Engine
Engine service intervals, in hours
An off-road engine is scheduled by operating hours, because that is the unit that tracks load. The same 15 hour oil change can be 200 km of tight woods or 900 km of desert, and the oil does not know the difference. Below is what the manufacturers publish, per platform and per model year, with the model-year splits that are real and the ones that are not.
KTM and Husqvarna 4-stroke enduro
EXC-F and FE, 250 through 501. Operating hours are the primary spec because these bikes ship with an hour meter. The kilometre column is the US-market equivalent, and the schedule is whichever-comes-first across the axes a row provides. Model years 2017 through 2023 are identical; 2024 is the only real cutoff.
| Item | 2023 and earlier | 2024 and later | Notes |
|---|---|---|---|
| Engine oil | 15 h / 750 km | 15 h / 1,000 km | First change at 1 h. JASO MA 10W-50 or 15W-50. Around 10 h if raced. The hours never moved, only the kilometre milestone. |
| Oil filter | 15 h / 750 km | 15 h / 1,000 km | Changed with the oil, every time. |
| Oil screen | 15 h / 750 km | 15 h / 1,000 km | Cleaned with the oil. |
| Valve clearance, 250 and 350 | 30 h / 1,500 km | 45 h / 3,000 km | First check at 1 h. The 45 h figure applies to the small bores only. |
| Valve clearance, 450 and 500 | 30 h / 1,500 km | 30 h | The big bores stay at 30 h in KTM's factory service times. An unknown displacement resolves here, which is the conservative answer. |
| Air filter | 15 h | 15 h | Clean far more often in mud and dust. See the note below: two primary manuals say 30 h, and the app ships the shorter figure deliberately. |
| Coolant | 24 mo | 24 mo | Motorex OAT. Explicit in the 2024 matrix. Applied to earlier bikes as a conservative generalisation, since the US manuals for those cited about 4 years. |
| Brake fluid | 12 mo | 90 h / 24 mo | DOT 4, front, rear and clutch. The 2024 figure is the manual's. The annual figure for earlier bikes is a conservative convention, not a published KTM schedule. |
KTM and Husqvarna 2-stroke enduro
EXC 250 and 300, TE 250i and 300i, TPI through TBI. These rows are hours only: there is no kilometre column anywhere in the schedule. There is also no engine oil clock and no valve clearance, because a 2-stroke has neither. Its hard-service item is the top end, and its gearbox has its own separate transmission oil. Model year 2024, the TPI to TBI change, moves nearly every figure.
| Item | 2023 and earlier | 2024 and later | Notes |
|---|---|---|---|
| Transmission oil | 40 h | 45 h / 24 mo | About 0.80 L of roughly 15W-50. First change at 5 h on the older schedule, at 1 h from 2024, then again at 90 h. |
| Top end, piston | 80 h | 45 h | 40 h if raced and 10 h in sand on the older schedule. From 2024 it folds into the engine service at 45 and 90 h. |
| Piston rings | 80 h | 45 h | Replaced with the top end, never on their own clock. |
| Power valve | 40 h | 45 h | Checked with the piston. 10 h if raced on the older schedule. |
| Spark plug | 40 h | 45 h | Plug and connector together. NGK ZGR 7 G1, 1.3 mm gap on the older schedule. |
| Air filter | 20 h | 15 h | 10 h racing on the older schedule. Dust and mud override any of this. |
| Coolant | 48 mo | 24 mo | The TPI manual does specify 48 months. About 1.2 L from 2024. |
One thing worth stating plainly, because it gets repeated wrongly: these enduro bikes use oil injection with a separate 2-stroke oil tank and pump, not premix. The premix assumption belongs to the SX and XC motocross bikes, not to the EXC and XC-W enduro line.
Honda CRF300L and CRF300 Rally
A dual-sport is a different animal, and its schedule shows it: kilometres and months, no hours row at all, and intervals an order of magnitude longer than a race enduro's. One band covers 2021 onward. Do not read the KTM numbers across to this bike, and do not read these across to a race enduro.
| Item | Interval | Notes |
|---|---|---|
| Engine oil | 12,000 km | First change at 1,000 km. GN4 10W-30, JASO MA, 1.4 to 1.5 L. The annual oil change many shops add is a convention, not part of Honda's table. |
| Oil filter | 24,000 km | Every other oil change. |
| Valve clearance | 24,000 km | Intake 0.16 mm, exhaust 0.27 mm, both cold. |
| Air filter | 18,000 km | Replace, do not clean. Sooner in dust or wet. |
| Spark plug | 24,000 km | Inspect at 24,000 km, replace at 48,000 km. NGK SIMR8A9, 0.8 to 0.9 mm gap. The app nudges at the inspection figure, which is the conservative one. |
| Coolant | 36 mo | Pro Honda HP mixed 1:1. Around 0.77 L on a drain. |
| Brake fluid | 24 mo | DOT 3 or 4, sealed system. |
Conditions beat the table, every time. Sand, mud, dust, water crossings and racing all shorten these intervals, and the manuals say so themselves: 10 h in sand for a 2-stroke top end against 80 h normal is not a rounding difference. Clean an air filter whenever it is dirty rather than whenever a counter says so. Your own owner's manual is the authority for your bike, your model year and your displacement.
Where these numbers are softer than they look
Four figures above are not straight manufacturer values, and the app's own interval sign-off record names them rather than hiding them:
- 4-stroke air filter, 15 h. The 2024 manual gives 15 h, but two primary KTM manuals schedule airbox cleaning at 30 h. The app ships 15 h because it is the shorter and therefore safer of the two, not because the 30 h figure is wrong.
- 4-stroke coolant, 24 months on pre-2024 bikes. 24 months is explicit in the 2024 matrix. Earlier US manuals cited about 4 years from a single source, so the shorter figure is applied across the board.
- 4-stroke brake fluid, 12 months on pre-2024 bikes. An annual convention traced to an aggregator rather than an OEM manual. The 2024 manual moved to 90 h or 24 months.
- The Honda annual oil change. Honda's table has no 12 month oil row. It is a shop convention, and the app does not schedule from it.
What this dataset deliberately does not cover
There are no rows for motocross-only 4-stroke and 2-stroke families, meaning the Honda CRF-R and Yamaha YZ race bikes. Independent verification against Honda's and Yamaha's own manuals found the sourcing for those platforms unreliable, with several figures that did not exist in any published schedule. Rather than encode a plausible-looking guess, those parts fall through to a neutral no-status state in the app: no interval, no due date, no false comfort. Enter your own interval from your manual and the app tracks that.
The same rule covers the parts with no shippable interval anywhere: reed valves, silencer packing and motor grease are condition inspections without a sourced number, so the app does not invent a schedule for them.
Hours are the axis. Something has to count them.
Every schedule above except the Honda is written in operating hours, which is a problem the moment you leave the engine: the hour meter on the bar counts the engine and nothing else, and it counts idling in the pits the same as a full-gas moto. Meanwhile the fork, the shock, the mousse and the gearbox all need their own hours.
Loam Moto counts moving time from the ride itself, runs an independent clock per component, and resolves your platform, model year and displacement to the exact row above. Both axes of a paired row run at once, so a 15 h or 1,000 km oil change comes due on whichever arrives first.
FAQ
How often should I change the oil on a 4-stroke enduro?
Every 15 operating hours, with the filter and the oil screen at the same time, paired with 750 km up to 2023 and 1,000 km from 2024, whichever comes first. First change at 1 hour, and roughly 10 hours if you race it.
When do 4-stroke valve clearances need checking?
Every 30 hours or 1,500 km up to model year 2023, all displacements. From 2024 the 250 and 350 move to 45 hours or 3,000 km while the 450 and 500 stay at 30 hours. The longer interval is for the small bores only, so if the displacement is unknown, 30 hours is the answer to use.
How many hours does a 2-stroke top end last?
80 hours on the pre-2024 schedule, dropping to 40 hours raced and 10 hours in sand. From 2024 it folds into the 45 and 90 hour engine services, so 45 hours. Sand is the figure to respect: it is eight times shorter, not a little shorter.
Every clock, counted from the ride
Loam Moto resolves your platform, model year and displacement to the manufacturer's own schedule, then runs each part on its own hours and kilometres from the ride you just did. Any motorcycle or e-moto, petrol or electric. Your garage and your GPS tracks stay on your phone.
