Yamaha 225DX Specs and Review (Tri Moto 3 Wheeler)

Priding itself as the primary big-name ATV agency to go neck and neck with Honda, Yamaha was at it once more. However this time round, the Japanese producer didn’t create a racing mannequin to problem its long-time rival. It opted for a extra relaxed, much less intimidating machine with simply sufficient energy and grunt because it has methods up its sleeve – one thing that might attraction to thrill-seeking, aggro-recreational riders. So in 1983, it launched the Yamaha 225DX.

The Yamaha 225DX (a.ok.a. Yamaha YTM225 Tri Moto) was a sport-rec ATC that instigated using electrical starters and shaft drives in all-terrain automobiles. With a sturdy engine and a slew of industry-leading options, this iconic wheeler was extremely thought to be certainly one of Yamaha’s best creations.

Not solely was the Yamaha 225DX a forerunner of electric-start, shaft-driven ATVs, however it was additionally outfitted with a 4-stroke engine – breaking the norm of all-terrain car operation on all fronts. And though it was by no means meant to beat the racetracks, an increasing number of fans are not too long ago discovering how environment friendly it’s to experience on the dunes. In case you are intrigued by the historical past and capabilities of this iconic wheeler, then this information is for you.

ATV Tracks in Sand

Say Whats up to Comfort

After solely three years since launching the 1980 Tri-Moto YT125G, Yamaha launched the general public to one more first – the Yamaha 225DX. First launched in 1983, this three-wheeler takes satisfaction in being the world’s first ATC to supply an electrical begin system and shaft drive. Due to their degree of ingenuity, these options catapulted the 225DX into the limelight. And as if these weren’t sufficient, the trike additionally featured telescopic entrance forks and a mono-shock rear suspension.

The 225DX debuted within the ATV panorama alongside the 196-cc Yamahauler (YTM200EK) and Tri-Moto (YTM200K) fashions. It was produced just for three years – between 1983 and 1985. Regardless of its short-lived run, the machine succeeded in creating a long-lasting impression with the driving group. Functionally, it was Yamaha’s first-ever mass-produced leisure three-wheeler and its oblique response to Honda’s ATC250R.

Yamaha’s Tri Moto Sequence

Whereas not bearing the “Tri Moto” title, the Yamaha 225DX is certainly one of 5 iterations below the mentioned collection. In 1979, Yamaha first launched the 123-cc, 2-stroke Yamaha YT125G, progressively growing engine displacement with succeeding fashions. Enhancements have been made alongside the way in which to the machine’s transmission, bore-stroke ratio, and velocity/torque output (to call a number of). Apparently, the Tri Moto lineup started and ended with an air-cooled, 2-stroke engine – the final installment of the collection being the Yamaha YTM225DRS Tri Moto produced in 1986.

Solely 125-class variations of the Tri Moto have been launched between 1980 and 1983. It was not till 1982 that Yamaha launched the YT175J in a number of markets and completely in Japan’s Hokkaido area. 1983 appeared to be the busiest 12 months for the product lineup, with a number of machines, such because the YTM200 and YTM225 fashions, being marketed concurrently.

1984 Yamaha 225DX Specs & Options (YTM225DXL)


The Yamaha 225 DX makes use of an air-cooled, 4-stroke energy mill with an 8.8:1 compression ratio and a bore-stroke ratio of 70 x 58 mm (2.76 x 2.28 inches) – barely greater than the YTM200K Tri Moto.

Piston displacement is 223 cm3 (13.6 in3) delivered by a Mikuni VM22 (later modified to a VM24SS, in response to on-line sources). This carburetor was used throughout all 12 months fashions (YTM225DXK/L/N) with the identical #112.5 primary and #60 pilot air jetting and lends to a Yamaha 225DX high velocity of 40-60 mph (64.3-96.6 km/h, unofficial) and max torque of 16.5 Nm (1.69 kgf-m, 12.2 ft-lb) @ 5,500 RPM.

Gasoline & Lubrication

Like different Yamaha Tri Moto fashions, the 225DX has a moist sump (pump) lubrication system mated to a high-quality foam air filter. Gasoline tank quantity is 2.4 US gallons, however neither reserve capability nor Pump Octane Quantity is talked about within the service handbook.

The oil capability required is 1.5 L/1.6 US qt. (oil change) or 1.8 L/1.9 US qt. (engine overhaul) of SAE 20W-40 or its equal. In its place, the producer recommends same-viscosity motor oils with out molybdenum or graphite components. For temperatures beneath 40 °C/4 °F, use API-grade SJ+ SAE 10W-30 oils assembly JASO T903 MA requirements.


A 5-speed fixed mesh handbook transmission and an computerized, centrifugal-type multiple-disc clutch meeting ship energy to the wheels. A recirculating ball bearing steering system and remaining shaft drive deal with wheel spin. The shift sequence is all-up (N-1-2-3-4-5) and isn’t to be confused with the YTM225DR, which comes with a reverse gear.

This powertrain is revolutionary as a result of it was the primary within the ATV market to make the most of the shaft drive. In comparison with chain-driven wheelers, shaft-driven trikes require much less upkeep and operating prices. Common chain adjustment and lubrication aren’t a necessity, making the car simpler to scrub. Better of all, the shaft drive attracts out the total potential of the Yamaha 225DX carb.

Ignition & Lighting

It has a CDI (Capacitor Discharge Ignition) and an electrical begin system with recoil backup. A 12V 14Ah/(10 HR) GM14AZ-4A battery, alternator, and solid-state rectifier/regulator comprise its charging system. Ignition timing is non-adjustable and set to 10° BTDC @ 1,000 RPM (preliminary “F” mark) or 30° BTDC @ 6,000 RPM (full advance).

Spark plug requirement is just like the 1980 Tri Moto – an NGK DR7EA or ND X22ES-U spark plug with a 0.6-0.7 mm (0.024-0.028 inch) hole. The identical goes for idle velocity, which has stayed at 1,400 ± 50 RPM. Lighting specs embrace 45 W (headlight), 7.5 W (taillight), and three.4 W (impartial and reverse).

If worn or broken, you may change the inventory battery with both a YTX14AH-BS, YB12A-A, or YTX14AHL battery (view on Amazon) format. Ensure that to make use of a battery retainer must you buy an aftermarket battery with a barely decrease amperage than what’s advisable by the producer. Additionally, don’t exceed the particular battery gravity of 1.260 indicated within the handbook when charging.

Tires & Brakes

Inventory rubber consists of low-pressure tubeless 22 x 11-8 tires on all threes mounted on metal rims. Tire stress suggestions for entrance and rear wheels are 15 kPa (0.16 kgf/cm2, 2.2 psi) however will be aired down or inflated inside the vary of 15-69 kPa (0.12-0.70 kgf/cm2, 1.8-10 psi), relying on the kind of terrain. A entrance drum brake and enclosed rear discs full the machine’s tire-and-wheel meeting.

Changing inventory wheels to aluminum helps take the burden off the Yamaha 225DX, making it a tad lighter. Exchange punctured tires with same-size Cheng Shin C829 Knobby Tires (view on Amazon) – excellent for traversing extra technical trails. As for the general well being of your tire-and-wheel meeting, make sure that to often examine the situation of your wheel bearings, tire tread, and rims. When you are at it, fastidiously look at the grasp cylinder, hoses, and caliper items for early indicators of injury or brake fluid leakage.


The 225DX was one of many first to sport entrance telescopic forks and a rear mono-shock. This cutting-edge system supplied the ATC with smoother maneuverability and improved general dealing with over its competitors. Extra importantly, it made for a formidable 8.1-inch floor clearance that labored nicely with the car’s 45.3-inch wheelbase.


Size and width measurements of the 223-cc Yamaha DX are 71.1 x 40.2 inches (1,805 x 1,021 mm). Seat top is 28.3 inches (718.8 mm) and works for many physiques. Dry weight is 317 lbs (144 Kg) – a substantial mass for a 225-class machine and a possible dilemma for a novice rider caught within the mud. Sadly, weight/load limits and GVWR figures aren’t within the service handbook. However based mostly on the payload capacities of its same-class counterparts, it could be protected to say the three-wheeler can deal with as much as 200 lbs (91 Kg).


Commonplace options embrace Yamaha 225DX components reminiscent of serrated footpegs, sq. headlights, a contoured, MX-style seat, handgrips, rear hitch bracket, black-trimmed rear fenders, and a high-clearance entrance beak. Its tubular metal body is painted in black, matching the grips, fender trims, and seat. On the surface, the YTM225DXL and YTM225DR fashions look just about the identical – each trikes clad in Yamaha’s signature Competitors Yellow. To inform them aside, decide which one has a reverse gear.

Yamaha 225DX 3-Wheeler Pricing

The listing value for Yamaha 225DX ranged from $1,699 to $1,849 (‘83 YTM225DXK, ‘85 YTM225DXN), with the 1984 Yamaha YTM225DXL valued at $1,799 (at the very least $4,600 if bought right now). This quantity is consultant solely of base fashions and excludes equipment or another kind of add-on accessible by way of the dealership. With its piston displacement merely a fraction behind Honda’s ATC250R, the three-wheeler was thought of competitively priced and particularly appealed to riders searching for a compromise between price range and efficiency.

Public sale and dealer web site listings aren’t removed from the unique MSRP of the Yamaha 225 DX. Secondhand items promote for as low cost as $265 or as excessive as $1,000. Wheelers that price beneath $300 are predominantly bought for components or disused for prolonged durations. Others could also be working intermittently or with minor to persistent issues – reminiscent of engine flooding or puncture-prone tires. Conversely, pre-owned machines in glorious working situation begin at $735.

The 225DX Tri Moto Restomod

I’ve mentioned restomod suggestions in size in an article I did some time again on the 1980 Yamaha Tri Moto. However for the good thing about first-time readers, I’ll go over tested-and-proven strategies riders must prioritize:

Engine Energy-up

The inventory Mikuni carb is kind of restrictive and hinders the car’s high velocity, energy, and torque output. That is why riders go for greater carbs and efficiency exhausts like a Big Gun 07-1202 ECO ATV Silver Slip-On Exhaust (view on Amazon) to reinforce the Yamaha 225DX’s velocity ranking and energy supply. A Timberwolf 250 powerplant is among the many hottest carb swap decisions for knowledgeable ATC homeowners. Plus, its U-joint yoke snaps excellent in place within the 225DX A-arm after minor changes. Retrofitting a carburetor from an previous Huge Pink is an alternative choice.

Flashy Exterior

Given its age, secondhand 225DX items can get fairly rusted because of the severity of use and moisture or filth buildup. Fortunately, powder-coating and hydro dipping make it potential to revive the three-wheeler to its former glory. Prepping the plastics solely takes a number of steps. Simply be ready to spend between $600 and $1,000 (extra for polypropylene plastics) if you happen to resolve to make use of each coating strategies.

Suspension Upgrades

Though the Yamaha 225DX was one of many first ATCs to have a full suspension setup, there was nonetheless lots available on this space. Extra skilled Tri Moto homeowners go for a +3 swingarm, G-Power +2 Banshee hubs, Yamahauler rear-axle shaft, and YFZ450SE rear shocks to enhance the machine’s suspension efficiency. Moreover, they pair these enhancements with corresponding tires and different front-end alterations that make all the suspension system extra strong and conducive to tough dealing with.

Smoking the Competitors

Solely true-blue Yamaha 225DX fanatics would perceive and respect this pun. Truthfully, I discover it amusing that this assertion can sum up the highs and lows of the famed three-wheeler. Throughout its heyday, the small huge shot outshined its 250-cc counterparts with the conveniences and efficiency it supplied. However on the identical time, it was recognized for the path of smoke that it at all times appeared to depart behind – an issue that continues to exist extra so with secondhand 225 DX Tri Motos.

Yellow 1983 Yamaha 225DX Tri Moto 3 Wheeler

The Yamaha 225DX is a typically well-mannered, all-around trike. It has first rate energy, good suspension numbers, and provides a easy, snug experience on par with Honda’s ATC 200X and 250SX bikes. Its shaft drive is outstanding and renders the machine virtually maintenance-free. Dealing with-wise, the 225DX is healthier in muscling its method by way of obstacles and dust than its larger-displacement competitors and would have successfully bested the 250SX had it not been for the absence of a reverse gear.

On the draw back, a pre-owned 225 DX might smoke horribly and have a burnt-out major clutch. For some secondhand items, this situation goes away as quickly because the car operates extra ceaselessly. But when it doesn’t, mechanical savants suggest honing the cylinder, re-seating the valves, and placing new rings and valve seals. It’s also sensible to regulate the air-fuel combination (if operating wealthy) in the course of the course of. For extra complicated points, there are sections within the service handbook with detailed troubleshooting steps for resolving the issue.

About Yamaha

Yamaha Motor Co., Ltd. (or Yamaha Hatsudōki Kabushiki-gaisha) is a world-renowned Japanese producer recognized for its private watercraft, motorized merchandise, and ATVs. Initially an affiliate below then Nippon Gakki Seizo Co., Ltd., the agency parted methods with its mum or dad firm in 1955 to give attention to bike manufacturing. Over time, it has grown its product choices to incorporate scooters, motor bicycles, engines, turbines, and off-road automobiles such because the Yamaha 225DX. Yamaha has not appeared again since and is now an automotive powerhouse with over 52,000 world workers and 132 consolidated subsidiaries.

Conclusion – Yamaha 225DX Evaluation

The Yamaha 225DX might have been one of the vital short-lived ATCs in off-roading historical past. However that didn’t cease this three-wheeler from breaking floor and shifting all the {industry}’s course in the direction of what it presently is. These days, you’ll hardly discover any ATV with out an electrical starter. Equally, most big-bore behemoths excelling of their respective sub-segments equip a shaft drive that retains restore prices down and makes car maintenance lots simpler.

In hindsight, the 225DX may have benefited from an extended manufacturing run and additional enhancements to its suspension parts. However given the expertise and genius accessible on the time, the “Cadillac of the paths” was in its high type – a lot in order that it challenged {industry} chief Honda and different main ATV producers to form up and evolve. The quick stint of the Yamaha 225DX Tri Moto was greater than sufficient to show the machine’s price as an unrelenting contender. And in doing so, it confirmed Yamaha’s resolve to take the initiative and tackle the long run.

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