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Rating 8 8

Bajaj Discover DTS-Si 100cc

30th Sep 2009 7:00 am

Styling tweaks have given the original Discover a new lease of life, with this new 100cc segment variant successfully looking a tad more modern than its predecessors

  • Make : Bajaj
  • Model : Discover

The Discover DTS-Si does not sport a fresh face and shares its silhouette with the original Discover 125 DTS-i. But the all-black treatment to the new 100cc bikes smart five-spoke alloy wheels, front forks, engine, chain cover and neat-looking sheared silencer manages to mask its age.

A new battery-powered headlight is flanked by twin pilot lamps in the familiar headlamp cluster and provides bright, totally waver-free illumination at night. There are neat twin-pod instruments that offer riders a useful tripmeter, speedometer and fuel gauge, beacons for the turn indicators, neutral warning and battery. We found the grips and levers comfortable to use and the switchgear easy to work with. This includes a blue ride-control switch that helps riders maximise mileage by providing tactile guidance to prevent excessive opening of the throttle. The handle-mounted mirrors give a good view of the world behind.

The Discover 100 sports rubberised gearshift and rear brake pedals that feel comfortable and offer relatively better grip in the wet. The new bike follows the Discover family tradition by displaying its frame around the swingarm pivot region. A blackened alloy grab handle at the rear sits atop a stylish LED tail-lamp. We enjoyed the extra protection provided by the rear mudguard. We also found overall quality of the bike to be acceptable, with the bike displaying good paint lustre.

What’s part of the standard kit on the Discover DTS-Si 100cc is a maintenance-free battery as well as a self-start.

This is the first of the Bajaj bikes to adopt an improved ‘DTS-Si 2.0’ engine. While DTS-Si or Digital Twin Spark with swirl induction is a Bajaj-patented fuel economy boosting twin-plug technology, version 2.0 claims further benefits of swirl in the combustion chamber while retaining twin spark plugs to aid quicker and more complete combustion cycles. The twin-valve engine also uses a graphite-based piston coating that reduces friction between the piston and cylinder block, thereby increasing engine efficiency. An exhausTEC resonance chamber on the silencer works behind the scenes to further bump up low-end grunt.

Its single-cylinder, air-cooled and four-stroke unit displaces 94.38cc while the engine cylinder sports long-stroke dimensions of bore and stroke measuring 47 x 54.4mm. Like most 100cc bikes, the Discover 100’s engine is tuned towards fuel economy. The bike pumps out a modest 7.7bhp at 7500rpm, while producing a max torque of 0.8kgm at 5000rpm.

The Discover comes with a five-speed gearbox — a rarity in this segment — that shifts in an all-down pattern via a heel-and-toe-lever. While enthusiasts will welcome this added ratio for its fun factor, some true-blue commuters may find that the extra cog translates into extra work for them when riding in the city.

There is a good spread of torque throughout the rev range and enough low-end muscle in the powerband to allow the Discover to pull off urban overtaking moves thanks to well-thought-out ratios. The rubber-mounted engine feels smooth and refined, with vibrations firmly kept at bay. Our performance tests had the Discover completing a 0-60kph dash in 9.78sec with the bike reaching a true maximum speed of 90kph.

The Discover DTS-Si deploys a single downtube frame that splits at the engine and reunites at the swingarm. The swingarm itself is made of rectangle section metal. The new 100 uses twin telescopic forks up front and a pair of adjustable and gas-filled shock absorbers at the rear.

A high handlebar seats riders in an upright posture that’s comfortable for even tall riders. The seat is well padded and adequate for long distance riding. Ride quality is good, really spine-pampering with the bike efficiently soaking up all sorts of road undulations.

At 1305mm, the Discover has among the longest wheelbases in this segment. It does not mind being flicked through traffic. A combination of 130mm front and 110mm rear drums provide anchorage to the Discover DTS-Si. While brake feel at the lever is always reassuring, feedback from the tyres under heavy braking can be unnerving. Our best stop from 60kph to rest was 22 metres in 2.63 seconds.

ENGINE Petrol Petrol AT Diesel Diesel AT Electric
Fuel Petrol - - - -
Installation Inclined from vertical - - - -
Bore/stroke 47/ 54.4mm - - - -
Compression ratio 9.8:1 - - - -
Valve gear 2 per cylinder, sohc - - - -
Power 7.7bhp at 7500rpm - - - -
Torque 0.8kgm at 5000rpm - - - -
Power to weight 66.9bhp per tonne - - - -
TRANSMISSION Petrol Petrol AT Diesel Diesel AT Electric
Type 5-speed - - - -
Gearbox 5-down - - - -
BRAKES Petrol Petrol AT Diesel Diesel AT Electric
Front 130mm drum - - - -
Rear 110mm drum - - - -
SUSPENSION Petrol Petrol AT Diesel Diesel AT Electric
Front Telescopic forks - - - -
Rear Gas shocks, rectangular swingarm - - - -
BODY Petrol Petrol AT Diesel Diesel AT Electric
Wheels 5-spoke alloy, 17 inches - - - -
Tyres 2.75 x 17 front, 3.00 x 17 inches rear - - - -
Bajaj Discover DTS-Si 100cc
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