Service specs
KYMCO AK 550 Service Specs: Part Numbers and Intervals
Battery, spark plug, oil, filters, belt and torque for the KYMCO AK 550: KYMCO service data with the genuine part number and diagram for each.
This is the service sheet for the KYMCO AK 550 (4-stroke DOHC parallel twin, liquid cooled, 550 cc, fuel injected, belt final drive). 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 (2021-2023, 2025-2026) and the diagram the part is drawn on. The figures are KYMCO service data from the KYMCO AK 550 service manual (2022, KYMCO USA). When this page and your own manual disagree, the manual wins.
- Engine4-stroke DOHC parallel twinliquid cooled, 550 cc, fuel injected, belt final drive
- Engine oil2.6 L at an oil change, 2.7...2.6 L at an oil change, 2.7 L with the filter, 3.0 L dry
- Spark plugCR7Egap 0.7-0.8 mm
- BatteryTTZ14S12 V 11 Ah sealed (the ABS needs a sealed battery)
What to know before you order
The AK 550 is a parallel twin, so it takes two NGK CR7E plugs, and it has a belt final drive in place of a chain. That puts two belts on the service list: the CVT drive belt, inspected every 5,000 km, and the toothed final drive belt, inspected every 5,000 km and replaced at 20,000 km. The ABS needs a sealed battery, and the factory one is the TTZ14S. Change the oil and the spin-on filter together, every 5,000 km.
AK 550 service specs at a glance
| Item | Spec | Genuine part number | Diagram |
|---|---|---|---|
| Batteryall models | 12 V 11 Ah sealed (the ABS needs a sealed battery); charge at 1.1 A for 5-10 h |  31500-LGC6-E01 |
 F11 Battery |
| Spark plugs (2)all models | gap 0.7-0.8 mm |  98059-57916-00 |
 E02 Cylinder Head Cover · Cylinder Head |
| Engine oil | 2.6 L at an oil change, 2.7 L with the filter, 3.0 L dry | ||
| Oil filterall models | spin-on filter plus strainer; replace the filter with every oil change, every 5,000 km (3,100 mi) |  1541A-LGC6-E00 |
 E01 Crank Case |
| Coolant | radiator 1,200 cc; radiator cap 0.9 kg/cm² (12.8 psi) | ||
| Air filterall models | replace every 5,000 km (3,100 mi); clean the CVT air filter every 5,000 km (3,100 mi) |  17211-LGC6-E00 |
 F14 Air Cleaner |
| CVT drive beltall models | inspect every 5,000 km (3,100 mi) (the schedule gives no replacement interval) |  23100-LGC6-E00 |
 E07 Transmission Pulley |
| Final drive beltall models | toothed belt; inspect every 5,000 km (3,100 mi), replace at 20,000 km (12,450 mi); tension 1,000-1,100 N with the engine off |
 23800-LGC6-E02 40530-LGC6-E00 23800-AKB8-E00 40530-AGJ5-E00 |
 F16 Rear Cushion |
| Brake padsall models | discs 4.5 mm front, 5 mm rear (new); brake fluid every 10,000 km (6,200 mi) |
 43105-LGC6-305 45105-LGC6-305 |
 F08 Rear Wheel |
| Tires | front 120/70-R15 56H, rear 160/60-R15 67H; front 2.35 kg/cm² (33.4 psi), rear 2.7 kg/cm² (38.4 psi) |
 42710-AKB8-E00 44710-AKB8-E00 42710-LGC6-305 42710-LGC6-E00 |
F08 Rear Wheel |
The diagrams behind this sheet
Each row of the table points at the factory drawing its part sits on. Open one to see the callout number, the quantity and the gaskets and bolts around it.
E01 Crank CaseOpen the diagram →
E02 Cylinder Head Cover · Cylinder HeadOpen the diagram →
E07 Transmission PulleyOpen the diagram →
F08 Rear WheelOpen the diagram →
F11 BatteryOpen the diagram →
F14 Air CleanerOpen the diagram →
F16 Rear CushionOpen the diagram →
F19 Wire HarnessOpen the diagram →
AK 550 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 | replace at 1,000 km (600 mi), then every 5,000 km (3,100 mi) |
| Oil filter | replace with every oil change: at 1,000 km (600 mi), then every 5,000 km (3,100 mi) (KYMCO's interval for the same 550 engine in the CV3 manual) |
| Air filter | replace every 5,000 km (3,100 mi) |
| Spark plugs | inspect at 10,000 km (6,200 mi), replace at 20,000 km (12,450 mi) |
| CVT drive belt | inspect every 5,000 km (3,100 mi) |
| Final drive belt | inspect every 5,000 km (3,100 mi), replace at 20,000 km (12,450 mi) |
| Valve clearance | check every 40,000 km (24,850 mi) |
| Brake fluid and coolant | replace every 10,000 km (6,200 mi) |
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 plugs | 9.8-14 | 7.2-10 |
| Oil drain magnetic screw | 25-31 | 19-23 |
| Oil strainer plug screw | 7.8-12 | 5.8-8.7 |
| Oil filter | 8-12 | 5.9-8.9 |
| Front CVT pulley nut | 75-91 | 55-67 |
| Driven pulley nut | 81-99 | 60-73 |
| Wet clutch nut | 59-72 | 43-53 |
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 |
|---|---|---|
| Crank position sensor | 96-144 Ω; ECU sensor supply 5 V | |
| Regulator rectifier | 14-15 V at 5,000 rpm |
 31600-LKF5-E00 31700-KEC8-E00 31600-ZXA6-M01 |
Every AK 550 part, drawn on its factory diagram: KYMCO AK 550 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.