams from the model list.