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Yamaha F J1100
The FJ1100 was the first litre-plus motorcycle to address the problem of all litre-plus motorcycles - how to make something fundamentally big and heavy handle responsively. The FJ is a genuine 150mph superbike, combining a huge and immensely strong engine with a low and fairly lightweight chassis. Until the FJ1200, it was Yamaha's flagship, their biggest and most powerful four-stroke motorcycle.
The motor is a compact, slightly inclined, DOHC, 16 valve transverse four, remarkable only for the amount of sheer, outright power it gives - 125bhp at 9,000rpm -which makes the FJ a king of wheelspin along its rapid path to a blistering top speed. What is unusual about the bike is the way the engine is mounted. Yamaha realized that serious weight-saving on a bike this big was a futile exercise, so they concentrated their efforts on keeping the weight, and indeed the bike, low and compact. Their 'lateral frame concept' consists of a high-tensile, box-section steel frame built along endurance racer lines. There are no top tubes running above the engine. Instead, two huge frame tubes laterally hug the motor's sides. Instead of meeting at the steering head, these two side tubes join in front of it; the steering pivot itself is supported by small-diameter tubing, fully triangulated off these main rails. The aim is to achieve the greatest possible steering head rigidity. Certainly it was a first for a Japanese production bike.
Sitting on 16in wheels, front and back, the FJ1100 feels remarkably low on the road. The seat height is a mere 30.7in yet there is good Ground Clearance. With a full tank it weighs 5561b yet the weight is hardly noticeable on the move. The bike's low and tight dimensions belie its size and it has none of the dead, top heavy feel of traditional 1100cc monster road bikes. It steers quickly and nimbly as intended. On small wheels with fat tyres, 4.4in of trail, a 30 degree head angle and a trim 58.3in wheelbase, the FJ was the first 1100 to prove as lively as many a middleweight motorcycle. It makes smooth and strong power effortlessly.
The wind-tunnel designed full fairing deflects the worst of the wind and the weather and helps the bike to an impressive top speed. It is so quick and powerful that it can easily deceive the rider about what speed he or she is doing. Early in 1986, Yamaha unveiled the FJ1200, an oversized big bore version with more power everywhere especially in the midrange. It is only a few mph faster at the top end. The chassis spec is virtually identical and only detail changes have been made.
Bike magazine 1984
Yamaha FJ1100 vs Laverda Jota vs Kawasaki GPz900R vs Honda VF1000F vs BMW K100RS
BMW K100RS
'The easy-going motor doesn't kindle any manic desire to keep up with the pack'
K100RS in a hot-shot, rip-snorting, balls-out...ultimate sportster comparison test. Everyone around you is dribbling and drooling and twiddling away at the preload doo-dahs, damping wotsits and air valves, and you're sat there wondering how to get in a quick 200 leagues without arriving back in Douglas after 37 and a bit miles.
'It's not a sportster,' said Mac, returning the keys after one lap. His tone was that of a man whose lamb has turned out to be mutton. 'But I like it.' There spoke a man who knew that the man who signed his expenses claims liked the RS too.
Arriving on the Island the next morning, we'd watched practice at Quarter Bridge, then gone for the traditional lap before breakfast. Somewhere between Braddan and Ballacraine I realised that, were it not for the fact that Mac was toting a nervous pillion, plus occasional hold-ups from the odd meandering course-learner's tranny, the RS and mo/wouldn't be in the line up come Parliament Square.
Hardly surprising really. Whereas the Laverda, Yamaha and Kawasaki have short, stiffly-sprung suspension at both ends, the BMW has a comparatively whopping 7.3in up front and more average 4.3in at the rear. The springs up front are fairly soft — so soft I forgot about several bumps on my way to work until I borrowed the Ninja.
Brecon Quaddy
HONDA VF1000F
'All the stuff's there to make one outrageous motorcycle but somewhere in Honda's design shop there's a wet willy'
Then the final piece of evidence came on that ride back. Problems with Jota meant for odd reasons that I finally set out from Heysham at 2am into the slooshing rain, more than a little fatigued and bleary-eyed after three days revelry and bike-biasing. The Honda motored through the buffeting storm, sending out a scorcher of a main beam to pick out the M6 lanes and roadwork cones. It was a shock to cut down to dip beam with its flat topped beam. Take a tip from Cibie, Honda and light up the nearside edge...
The motor is a bored and stroked version of the VF750 rather than a cutdown 1100 V4. It's been achieved with some neat touches: to allow for the wider bores in basically the same alloy block, the steel liners are now pressed in with the coolant running directly against the outside of the liner. This is what's called a 'wet' liner and is similar to the GPz900R. The bore is now 77mm diameter, the stroke increased by 5mm to 53.6mm giving an actual capacity of 998cc. Con-rods, big and small ends have all been strenthenend.
Over 100mph, it's neck stretch and wrist ache time
again folks.
Laverda Jota
'The Laverda makes a wonderful change from the other bikes soulless whirrings'
This was calibrated in kph, with illegibly small mph figures inside, and was obscured from my view by the fairing's swept-back screen. At leas that detail is only a problem if you're tall, unlike the awkward twin fuel taps and the horrible only-style Suzuki switchgear. On one occasion I managed the old favourite of blacking all the lights out when trying to use the dipswitch. . .
The Brembo brakes are excellent in the dry, almost
as good as the Kawasaki's discs, but they're not quite as immediate in the wet
at low speeds.
The only glitches are fuel consumption that often
drops below 30mpg and a dodgy spot at around 2500rpm (apparently that's where
the ignition advance comes in) which results in some very erratic behaviour if
you try riding along at that speed in town. Apart from that the motor's as
flexible and well-mannered as you could hope for from such a fire-breathing old
warhorse. If only we'd had more chance to let it show its paces.
Kawasaki GPz900R
'It was the red and grey Kawasaki that everyone felt happiest on when the going got tough'
Yamaha FJ1100
'Mean looking and low, the Yamaha offers promise and delivers - in spades'
Get one of these and you'd better recalibrate your diary. It took at least a week's custody of the FJ1100 before I got the hang of not arriving for appointments half-a-county away at least a pint ahead of schedule: you just aim in the general direction of your destination and delight in getting obviously lost, secure in the knowledge that the Yamaha will get you from anywhere to almost anywhere else in less time than you've got.
This tendency could be dialled out in part by upping rear suspension settings and completely vanishes with new rubber. It's probably worth experimenting with the various alternative tyres available: one reliable source claims Pirelli Phantoms are the answer.
The Laverda, at £3999 basic (£500 more with the tuning bits), comes closer to the Japanese bikes' performance but depends largely on subjective appeal and its Italian heritage. Apart from the RGS Corsa, it's the best non-Japanese musclebike around. Making a choice between the three Japanese machines promised to be harder than deciding whether to buy a BMW or a Laverda.
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Any corrections or more information on these motorcycles will be kindly appreciated. |