If you're an Aussie farmer or landowner tackling tough jobs in our harsh outback conditions—from dusty paddocks in the NT to rainy fields in Tassie—reliable equipment is a must. At Bullmax, we're committed to delivering the highest quality agricultural outdoor power tools, which is why we exclusively power our range with Honda's legendary GX series engines. These beasts are built tough for commercial-grade performance, offering unbeatable durability, fuel efficiency, and easy starting that stands up to Australia's extreme weather and rugged terrain. Whether it's our post drivers, earth augers, log splitters, or wood chippers, Honda GX engines ensure minimal downtime and maximum productivity, helping you get the job done right the first time.
Honda's GX lineup is a global favourite for good reason: they're engineered with precision for reliability, low emissions, and smooth operation, making them ideal for everything from handheld tools to heavy machinery.
Features like overhead valve (OHV) designs (in larger models), advanced ignition systems, and high compression ratios deliver up to 6% more power than predecessors, while keeping noise and vibrations low—perfect for long days on the farm.
They're also compliant with Australia's strict emissions standards, fuel-efficient to save on petrol costs, and backed by a network of local service centres for peace of mind.
By choosing Honda GX, Bullmax ensures our products are not just tough, but built to last in the Aussie bush.
Below, we dive into the specifics of the GX35, GX50, GX200, GX270, and GX390 engines used in our lineup. We'll cover their key properties, why they're so popular Down Under, and essential maintenance tips to keep them running like new. Always consult your Honda manual for detailed instructions, and remember, regular upkeep prevents costly repairs.
Honda GX35: Lightweight Power for Handheld Precision
Bullmax Applications: This compact engine drives some of our earth augers and post drivers, like the BMPD-H35-2 4 Stroke Post Driver, making it easy to handle fencing or drilling in tight spots without fatigue.
Why It's Popular and Key Properties: The GX35 is Honda's most powerful mini four-stroke for handheld tools, with a 35.8cc displacement, 1.3 net HP (1.0 kW) at 7,000 rpm, and 1.2 ft-lb (1.6 Nm) torque at 5,500 rpm.
Weighing just 7.6 lbs (3.3 kg dry), it's incredibly lightweight with a high power-to-weight ratio, replacing noisier two-strokes while halving operating costs through superior fuel efficiency.
Its world-first 360° inclinable design allows operation at any angle—ideal for awkward Aussie terrains—paired with an overhead cam (OHC) setup, oil-immersed timing belt, and low-vibration components for smooth, quiet running.
Aussies love it for its reliability in dusty, hot conditions, easy starting, and low emissions, reducing environmental impact on farms.
Maintenance Tips:
· Oil: 2.7 oz (80cc) capacity; use SAE 10W-30. Check before each use, change after first 10 hours, then every 50 hours or annually.
· Air Filter: Foam type; clean every 10 hours in dusty areas, replace if torn.
· Spark Plug: Inspect and clean every 100 hours; replace as needed (gap 0.028-0.031 in).
· Fuel System: Use fresh unleaded 86 octane+; drain carburetor if storing over a month to avoid clogs.
· General: Warm up for 30-60 seconds; store upright and dry. Easy access to components makes DIY maintenance a breeze.
Honda GX50: Versatile Mini for Tough Handheld Jobs
Bullmax Applications: Powers our augers, post drivers, and post lifters, such as the BMPD-H80-2 Heavy Duty Post Driver, delivering extra punch for larger posts in hard Aussie soil.
Why It's Popular and Key Properties: With 47.9cc displacement, 2.0 net HP (1.47 kW) at 7,000 rpm, and 1.6 lb-ft (2.2 Nm) torque at 5,000 rpm, the GX50 offers robust power in a lightweight 9.1 lb (4.1 kg) package.
It shares the 360° "any-side-up" tech for flexible use, plus a rotary-slinger lubrication system and precision valves for maximized output and minimal vibration.
Popular as a two-stroke alternative, it cuts fuel costs by half, runs quietly with a multi-chamber exhaust, and starts effortlessly thanks to exhaust decompression.
In Australia, its durability shines in agricultural and construction gear, handling heat and dust without skipping a beat.
Maintenance Tips:
· Oil: 4.4 oz (130cc); SAE 10W-30. Check daily, change every 50 hours.
· Air Filter: Dry paper; clean every 10-15 hours, replace annually in high-dust spots.
· Spark Plug: Easily accessible; check every 50 hours, replace at 100.
· Fuel System: Unleaded fuel; clean carb if performance dips, use stabilizer for storage.
· General: Inspect for scratches on the Bridge Guard; lubricate as needed. Simple design keeps it low-maintenance.
Honda GX200: Reliable Mid-Range Workhorse
Bullmax Applications: Fuels our log splitters, trenchers, and wood chippers, like the 30 Ton Hydraulic Log Splitter, for efficient land clearing and firewood prep.
Why It's Popular and Key Properties: 196cc displacement, 5.5 net HP (4.1 kW) at 3,600 rpm, and 9.1 lb-ft (12.4 Nm) torque at 2,500 rpm make this a versatile powerhouse.
OHV design ensures durability and fuel efficiency, with easy starting and low noise—key for rental fleets and pros
Aussies rate it for its high output in compact form (dry weight 35.3 lbs/16 kg), handling everything from pumps to generators in remote areas.
Maintenance Tips:
· Oil: 0.63 qt (0.6L); change every 100 hours or seasonally.
· Air Filter: Dual-element; clean foam every 25 hours, replace paper yearly.
· Spark Plug: Inspect every 100 hours; replace if fouled.
· Fuel System: Clean filter monthly; avoid ethanol blends.
· General: Check valves at 300 hours; store with full tank and stabilizer.
Honda GX270: Mid-Size Muscle for Heavy Duties
Bullmax Applications: Drives our heavy-duty log splitters, providing the grunt needed for splitting large Aussie hardwoods like ironbark.
Why It's Popular and Key Properties: 270cc, 8.5 net HP (6.3 kW) at 3,600 rpm, and 14.1 lb-ft (19.1 Nm) torque at 2,500 rpm, with a 2010 redesign boosting power by 6%.
OHV and advanced CDI ignition make it reliable for multi-purpose uses, like two-wheel tractors, with low emissions and quiet operation.
Popular in Oz for its rental-ready toughness and fuel savings in demanding ag work.
Maintenance Tips:
· Oil: 1.16 qt (1.1L); change every 100 hours.
· Air Filter: Clean every 50 hours; replace in dusty conditions.
· Spark Plug: Replace every 200 hours.
· Fuel System: Inspect lines; clean carb for smooth idling.
Bullmax Applications: Powers our commercial-grade wood chippers, shredding branches and debris with ease on large properties.
Why It's Popular and Key Properties: 389cc, 11.7 net HP (8.7 kW) at 3,600 rpm, and 19.5 lb-ft (26.5 Nm) torque at 2,500 rpm, in a durable 68.3 lb (31 kg) frame.
OHV with high compression delivers beastly performance for industrial kit, starting easily and running efficiently.
Aussies swear by it for non-ethanol reliability and low maintenance in harsh environments.
Maintenance Tips:
· Oil: 1.16 qt (1.1L); change every 100 hours.
· Air Filter: Dual-element; service frequently in bushfire-prone areas.
· Spark Plug: Check every 100 hours.
· Fuel System: Clean sediment cup; use fresh fuel.
· General: Valve adjustments at 300 hours; built for longevity.
With Honda GX engines at the heart of our tools, Bullmax guarantees top-shelf quality for your Aussie adventures. Browse our range at www.bullmax.com.au or contact us for advice— we're here to keep you powered up!
· General: Annual tune-up; ideal for Australia's variable climates.
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