Yamaha RD350

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Yamaha RD350
Yamaha RD 350
RD 350
RD 350 01

The RD350 was a motorcycle produced by Yamaha. It evolved directly from the piston port (pre-reed valve intake tract), front drum-braked, 5 speed Yamaha 350 cc "R5".[1]

It featured a reliable aircooled, parallel twin, 6 speed (in some markets, such as the UK, the first model was sold in 5-speed form), reed valve equipped intake tract two-stroke engine. Available in either a dark green or brandy red with white and black side details with metal emblem "Yamaha" on the tank RD350 (1973), the RD350A (1974), simple purple tank with "Yamaha" decal on the tank, and the orange with white RD350B (1975). The B model (in the UK at least) also featured a silver and black colour scheme.

All models were equipped with "Autolube" automatic oil injection, relieving the user from the need to mix gasoline and two-stroke oil.[2]

Rim sizes were 18" WM2 (1.85") front and 18" WM3 (2.15"), both being of chromed, wire spoked steel construction. In the UK, rim sizes were 1.60 front and 1.85 rear.

Brakes were: single front disc brake and a rear drum brake, a combination described by Cycle Magazine as the best in its class.

The frame dimensions of the street 350 were very similar to the famous Yamaha TZ250 and TZ350 series factory road race bikes, differing mainly in weight and front fork rake - the RD being ~27 degrees and the TZ being ~25 degrees. The frames appeared similar, side by side, with the street frame adorned with many brackets for the street equipment. The weight difference was substantial though, with the street going RD frame weighing almost twice as much as the "TZ" roadrace race frame.

The stock bike made about 39 to 41 true rear-wheel HP at about 7500 rpm - very fast for the time. A contemporary of the RD was the Kawasaki H2 750cc Triple, said to make 72 to 75 true HP (tested by Cycle Magazine at 55 bhp).

The 350 evolved into the more refined and cleaner running RD400C in 1976, the "D" and "E" in 77-78 and the final model, the white 1979 RD400F.

The RD Name

XS = 4 stroke tourer
XV = 4 stroke V
DT = 2 stroke trail
RD = 2 stroke road


The RD350B in India

The RD350B was assembled in India between 1983-1990 by Escorts group under the brand name Rajdoot 350. It did not repeat the worldwide success of the RD350B in the Indian market. Its lackluster sales figures can be attributed to high purchase price and poor fuel efficiency. However, it established Yamaha as a performance bike manufacturer in India. There were two models for the Rajdoot 350 - High Torque and Low Torque. Compared to the Yamaha RD350B that made 39 crankshaft bhp, the Indian-made HIGH TORQUE made 30.5 bhp (22.7 kW) and the later LOW TORQUE made only 27 bhp (20 kW), all in quest of better fuel economy. By the time the production ended in 1990, the bike was completely indigenized with very little Japanese part content.

Owners clubs and organized rides are existent in almost all major cities. A lot of the bikes got scrapped or became non-runners due to lack of spares in the early 1990s. However, specialist dealers are supplying all major spares that are locally made or imported from USA and Singapore. Also, Yamaha India has promised to supply all spare parts for the RD350 henceforth (Needs to be Verified).

The RD 350 was the very first super performance offering to the Indian Consumers at a time (1983) when the only bikes in India were the Bullet 350, the Jawa (Yezdi) 250 2 stroke and Rajdoot 175 cc 2 stroke. The other two wheelers being geared scooters like Bajaj Priya, Chetak, Allwyn Pushpak, Vijay and Lambretta. The original Japanese RD 350 had 40 bhp but the Indian Editions were detuned to 31 bhp due to lower fuel quality in India and also to increase Mileage.

The first HT edition of the RD 350 had too much power for the average Indian Rider as back then the Indian Market was not used to such a performance product The RD was a crotch Rocket capable of hitting 165 KM/HR in 6th gear. The RD used to frequently wheelie at the hands of inexperienced riders, being a high revving 2 stroke the bike was uncontrollable except a handful of experienced and mature riders. This prompted Yamaha to bring a detuned version of the RD 350 LT (low torque) which had 27 bhp with better pick up but less top speed & slightly better mileage.

The RD returned a mileage of anywhere between 6 to 23 km/ltr depending on how it was driven. The RD was fully imported in earlier models but by 1990 the bike was manufactured completely by Escorts Yamaha in India. The name RD stands for “Race Derived” performance and had technology from the Motogp bikes of the 1970′s. The bike had cult status all around the world since it was produced from the early 70′s in Europe, Japan and America. The bike stopped production in America in early 1980′s due to stricter emission and sound norms.

Unfortunately the RD did not enjoy that much success in India. The running costs was the greatest deterrent for the Indian rider to buy the RD and with the reputation of it being a “Lethal” bike ensured the sales of the RD was poor. Some people thought RD stood for “Rapid Death” ! Yamaha promoted the bike with the line “For the few who dare to live their Dreams” but that’s what happened literally in reality. The Hero Honda CD 100 which was launched in the 1985 further dented the RD’s sales figures as it had better mileage. Yamaha still continued to offer the RD LT. The RX100 was later launched in 1985 and it continued to sell better than the RD. Finally the RD 350 was discontinued by Yamaha in 1990 after years of frustration. The “Fill it, Shut it, Forget it” era marked the demise of the RD 350.

Technical Aspects: The RD was a twin cylinder “Reed Valve” air cooled 347 cc engine with each cylinder having a displacement of 173.5 cc. The RD had a slick 6-speed close ratio gearbox with 1 down 5 up pattern. The RD also featured “Torque Induction” ignition technology of Yamaha. The RD could do 0-100 in 7 seconds and a top speed of 165 km/hr in its heyday. The RD could touch 150 km/hr in just 16 seconds and was the first bike to have a tachometer in India.

The RD had twin exhausts and the Indian models had only 150 mm drum brakes at both ends.Coupled with the skinny tires the RD had scary high-speed handling and braking control characteristics. The RD is still the performance benchmark of any production bike in India and even after 25 years no Indian performance bike has even come close to it.

The Race RD’s were modified RD 350 for track use at the MMSC race track in Chennai and ran on Aviation fuel (white kerosene)and also 97 Petrol. The Race RD’s were turbocharged and had smaller sprockets and wheels, which pushed the power up to 85 bhp. The top speed was in excess of 220 km/hr. The bike had just the chassis, suspension, large 25 ltr fuel tank, disc brake on both ends and a thin sponge cushion for seat as everything else was removed to lighten up the bike. The Race RD was very light and agile and was very different from the Stock RD. The Race RD’s had modified powered up exhausts .The Race RD was the “Undisputed King of the MMSC Race Track” before it was discontinued from racing.

The RD was the first proper performance Superbike in India and it still enjoys cult status.Performance Purists still swear by it and many RD clubs are found all around the country. The RD had many editions like RD 400, RD 500 LC (Liquid Cooled) all of which enjoyed considerable success throughout the world and attained cult status.The RD 350 was the Greatest Landmark in performance biking in India, which paved the way for performance offering to India’s enthusiasts.

References

  1. ^ Richard Backus (November/December 2009). "Yamaha R5 350 Twin". Motorcycle Classics. http://www.motorcycleclassics.com/motorcycle-reviews/yamaha-r5-350-twin.aspx. Retrieved 2009-11-11. 
  2. ^ Robert Smith (January/February 2010). "Yamaha RD350". Motorcycle Classics. http://www.motorcycleclassics.com/motorcycle-reviews/yamaha-rd350.aspx. Retrieved 2009-05-21.