Yamaha IT175

Last updated

Yamaha IT175 belongs to the 'International Trial' family of motorcycles, produced during the 1970s and 1980s. The machine is derived from the Yamaha YZ range of competition motocross bikes with modifications for use in competition enduro, hare and hounds and trail riding.

Contents

The bike uses an air-cooled, two-stroke, single-cylinder engine with pre-mixed fuel. It is kick start only.

There are three derivations of the machine for the global market. A U.S. and Canada market version, a European version and an Oceanic version for other World markets.

The IT bikes were designed and sold as enduros and can still be plated and registered today, provided you make the necessary modifications to the tail light. Another option is to get a historical plate and use the old brake signal along with your other hand signals for turning.

Other bikes in the IT range include IT125, IT200, IT250, IT425, IT465 and IT490.

The IT range was superseded by the WR (Wide Ratio) in 1991 with the introduction of the WR200, and the WR250 in 1993.

The Environmental Protection Agency (EPA) invoked new regulations restricting Two Strokes in the early 2000s and new rules were set by the American Motorcyclist Association (AMA) which set the path for the development of the less powerful four-stroke engines dominate in the sport today.


All Bike Technicals

Engine: Two Stroke, Single Cylinder, Reed-valve Inducted

Oil / Fuel Mixture Ration => 20:1

Piston Size => 66.0mm

Bore x Stroke => 66 x 50mm

Cooling System => Air Cooled

Transmission => 6 Speed

Front Tire Size => 3.00 x 21

Rear Tire => 4.10 x 18

Front/Rear Brakes => Drum

Starting => Kick

Ignition => CDI


1977 [1]

The IT175D was first introduced in 1977 using a bored out 125 cc (7.6 cu in) motocross engine giving 171 cc (10.4 cu in) and using the same port design as the YZ. A 34mm carburetor was used along with a reed intake valve. The bike was given a six-speed gearbox with a very low ratio first gear to help in tackling technical trial sections. The frame was based on that of the YZ but the steering rake was increased to lengthen the bike and improve high speed stability, facilitated by a high sixth gear. Rear suspension adopted lessons learned from the YZ and used a de carbon monoshock unit from Kayaba. Forks had less travel than those of the YZ [2]

Considerable thought was given to features to improve reliability and usability over extended tests. The rear wheel featured a quick release design and a tool carrying kit was mounted to the rear fender.

Technicals

Compression Ratio => 7.4:1

Induction => 34mm Mikuni Carburetor

Max Power => 21.55 Hp / 15.8 Kw @ 9500RPM

Wheelbase => 1410mm / 55.5 in

Seat Height => 876mm / 34.5 in

Ground Clearance => 254mm / 10 in

Fuel Capacity => 9.5 Liters / 2.5 US Gallons

1978

Introduction of the IT175E. Minor changes.

Technicals

Compression Ratio => 7.4:1

Induction => 34mm Mikuni Carburetor

Max Power => 21.55 Hp / 15.8 Kw @ 9500RPM

Wheelbase => 1410mm / 55.5 in

Seat Height => 876mm / 34.5 in

Ground Clearance => 254mm / 10 in

Fuel Capacity => 9.5 Liters / 2.5 US Gallons

1979 [3]

The IT175F featured a beefed up frame and more suspension travel as per the mode of the times. The engine tune was modified slightly to give the bike more mid-range power.

The 1979 IT175F model front fork trail was reduced to quicken the steering response and the CDI ignition system was upgraded from the earlier D/E model bikes.....this was the last year for LH side countershaft sprocket model of the IT175. Check out Yamaha-Enduros group for great data on all early 2-stroke Yamahas.

Technicals

Compression Ratio => 7.5:1

Induction => 34mm Mikuni Carburetor

Max Power => 20.60 Hp / 15 Kw @ 8500RPM

Wheelbase => 1375mm / 54.1 in

Seat Height => 877mm / 34.5 in

Ground Clearance => 269mm / 10.5 in

Fuel Capacity => 9.5 Liters / 2.5 US Gallons

1980 [4]

For 1980 the IT175G caught up with the pace of motocross development and shared the frame of the YZ125G. This allowed the rear shock to move to a laid down position, bolted to the top of the frame backbone. The shock itself was adjustable for preload and rebound and a box section aluminum swingarm was used for the first time along with 36mm forks with air caps.

A new engine was developed in 1980, based loosely on the YZ125G. The new engine switched the drive chain to the right side where it has stayed ever since. The engine was detuned to give more usable power and given a 32mm power jet carburetor.

Technicals

Compression Ratio => 7.9:1

Induction => 32mm Mikuni Carburetor

Max Power => 19.86 Hp / 14.6 Kw @ 8000RPM

Wheelbase => 1417mm / 55.8 in

Seat Height => 899mm / 35.4 in

Ground Clearance => 290mm / 11.4 in

Fuel Capacity => 11 Liters / 2.9 US Gallons

1981 [5]

IT175H. No major changes other than all white plastics for the U.S. version.

Technicals

Compression Ratio => 7.9:1

Induction => 32mm Mikuni Carburetor

Max Power => 19.86 Hp / 14.6 Kw @ 8000RPM

Wheelbase => 1417mm / 55.8 in

Seat Height => 899mm / 35.4 in

Ground Clearance => 290mm / 11.4 in

Fuel Capacity => 11 Liters / 2.9 US Gallons

1982 [6] [7]

IT175J was introduced. This had a better exhaust which provided better power and ground clearance. The transmission was updated to have more torque at lower RPMS. The carburator is back to 34mm. Yamaha created the YEIS Boost Bottle and this bike had one. The bottle stores intake pulses trapped between the carb and closed reeds, allowing faster throttle response and better low end power.

Technicals

Compression Ratio => 7.9:1

Induction => 34mm Mikuni Carburetor

Max Power => 19.86 Hp / 14.6 Kw @ 8000RPM

Wheelbase => 1417mm / 55.8 in

Seat Height => 899mm / 35.4 in

Ground Clearance => 290mm / 11.4 in

Fuel Capacity => 11 Liters / 2.9 US Gallons

1983 [8]

IT175K. Minor upgrade.

Technicals

Compression Ratio => 7.9:1

Induction => 34mm Mikuni Carburetor

Max Power => 19.86 Hp / 14.6 Kw @ 8000RPM

Wheelbase => 1417mm / 55.8 in

Seat Height => 899mm / 35.4 in

Ground Clearance => 290mm / 11.4 in

Fuel Capacity => 11 Liters / 2.9 US Gallons

Related Research Articles

<span class="mw-page-title-main">Honda A engine</span> Reciprocating internal combustion engine

The Honda A series inline-four cylinder engine is used in 1980s Honda Accord and Prelude models. It was introduced in 1982, with the second-generation Honda Prelude, and available in three displacement sizes: 1.6-, 1.8- and 2.0-liters. It features cast iron block and aluminum SOHC head design with three valves per cylinder for a total of 12 valves. It was available in carbureted and fuel-injected configurations

<span class="mw-page-title-main">Yamaha SRX</span> Type of motorcycle

The Yamaha SRX is a motorcycle that was manufactured from 1985 to 1997 by the Yamaha Motor Company. Not to be confused with the Yamaha Sidewinder SRX, which is a snowmobile.

The Banshee 350 (YFZ350) was an All-Terrain Vehicle (ATV), produced by Yamaha Motor Company. It was manufactured in Japan from 1987 through to 2012, They were available in the United States from 1987 to 2006, in Canada until 2008 and in Australia from 1998 until 2012. The Banshee utilized a two-stroke twin-cylinder non-powervalve system version of Yamaha's RZ350.

<span class="mw-page-title-main">Suzuki GSX-R750</span> Sports motorcycle

The Suzuki GSX-R750 is a sports motorcycle made by Suzuki since 1984. It was introduced at the Cologne Motorcycle Show in October 1984 as a motorcycle of the GSX-R series for the 1985 model year.

<span class="mw-page-title-main">Yamaha SuperJet</span> Type of personal watercraft

The SuperJet is a stand-up type personal watercraft (PWC) made by Yamaha Motor Corporation. Part of Yamaha's WaveRunner line of watercraft, it was introduced in 1990 and has become one of the most successful stand-up personal watercraft ever made. All SuperJets, including the engine, are hand-built in Japan. Credit for the design is given to Clayton Jacobson II.

<span class="mw-page-title-main">Yamaha DT200</span>

The Yamaha DT200 is a dual-purpose motorcycle manufactured during the 1980s, 1990s, and continues into the 2000s (decade) by the Yamaha Motor Company. Though never imported into the US, the rest of the world, including Canada, received some of these models. The DT200LC began production in 1983bc. It also was very similar to the DT125LC. This model continued production until 1988.Then, in 1989 a totally new model was introduced, DT200R (3ET), as well as a similar DT125R. In Canada, the DT125LC/R was never imported.

<span class="mw-page-title-main">Yamaha WR450F</span> Type of motorcycle

The Yamaha WR450F is an off-road motorcycle made by Yamaha Motor Company. It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine. First offered in 1998 at 400cc, it shared many components and design concepts with the YZ400F motocross model. It is basically the racing YZ450F detuned slightly for more controllable power, with a headlight and lighting coil, softer suspension, a kickstand, lower noise specifications, larger radiators and lower emissions. The WR in the name indicates a wide-ratio gear box common to most enduro or trail bikes and stands in contrast to the close-ratio gearbox essential to a motocross racer. Over the years the WR has benefited from the advances made in the YZ motocross version gaining displacement and advancements such as an aluminum frame and improved suspension. Over much of its life the weight of the WR450F has remained fairly constant ranging from 244 to 249 pounds dry weight.

<span class="mw-page-title-main">Yamaha YZ450F</span> Type of motorcycle

The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation. It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution. The 2006 YZ250F and YZ450F were the first production motorcycles equipped with titanium suspension springs.

<span class="mw-page-title-main">Flyscooters</span>

Flyscooters, formerly known under the name Znen, was an American company that marketed gas-powered motor scooters manufactured in China and Taiwan. The company was founded in 2006 in Florida by scooter enthusiasts Leon Li and Daniel Pak, and ceased operations in 2010. During the operating life of the company, Flyscooters' basic business model was to import low-cost scooters from abroad and distribute them under the Fly brand name to a network of retail scooter dealerships across the United States, providing dealers with warranty and spare parts support.

<span class="mw-page-title-main">Yamaha TX500</span> Type of motorcycle

The Yamaha TX500 is a two-cylinder standard motorcycle built by Yamaha and sold in 1973 and 1974. Early models closely resembled the Triumph Bonneville in style. In 1975 the bike was renamed XS500 and then continued to be updated until 1978 when sales ended in the USA. In Europe, the model was available through 1980.

<span class="mw-page-title-main">Yamaha Royal Star</span>

In 1996 Yamaha introduced the Royal Star motorcycle. This motorcycle uses the basic power package from the Yamaha Venture Royale.

<span class="mw-page-title-main">Yamaha Enticer</span> Entry-level cruiser motorcycle

The Yamaha Enticer is an entry-level cruiser motorcycle that was produced from 2002 to 2006 in India. It is no longer in production. It featured a feet-forward cruiser-type riding position and was available in two trim levels, the regular and the delux. The delux variant had a self-starter and disk brakes for the front wheel.

<span class="mw-page-title-main">Hirth F-33</span> German two-stroke aircraft engine

The Hirth F-33 is a single cylinder, two stroke, carburetted aircraft engine designed for use on ultralight aircraft, including powered paragliders and ultralight trikes. the engine is noted for its extremely light base weight of 35 lb (16 kg). It is manufactured by Hirth of Germany.

The Hirth F-23 is a twin cylinder, horizontally-opposed, two stroke, carburetted or optionally fuel injected aircraft engine designed for use on ultralight aircraft. It is manufactured by Hirth of Germany.

<span class="mw-page-title-main">Hirth 2702</span> German two-stroke aircraft engine

The Hirth 2702 and 2703 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters, and small homebuilts. It is manufactured by Hirth of Germany.

The Hirth 3202 and 3203 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines, with optional fuel injection, designed for use on ultralight aircraft, especially two seat ultralight trainers, gyrocopters and small homebuilts. It is manufactured by Hirth of Germany.

<span class="mw-page-title-main">Aprilia RX/SX 50</span> Type of motorcycle

The 2006 Aprilia RX/SX 50 is a street/off-road motorcycle widely produced by Aprilia. It is powered by a six-speed, carburetor-fuelled, nikasil-lined and cast iron single-cylinder two-stroke engine manufactured by Derbi/Piaggio.

<span class="mw-page-title-main">Kawasaki A1 Samurai</span> Type of motorcycle

The Kawasaki A1 Samurai is a 250 cc (15 cu in) standard class Kawasaki motorcycle which was sold from 1967 through 1971.

<span class="mw-page-title-main">Derbi Senda 50</span> Type of motorcycle

The Derbi Senda SM 50 is a 50 cc motorcycle made by Spanish company Derbi. It is one of the most popular bikes made by Derbi due to its appeal to young riders, its styling and its amazing tuning possibilities. The bike itself uses an EBS/EBE, D50B0 or D50B1 engine which produces a staggering 5bhp. The Derbi Senda is identically constructed as the Gilera SMT 50. Between 1995 and 2005, Derbi was produced with an EBS / EBE engine, and after 2005, D50B0 / D50B1 engines were used until 2023 when production ended.

<span class="mw-page-title-main">Yamaha XJ1100</span> Type of motorcycle

The Yamaha XJ1100 is a Japanese standard motorcycle that was produced for only one year in 1982 in the US and 1983-84 in Canada. This motorcycle employed almost the same motor as its predecessor, the XS 11. The motor was a four-stroke, transverse-mounted four-cylinder engine with dual overhead cams. Its 1101cc engine was making 95 hp at the crank, paired with a 5-speed gearbox and shaft drive.

References

  1. "Yamaha IT175D". www.motorcyclespecs.co.za. Retrieved 2023-11-16.
  2. Yamaha Dirtbikes, Colin Mackellar, Osprey Collectors Library, ISBN   0850456606.
  3. "1979 Yamaha IT 175". www.motorcyclespecs.co.za. Retrieved 2023-11-16.
  4. "1980 Yamaha IT 175". www.motorcyclespecs.co.za. Retrieved 2023-11-16.
  5. "1981 Yamaha IT 175". www.motorcyclespecs.co.za. Retrieved 2023-11-16.
  6. "Yamaha It175j | Cycle World | JULY 1982". Cycle World | The Complete Archive. Retrieved 2023-11-16.
  7. "1982 Yamaha IT 175". www.motorcyclespecs.co.za. Retrieved 2023-11-16.
  8. "1983 Yamaha IT 175". www.motorcyclespecs.co.za. Retrieved 2023-11-16.