True to its trail-bike lineage, the Yamaha DT250 brings with it a promise of protected driving and journey. One of many main dual-sport machines in its heyday, the 250-cc wheeler was an answered prayer for DT 125 fans. It was modern, nostalgic, and easy – qualities wanted even in at present’s market.
The Yamaha DT250 was an enduro-style dual-sport bike produced by Yamaha from 1971 to 1982. This motorbike featured unobtrusive styling, an 85-mph prime velocity, and a YZ-adapted mono-cross rear suspension. It dealt with easily on the highway because it did on trails.
Service limitations apart, the Yamaha DT250 is a best choice amongst frugal riders and fans enamored by retro-styled bikes. Be taught extra concerning the DT250, and let this information enlighten you on its specs and endearing qualities.
About Yamaha DT250
Like its smaller-displacement sibling, the Yamaha DT250 is a descendant of the 1968 DT-1 Enduro – the trailblazer that kicked off the off-road-friendly two-wheeler area of interest for Yamaha.
The DT250 was the ninth largest motorbike class within the DT sequence and launched three years sooner than its 125-cc namesake. It launched at good timing, meant to coincide with the shift of shopper curiosity from road-legal to off-road-worthy autos.
Expectedly, the DT 250 will not be with out competitors, and it’s on this side that many fans discovered Yamaha missing. It might have been an opportune time to go all out on car enhancements and reap again in earnings spent on refinements.
Nonetheless, Yamaha appeared to have perceived the state of affairs in a different way. Had it executed the identical diploma of enhancement on the DT250 because it did on the RD400, the agency would have gone towards the very essence of the DT sequence. Whereas it’s true that dual-purpose machines must be functionally aggressive, they need to even be throughout the shopping for technique of most people.
In hindsight, the Yamaha DT250 trod the trail meant for it. In spite of everything, purpose-built wheelers ordinarily progress slowly however certainly. To assist this level, Yamaha did introduce some notable enhancements on the motorbike, specifically – the MX rear suspension, reed-valve torque induction, digital CDI system, and automated oil injection. Whereas not flashy, these upgrades improved the general efficiency and enchantment of the road path bike.
Yamaha DT 250 Specs & Options
An air-cooled, 2-stroke single-cylinder engine with torque induction brings the Yamaha DT250 to life. It has a bore-stroke ratio of 70 x 64 mm (2.76 × 2.52 inches). Engine displacement is 246 cm³ (15.01 in³), whereas the compression ratio is 6.7:1. A 28-mm Mikuni carburetor handles the air-fuel combination. A plunger-type oil pump and oiled foam rubber air filter full the bike’s powerplant meeting.
The dust bike’s engine configuration lends to a prime velocity ranking of 68 mph (109 km/h), most torque of 17.5 Nm (1.78 kgf-m, 12.95 ft-lb) @ 6,500 RPM, and 15.69 hp (11.7 kW) @ 5,400 RPM horsepower. Pre-1978 Yamaha DT250 fashions reportedly had a barely larger horsepower output at 20 hp (14.91 kW) @ 6,500 RPM and a 26% distinction in prime velocity at 85 mph (137 km/h) when in comparison with later-year variations.
(1977 Yamaha DT250F marketed figures: 23 bhp @ 6,000 RPM; 27 Nm/2.8 kgf-m, 20.25 ft-lb @ 5,000 RPM)
Gas & Lubrication
Tank capability is 9 liters (2.38 US gal) of unleaded gasoline with a minimal PON 87/RON 91 ranking. Gas travels by way of a membrane and lends to a powerful gas financial system of 94 MPG (2.50 L/100 km). For prime efficiency, the bike requires gas variants containing < 5% MTBE (Methyl Tertiary Butyl Ether), < 10% ethanol, or < 5% methanol. Nonetheless, veterans advise veering away from gas with methanol on account of its formaldehyde content material.
The engine oil capability is 1,200 ± 50 cc (dry) or 1,100 ± 50 (oil change) of Yamalube SAE 10W-40 2-stroke oil or its equal. For suitable variants, the minimal API grade required is SJ and will meet JASO T903 MA requirements. Chances are you’ll go for different manufacturer-recommended viscosity grades, relying on ambient temperature. When unsure, all the time check with the service handbook for specifics on oil necessities.
A handbook, 5-speed fixed mesh drum-shifter system and a moist multiple-disc clutch meeting ship energy to the bottom. A Daido DK520DS curler chain (with 104 hyperlinks together with joint) handles wheel spin. The dust bike’s wide-ratio transmission makes it corresponding to counterparts just like the Harley-Davidson SX250, Crew Inexperienced’s KE250B, and the Honda XL250 – to call a number of. For improved acceleration, it’s possible you’ll regulate the entrance sprocket 1-2 enamel decrease.
For reference, the inventory gear ratios are beneath:
|Main Discount Ratio||2.826 (65/23)|
|Secondary Discount Ratio||3.357 (47/14)|
|Transmission Gear Ratio (1st)||2.538 (33/13)|
|Transmission Gear Ratio (2nd)||1.789 (34/19)|
|Transmission Gear Ratio (3rd)||1.300 (26/20)|
|Transmission Gear Ratio (4th)||1.000 (23/23)|
|Transmission Gear Ratio (5th)||0.769 (20/26)|
A Contact Breaker Level ignition system and a major kick-starter get up the DT250. In comparison with an digital ignition system (which is commonplace for DT250 dust bikes), the ECU shuts the previous’s major circuit on or off.
Likewise, it runs on decrease voltage and distributes the identical to the ignition coil and wiring methods. It took virtually six years for Yamaha to vary the breaker-point ignition right into a CDI system.
Together with the 1978 Yamaha DT250, all pre-1980 fashions require an NGK B8ES spark plug with a niche of 0.7 – 0.8 mm (0.028 – 0.031 inches).
As for battery requirement, the fashions break up into two teams. 1974 to 1975 Yamaha DT250s had 4Ah/(10 HR) 6N4B-2A-3 battery formats (view on Amazon), whereas ’76 to ’79 DT 250s had 6Ah/(10 HR) 6N6-3B-1 batteries.
They differ in each amperage and dimensions and are non-interchangeable. The 6N4B-2A-3 format measures 102 x 48 x 96 mm (4.00 x 1.88 x 3.75 inches), whereas the 6N4B-2A-3 format measures 99 x 57 x 111 mm (3.88 x 2.25 x 4 .38 inches).
Tires & Brakes
E-type aluminum wheels are geared up with Dunlop® 3.00 x 21 4PR entrance tires and 4.00 x 18 4PR rear tires. This tire-and-wheel meeting mate to 160-/150-mm increasing drum brakes that present the DT250 stopping energy.
Within the occasion of injury or put on, swap the inventory rubber out for Shinko 700 Dual Sport Front Tires (view on Amazon). For critical mudding or extra aggressive tracks, change the rear tires with Dunlop D605 Dual Sport Tires (view on Amazon).
Beneficial tire strain relies on velocity and rider weight. For regular driving, chilly tire strain must be 127.5 kPa (1.3 kgf/cm², 18.5 psi – entrance) and 147 kPa (1.5 kgf/cm², 21 psi – again). For top-speed driving or with a passenger, tire strain must be 147 kPa (1.5 kgf/cm², 21 psi) and 176.5 kPa (1.8 kgf/cm², 25.6 psi) on the entrance and rear, respectively.
The long-travel suspension consists of a entrance oil-damped telescopic fork with a forward-mounted axle. On the again, you’ll find a DeCarbon-type, mono-cross swingarm taken from the YZ lineup. Every setup gives 195 mm (7.6 inches) and 140 mm (5.5 inches) of wheel journey, respectively.
A nitrogen-charged mono-shock with softer spring charges dietary supplements the rear cantilever. The complete suspension system lends to the DT250’s very good dealing with, respectable cornering, and improved efficiency on the tough.
Dimensions & Capacities
General car dimensions are 2,185 x 870 x 1,165 mm (86 x 34.3 x 45.9 inches – L x W x H) – precisely alike its greater sibling, the Yamaha DT400D. Later-year releases additionally retained the identical measurements, with slight enhancements in wheelbase (from 55.7 to 55.9 inches). The saddle sits at 856 mm (33.7 inches) excessive, whereas the bottom clearance lacks at 255 mm (10 inches). Minimal clearance later improved to 277 mm (10.9 inches) for succeeding fashions.
The bike’s dry and moist mass regularly elevated since its first manufacturing mannequin. From 129 Kg (284 lbs.) in 1974, the DT250 went on so as to add one other six (6) kilograms to its curb weight. Redesigning the gas tank and taking a bit away from the gas capability helped trim the moist weight down for post-1977 fashions to 131 Kg (289 lbs.).
An aluminum skid plate protects the crankcase from scratches and gnarls. Flip alerts are tucked in on the entrance whereas protected by rubber mounts on the again. Serrated, folding footpegs are 13 inches excessive, supporting a extra snug however aggressive driving place. Spherical headlights wrap up the DT250’s traditional look, which is very attribute of its period.
As already established, among the many Yamaha DT 250’s strongest charms is its nostalgic, classic styling. It prides itself on its ’70s look and twin items like brake levers, instrumentation, and duplex body. Nonetheless, it acquired little or no to virtually no beauty upgrades all through its run. Redesign of its gas tank and seat comprise a lot of the bike’s aesthetic enhancements.
Regardless of this shortcoming, the DT250 is well-appreciated for its practicality and even weight distribution. This works within the two-wheeler’s favor since it’s a bit heavy for a 250-class dust bike. Fortunately, there are tons of aftermarket choices on the market that will allow any proprietor to shed some weight off the path bike and stop it from trying too dated.
Yamaha DT250 Value
The Yamaha DT250 listing worth went up by a bit over $500 from its debut to its final-year manufacturing mannequin. Whereas this looks as if a small mark-up by at present’s requirements, this 250-cc wheeler was one of many pricier choices throughout its time.
Apparently, fans who purchased their share of the long-lasting bike appear to be reaping the rewards of a near-mint, well-maintained unit. These days, the DT250 sells throughout the vary of $425 to $8,545 – simply primarily based on Nada Guides’ knowledge.
|Mannequin 12 months & Trim||Listing Value||Retail/Commerce-in|
|1971 DT1E Enduro 250||N/A||$730 – $7,275|
|1971 DT1MX Motocross 250||$730 – $8,545|
|1972 DT2E Enduro 250||$730 – $4,745|
|1972 DT2MX Motocross 250||$730 – $7,275|
|1973 DT3 Path and Enduro 250||$495 – $3,510|
|1974 Yamaha DT250A||$949||$425 – $3,195|
|1975 Yamaha DT250B||$425 – $3,195|
|1976 DT250C||$1,087||$425 – $3,195|
|1977 DT250D||$1,089||$425 – $3,195|
|1978 Yamaha DT250E||$1,198||$425 – $3,195|
|1979 DT250F||$1,474||$730 – $2,655|
Yamaha DT250 Execs and Cons
- Charming, classic styling by no means fails to captivate customers and avid followers.
- A contoured saddle seat makes room for 2 riders whereas offering driving consolation.
- The rear swingarm lends to the bike’s spectacular dealing with, particularly off-road.
- Mechanical parts are easy and virtually maintenance-free if properly taken care of.
- Restore and substitute components are available out there because of the lineup’s enormous aftermarket assist.
- Some riders discover that the bike doesn’t encourage confidence when driving, particularly on extra technical terrain.
- The bike’s classic seems are reflective of its equally classic efficiency.
- Steering head bearings are a sure-fire ache level for this wheeler, even when brand-new.
- In inventory type, the bike doesn’t include a rear baggage rack. This isn’t that large of a problem, though fans wished it had the accent from the get-go.
- Up till 1982, the wiring and electrical parts of the bike had been 6V. If you wish to improve headlamps, enhance gentle distribution, and make your bike street-legal, buy a 12V converter equipment.
- There’s a slight delay in engagement when squeezing the entrance brake lever. Fortunately, veterans have found that an ’81 YZ250 backing plate with two levers urgent the brake footwear from two separate places resolves the issue. Naturally, it will likely be a lot better to modify to a entrance disc brake.
Not like present dual-sport machines, the DT250 is designed to be used 70% off-road and 30% on-road, which explains its seemingly non-existent stopping energy on pavement, plus different service limitations. Its dealing with and suspension geometry is healthier suited to dust roads.
Though it was based in 1887, Yamaha Motor Firm Restricted didn’t start its journey within the automotive world till 1955 – when it parted methods with its mum or dad firm shortly after World Struggle II. From manufacturing musical devices, Yamaha’s founder would have by no means guessed that it could be a gamechanger within the motorcycling and ATV markets. Quick ahead to at present, Yamaha is a well-renowned international chief unmatched in its water car gross sales and improvements in a number of industries.
Conclusion – Yamaha DT250 Overview
The Yamaha DT250 could have solely acquired a number of styling upgrades throughout its interval. However what it lacked in aesthetics, it made up for within the issues that mattered – amongst them the ’72 reed-valve torque induction, the ’77 cantilever rear suspension, and the shift to a CDI system in ’79.
Not at all is that this traditional faultless. However like most pioneering autos, it provides a glimpse of the near-perfectibility of dual-purpose bikes. The DT250 continues to problem the driving prowess and the mechanical genius of leisure riders and fans alike. And if you’re up for this type of expertise, the Yamaha DT250 is, undoubtedly, your good journey.