Service parts for the NL643
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air filter | 408620002 | Amazon $62.66 eBay $223.99 KuduParts $109.00 | ||
| Fuel filter | Fuel filter | 360720020 | Amazon $14.99 eBay $11.00 FridayParts $10.20 | ||
| Oil filter | Lube | LF3495 | Amazon $47.08 eBay $29.95 |
Common questions
What oil filter fits the Northern Lights NL643?
The Northern Lights NL643 uses oil filter part number LF3495.
Which fuel filter part number does the Northern Lights NL643 take?
The Northern Lights NL643 uses fuel filter part number 360720020.
What air filter does the Northern Lights NL643 use?
The Northern Lights NL643 uses air filter part number 408620002.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Battery Will Not Charge | Loose or corroded connections, Sulfated or worn out batteries, Loose or defective alternator belt | Clean and tighten battery connections, Check specific gravity of each battery, Check electrolyte level of each battery, Adjust belt tension, Replace belt |
| Engine Hard to Start or Will Not Start | Loose or corroded connections, Sulfated or worn out batteries, Loose or defective alternator belt | Clean and tighten loose battery and harness plug connection, Check specific gravity of each battery, Check electrolyte level of each battery, Adjust belt tension, Replace belt |
| Starter Inoperative | Check DC circuit breaker, Loose or corroded connections | If the breaker is tripped, reset it, Clean and tighten loose battery and harness plug connection |
| Starter Cranks Slowly | Low battery output, Crankcase oil too heavy | Battery is too small, Battery cables are too small, Check specific gravity of each battery, Check electrolyte level of each battery, Fill with oil of appropriate viscosity, Clean and tighten all battery connections |
| Entire Electrical System Does Not Function | Check DC circuit breaker, Faulty connection, Sulfated or worn out batteries, Improper starting procedure | If breaker is tripped, reset it, Clean and tighten battery and harness plug connections, Check specific gravity and electrolyte level of each battery, See starting section of this manual, Take special note of Bypass Switch operation |
| No fuel | Check level of fuel in fuel tank |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Northern Lights NL643 troubleshooting guide (16 entries) →
Parts
3| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 360720020 | Fuel filter | Fuel filter | Amazon $14.99 eBay $11.00 FridayParts $10.20 | |
| 408620002 | Air cleaner element | 1 | Air filter | Amazon $62.66 eBay $223.99 KuduParts $109.00 |
| LF3495 | Lube | 1 | Oil filter | Amazon $47.08 eBay $29.95 |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.