Honda GB350 / GB350C (2024+) Maintenance Schedule and Service Intervals
This is the maintenance schedule and associated service intervals for the 2025 Honda GB350 and 2024 GB350C. The GB350 series, known in some markets as the H’ness CB350, is Honda’s retro-styled roadster motorcycle powered by an air-cooled 348cc single-cylinder engine. Both the GB350 and GB350C share the same mechanical basis, with differences primarily in styling details and minor ergonomics.
Models that share this mechanical platform include:
- Honda GB350: standard retro roadster
- Honda GB350C: retro variant featuring additional classic styling elements, two-piece saddle, and distinct colorways
- Honda H’ness CB350: regional variant (primarily India)
The engine delivers approximately 20 horsepower at 5,500 rpm and 21 pound-feet of torque at 3,000 rpm, paired with a conventional five-speed transmission. Suspension duties are handled by a telescopic fork up front and twin rear shock absorbers adjustable for preload. The braking system incorporates dual-channel ABS with disc brakes at both front and rear wheels, sized at 19-inch front and 18-inch rear, respectively.
Since its launch, the GB350 line has remained mechanically unchanged, ensuring that maintenance schedules remain consistent across model variants and years. Maintenance procedures, intervals, and required inspections remain identical for both the GB350 and GB350C. Any changes to styling or minor components have not impacted service or maintenance requirements.
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Honda GB350 / GB350C Service Intervals
The Honda GB350 / GB350C requires basic service every 4,000 miles / 6,000 km or every 6 months, whichever comes first. At these intervals, the service includes:
- Oil and filter change
- Inspection and adjustment of the drive chain
- Brake system check (fluid levels, pads, and operation)
- Clutch operation check and adjustment if necessary
- General safety inspection of lights, indicators, and horn
Thankfully, the single-cylinder, air-cooled 348cc engine has straightforward accessibility, making this task simpler compared to multi-cylinder engines. Ensure to perform these services as scheduled, or more frequently if the motorcycle is used in harsh or dusty conditions.
Parts needed to service the Honda GB350 / GB350C
Servicing your Honda GB350 / GB350C is something you’ll have to do often, but it’s also easy. Here’s a list of the parts you’ll need for basic maintenance.
| Part | Honda GB350 / GB350C spec |
|---|---|
| Oil | Honda 5W-30 or 10W-30 oil, API SJ or higher, or JASO standard MA. Do not use “energy conserving” or “resource conserving” oils. The manual suggests Pro Honda GN4 10W-30 engine oil. |
| Oil filter | The Honda CB350’s standard oil filter is part number 15412-K0N-D01. This fits a number of India-only motorcycles. |
| Chain lube | Use Motul chain paste for mess-free chain lubrication. |
| Spark plug | Use an NGK MR6K-9 spark plug |
| Brake fluid | Use Honda DOT 4 brake fluid. |
| Cable lube | Use Protect all cable life cable lube |
| General lubrication | For general exterior parts lubrication use lithium soap-based grease. |
Maintenance Schedule for the Honda GB350 / GB350C
Below is the maintenance schedule for the Honda GB350 / GB350C. It’s based on the CB350 H’ness manual, which uses the same engine and components. The bikes are mechanically the same, just rebranded.
General Notes on Serviceability of the Honda GB350 / GB350C
- The GB350 / GB350C features an air-cooled, single-cylinder 348cc engine, making maintenance straightforward due to easy access and fewer moving parts compared to multi-cylinder engines.
- Drive chain requires frequent checks and lubrication, especially if the motorcycle is ridden under harsh or dusty conditions, to maximize chain and sprocket lifespan.
- After the final listed service at 24,000 miles / 36,000 km, continue following the same maintenance pattern at regular intervals.
- Honda recommends having the steering bearings and wheels serviced by a qualified mechanic to ensure safety.
Legend
- I = Inspect
- C = Check
- R = Replace
- L = Lubricate
| x 1000 km | 1 | 6 | 12 | 18 | 24 | 30 | 36 | |
|---|---|---|---|---|---|---|---|---|
| x 1000 mi | 0.6 | 4 | 8 | 12 | 16 | 20 | 24 | |
| Months | 1 | 6 | 12 | 18 | 24 | 30 | 36 | Every |
| Engine oil (Pro Honda GN4 10W-30) | R | R | R | R | R | R | R | Year, R |
| Engine oil filter (15412-K0N-D01) | R | R | ||||||
| Air cleaner | R | R | ||||||
| Crankcase breather | C | C | C | C | C | C | ||
| Spark plug (MR6K-9) | R | R | R | |||||
| Valve clearance | I | I | I | I | I | I | ||
| Fuel line | I | I | I | |||||
| Throttle operation | I | I | I | Year, I | ||||
| Engine idle speed | I | I | I | Year, I | ||||
| Evaporative emission control system | I | |||||||
| Drive chain | 1000 km (600 mi): I, L | |||||||
| Drive chain slider | I | I | I | |||||
| Brake fluid | I | I | I | I | I | I | Year, I 2 years: R | |
| Brake pads wear | I | I | I | I | I | I | Year, I | |
| Brake system | I | I | I | Year, I | ||||
| Brake light switch | I | I | I | Year, I | ||||
| Headlight aim | I | I | I | Year, I | ||||
| Clutch system | I | I | I | I | I | I | Year, I | |
| Side stand | I | I | I | Year, I | ||||
| Suspension | I | I | I | Year, I | ||||
| Nuts, bolts, fasteners | I | I | I | Year, I | ||||
| Wheels/tires | I | I | I | Year, I | ||||
| Steering head bearings | I | I | I | Year, I |
Maintaining Your Chain on the Honda GB350 / GB350C
It’s important to keep the chain on your GB350 / GB350C well maintained, as with any chain-driven motorcycle. Especially since many of these bikes are ridden on roads with varying surface quality.
Use a good-quality chain lubricant, such as Motul chain paste, or a Motul chain care kit, which includes useful tools for cleaning and maintenance. Heavyweight gear oil is also an acceptable option.
Honda recommends you follow the following chain maintenance schedule:
| Chain maintenance item | Interval |
|---|---|
| Check drive chain lubrication condition, lubricating if necessary | 600 mi / 1000 km |
| Check drive chain slack, adjusting if necessary | 600 mi / 1000 km |
Notes:
- Perform these tasks (checking/adjusting slack, and checking/applying lubrication) more often riding in dusty or rainy conditions.
- Always lubricate the chain after washing the motorcycle.
Honda GB350 / GB350C Pre-ride checks
Honda recommends performing the following pre-ride checks daily, or before each ride if the bike isn’t used regularly. Most of these can be done as part of your usual start-up routine, but make a point of checking the oil level and brake pads regularly.
| Pre-ride checks |
|---|
| Fuel level |
| Throttle operation |
| Engine oil |
| Drive chain |
| Brake fluid |
| Brake pads wear |
| Lights/Horn |
| Engine stop switch |
| Clutch system |
| Side stand |
| Wheels/tires |
Tire sizes and pressures for the Honda GB350 / GB350C
The manual for the Honda GB350 / GB350C specifies the following tire sizes and pressures.
Stock, it comes with tubeless tires with the brand MRF Zapper in the front and MRF Nylogrip in the rear.
| Wheel | Tire size | Tire pressure |
|---|---|---|
| Front | 100/90-19M/C 57H | Driver only: 2.0 bar / 29 psi Driver + Passenger: 2.0 bar / 29 psi |
| Rear | 130/70-18M/C 63H | Driver only: 2.25 bar / 33 psi solo Driver + Passenger: 2.5 bar / 36 psi |
About the 2025 Honda GB350 / GB350C
Honda’s GB350 and GB350C are proof that simple can still be special. These retro-styled singles take their inspiration from the classic UJM era, with just the right touch of modern engineering to keep them relevant and road-ready. Originally launched as the CB350 H’ness in India, the GB350 came to Japan with a new badge and a slightly tweaked look. The GB350C, introduced later, adds even more vintage styling cues with a two-piece saddle and straight-through muffler.
At the heart of both bikes is the same 348cc air-cooled single, a long-stroke motor that makes 20 horsepower at 5,500 rpm and 30 Nm of torque at 3,000 rpm. It’s fuel-injected, Euro 4 compliant, and built for relaxed, real-world riding. The five-speed gearbox is geared low in first for crawling through traffic, with tall ratios in the higher gears to stretch out on the open road. The exhaust note is a deep, thumping single-cylinder rumble that perfectly suits the character of the bike.
Suspension is conventional but well sorted: telescopic forks up front and twin preload-adjustable shocks at the rear. The frame is a steel spine type with a cradle, and ergonomics are laid-back without being lazy. The seat height is 800 mm, and at 181 kg wet, the bike is easy to handle for most riders. A 15-litre tank gives more than 450 km of range, which makes this an excellent commuter or weekend rambler.
Tech features are subtle but present. LED lighting, ABS at both ends, and Honda Selectable Torque Control (traction control) all come standard. The dash mixes an analog speedometer with a basic LCD screen. No ride modes, no TFT, no distractions. Just the essentials.
The GB350C comes with a few thoughtful upgrades, including a more sculpted tank, unique paint options, and a more traditionally styled seat and tail. Mechanically, it’s identical to the standard GB350, so maintenance intervals and tasks are the same.
Oil and filter changes are required every 4,000 miles / 6,000 km. The air-cooled engine layout makes servicing simple, and many basic jobs can be done at home with a good set of tools.
The GB350 and GB350C aren’t built to impress on spec sheets. They’re built to be ridden, enjoyed, and trusted. For riders who appreciate character, economy, and timeless style, these Hondas deliver exactly that, without complication.
Manual for the Honda GB350 / GB350C
The maintenance schedule above is taken from the Honda CB350 H’ness manual, which uses the same engine and components as the GB350 and GB350C. All three models follow the same service intervals.
