Kawasaki KR-1

Kawasaki KR-1
Manufacturer	Kawasaki
Production	1988
Engine	Ttwo stroke, parallel twin cylinder
Compression ratio	7.4:1
Ignition	Capacitor discharge
Transmission	6 Speed
Suspension	Front: 41mm stanchions, air assisted telescopic fork with unstopped preload adjustment Rear: Bottom Link Uni-Trak with air adjustable gas shock, unstopped preload, and four-way rebound damping
Brakes	Front: 2x discs 4 piston calipers Rear: Single disc 2 piston caliper
Front Tire	100/70 VR17
Rear Tire	130/60 VR18
Wheelbase	1365 mm / 53.7 in
Seat Height	855 mm / 29.7 in
Weight	123 kg / 271 lbs (dry),
Recommended Oil	K-tech 10W-40
Fuel Capacity	16 Liters / 4.2 US gal
Manuals	Service Manual

Engine

The engine was a Liquid cooled cooled Ttwo stroke, parallel twin cylinder. The engine featured a 7.4:1 compression ratio.

Chassis

It came with a 100/70 VR17 front tire and a 130/60 VR18 rear tire. Stopping was achieved via 2x discs 4 piston calipers in the front and a Single disc 2 piston caliper in the rear. The front suspension was a 41mm stanchions, air assisted telescopic fork with unstopped preload adjustment while the rear was equipped with a Bottom Link Uni-Trak with air adjustable gas shock, unstopped preload, and four-way rebound damping. The KR-1 was fitted with a 16 Liters / 4.2 US gal fuel tank. The bike weighed just 123 kg / 271 lbs. The wheelbase was 1365 mm / 53.7 in long.

Photos

Overview

Kawasaki KR-1

it is a human trait to shy clear of perfection, whether it is to avoid offending some deity or simply to leave something to do next, he major imperfection with the KR-1 was at it was available in Japan a full 12 months before it appeared here. And the disc-valve KR250-A1, first built in 1984, never made it here at all, apart from the odd grey-market import. Otherwise, the 250 Kawasaki did everything you might expect of a 50bhp machine which weighs 271 lb. It was significantly quicker than the RGV and the 1990, KR-1 S version has been uprated to give more power still — enough to make it some 5mph faster. Given the weight, less than 54 inches of wheelbase and 66 degrees of castor, the KR-1 could turn faster than a politician in full cry. Given all that, it was a surprise to find that the suspension not only worked, but worked well, combining with an uncramped riding position to make the bike comfortable at full tilt and even acceptable on long, boring motorways. The power characteristics and the tall gearing meant that it didn't like steady 70mph cruising. And the nature of the bike means sub-40mpg fuel consumption, which means you don't get very far on a standard tankful. But who needs perfection?

The KR1S' life story is as brief and spectacular as the Kawasaki's powerband. Launched in spring '90 (only a year after Kawasaki surprised everyone, especially Suzuki, with their RGV-eating KR-1), the completely redesigned KRl-S quickly established itself as a winner on the street and track. Two years later it was finished; no longer imported and soundly beaten by RGVs everywhere. The KR1-S took razor steering  and insane power-to-weight ratios a stage further than anyone had before. Tall gearing pushes it past 130mph and makes it still lOmph faster than even the latest RGVs. This is important when you're a budding headbanger recently graduated from a restricted 125.

The power delivery is stunning. From 6,000rpm the KR1-S lights up like a roman candle and sparkles all the way to 11,000, making a proper racing two stroke crackle rather than the RGVs polite chuffing. Although the two are evenly matched on horsepower, the KRl-S feels stronger because the RGV shuts down abrubtly at 12,000 while the KR1-S overrevs by 500rpm after peaking.

The KR1-S handling experience is a combination of light weight, instant steering, and overdamped suspension which adds up to superb racetrack manners and massive tankslappers on real roads. But bumpy back lanes are the

KR1-S' natural habitat, where slappers, an explosive powerband and whippet handling make the Kawasaki a high-adrenaline handful. Dual carriageways and motorways don't overwhelm the KRl-S. It's cruise at 80mph on the bottom edge of its powerband for as long as the tank lasts (90-110 miles), and do it in relative comfort thanks to a roomier riding position than the RGV. More important to impoverished teenagers in the early '90s was the price: in '91 a new KRl-S cost £3,779—£311 less than the RGV.

WHAT TO LOOK FOR

Raced KRs are easy to spat dried, lockWired nuts, crash damage on both sides of the bike or mint bodywork on corroded metahvorfc are all indications of track Me. Unless you want to race, steer dear. Unreiable horrors are harder to pick out. Sloppy factory quality control led to wildly varying engine tolerances. Common problems include wonky barrels causing piston slap followed by ring peg failure, with are consequences for al components concerned. Listen for top end knock when starting from cold. Other KR1-S probs: leaky base gaskets.

Make Model	Kawasaki KR1
Year	1988
Engine Type	Ttwo stroke, parallel twin cylinder
Displacement	249 cc / 15.2 cu-in
Bore X Stroke	56.0 x 50.6 mm
Cooling System	Liquid cooled
Compression	7.4:1
Induction	2x 28mm Keihin PWK
Ignition	Capacitor discharge
Starting	Kick
Max Power	55 hp / 41.0 kW @ 10500 rpm
Max Torque	3.75 kgf-m / 27.1 lb-ft @ 10500 rpm
Transmission	6 Speed
Final Drive	Chain
Front Suspension	41mm stanchions, air assisted telescopic fork with unstopped preload adjustment
Rear Suspension	Bottom Link Uni-Trak with air adjustable gas shock, unstopped preload, and four-way rebound damping
Front Brakes	2x discs 4 piston calipers
Rear Brakes	Single disc 2 piston caliper
Front Tire	100/70 VR17
Rear Tire	130/60 VR18
Wheelbase	1365 mm / 53.7 in
Seat Height	855 mm / 29.7 in
Dry Weight	123 kg / 271 lbs
Fuel Capacity	16 Liters / 4.2 US gal
Road Test	Suzuki RGV250 Yamaha TZR250 Kawasaki KR1 Bike Bike magazine Group test 1987