Honda VFR 750 F.

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The VFR 750 F is a sports tourer from the Japanese motorcycle manufacturer Honda . The vehicle, which was offered in several model variants from 1985 to 1997, has a V-engine with four cylinders and a displacement of 750 cm³. In 1998 it was replaced by the Honda VFR 800 FI .

The VFR 750 F achieves exceptionally high mileage in all model series, well over 100,000 kilometers are more the rule than the exception. Also because of this and because of the strikingly solid workmanship, the VFR models are sought-after vehicles on the used market.

history

1985-1987: RC 24 / I

Honda VFR 750 F, model RC 24, built in 1987

In the late summer of 1985, Honda presented the VFR 750 F, a completely newly developed model. The engine was also redesigned. The motorcycle had a streamlined full fairing and a light metal bridge frame. It was the successor to the VF 750 F and intended as an alternative to the Suzuki GSX-R 750 .

In contrast to its predecessor, the V4 engine of the VF 750 F had a crank pin offset of 180 degrees instead of zero degrees. It was possible to save 400 grams on the crankshaft. The cylinder heads were also redesigned. The Keihin - carburetor were placed in a flow-favorable position. Single rocker arms were used for the valve train . The camshafts were driven by gears. Overall, the engine was 1.2 kg lighter than that of the previous model. To improve the oil circuit, an oil pump was used before and after the oil cooler. This enabled the oil temperature to be reduced by around 20% and the formation of foam avoided. A 4-in-2 system served as the exhaust system. Compared to the previous model, the firing order has also been changed.

Based on the experience gained with the RVF 750 racing machine , the frame was designed as an aluminum bridge construction made of extruded profiles. The steering head and the engine mounts were also made of light metal. The rear frame was made of tubular steel.

The three-spoke cast wheels reduced the weight by 2.6 kg compared to the predecessor. The braking system has also been improved and lightened. The floating brake calipers of the disc brakes with double-piston braking systems have been given a new shape and have been recalculated. The brake discs were screwed directly onto the cast wheels and perforated to save weight and improve "wet braking".

The seating position was sporty and relaxed. This made the motorcycle suitable for longer tours as well as for driving on winding country roads. Compared to other 750 class motorcycles, the VFR 750 F had good and safe cornering. Even when driving fast on poor roads, there was no nervousness in the chassis or handlebar swaying.

The motorcycle was offered for sale in Germany in 1986 for DM 12,243 and in 1987 for DM 12,750. The VFR 750 F regularly achieved test wins in Motorrad magazine , not because it was the fastest, but because the overall package was impressive.

1986: VFR 750 RK - NF1

Shortly after the new VFR, the Honda Racing Corporation (HRC) offered a conversion kit that increased the engine output for racing use to 92 kW (125 hp) at 12,000 rpm. Displacement and compression remained unchanged, while other carburetors, cylinder heads and special camshafts as well as a different gear ratio supported racing. Other changes included the exhaust, the hand brake pump, controls, gear ratios as well as the fork and the rear shock absorber.

1988-1989: RC 24 / II

In 1988 Honda made further improvements to the motorcycle as part of model maintenance measures. The stanchion of the front fork was enlarged to 41 mm. With the anti-dive system TRAC, the setting option was removed. To improve the brakes, larger brake discs were used on the front wheel. For the wheels, they changed 16 /18 -Rädern to 17 inches at the front and rear. To improve the wind protection, a higher and adjustable windshield was installed.

The engine also received some modifications. So the inlet valves were changed and the air passage of the carburetor enlarged. In contrast to the earlier models with a V4 engine, the models easily achieved mileage of 70,000 kilometers and more.

The machine had a list price of DM 13,550 in 1988 and DM 14,770 in 1989. Between 1986 and 1989, 4458 VFR 750 Fs were sold in Germany.

1990-1993: RC 36 / I

Honda VFR 750 F, model RC 36 / I

The successor to the RC24 was presented on the Misano circuit in autumn 1989 . Stylistically, the new model was the VFR 750 R ajar.

The engine had the same stroke-to-bore ratio as the previous model. With narrower cylinder heads and a carburetor angle increased to 52 degrees, the intake ports became steeper and straighter. The design was thus based on the motor of the RC 30. This engine also had valves operated by bucket tappets.

A larger airbox improved the machine's passage. In addition, the maximum output was now already at 10,000 min -1 achieved. This vote was better suited for road use.

The 40 mm smaller cylinder heads made it possible to place the engine further forward and lower. This made it possible to lower the focus. Together with the shorter wheelbase, even better handling properties were achieved. The roughly 14 kg heavier motorcycle than the RC 24 rolled on much wider rear tires. As a result, the straight-line stability was retained despite the improved handling. The bridge frame consisted of pentagonal extruded profiles and was also based on the construction principle of the RC30. The rear wheel ran in a cast single-sided swing arm. The wheel itself was held in place by four screws.

The rear brake caliper was mounted on the swing arm. The double-piston floating caliper brakes, which have already been tried and tested, were also used. The brake discs were rigidly attached. There is no anti-dive system on the telescopic fork. An improved lever deflection increased the spring travel on the rear wheel to 130 mm.

Further changes to the model concerned individual details. The seating position was made more comfortable and the exhaust, which can be folded away with a ball joint, made it easier to remove and install the rear wheel.

In the year of its launch, the VFR 750 F cost around DM 15,570. With the RC 36 / I model, too, provided that it was well cared for, mileage of over 100,000 kilometers was not uncommon.

1994–1997: RC 36 / II

VFR 750 F RC36 / II side view

In 1994 the VFR 750 F was fundamentally redesigned. The trim and shape of the headlights were based on the Honda NR 750 oval piston machine . The most important result of the changes was the weight reduction of 10 kg. The cockpit got a printed circuit board, which made wiring of the individual instruments unnecessary.

The carburetors received flat slide valves and the exhaust system did not have a collector. For this, the silencer has been made more voluminous.

The light alloy wheels have also been lightened, and the rear rim has been made half an inch narrower. The brake discs on the front wheel were now floating.

In 1998 the VFR 750 F was replaced by the VFR 800 FI with 781 cm³ and injection.

Technical specifications

RC 24 / I RC 24 / II RC 36 / I RC 36 / II
1985-1987 1988-1989 1990-1993 1994-1997
engine
Water-cooled four-cylinder, four-stroke, 90-degree V engine
Crankshaft transverse
two overhead, gear-driven camshafts ( DOHC ) per cylinder bank
four rocker arm operated valves per cylinder four rocker arm operated valves per cylinder four valves per cylinder operated by bucket tappets four valves per cylinder operated by bucket tappets
Wet sump lubrication, oil cooler
Bore × stroke: 70 × 48.6 mm
Displacement: 748 cm³
Compression ratio: 10.5: 1 Compression ratio: 11.0: 1 Compression ratio: 11.0: 1
Rated output 100 PS (74 kW) at 10500 rpm (open 105 PS) Rated output 100 PS (74 kW) at 10500 rpm (open 105 PS) Rated output 100 PS (74 kW) at 10,000 rpm Rated output: 98 hp (72 kW) at 10,000 rpm
Max. Torque: 70.5 Nm at 8500 rpm Max. Torque: 74 Nm at 9000 rpm Max. Torque: 73 Nm at 9500 rpm Max. Torque: 73 Nm at 8000 rpm
Mixture preparation
Keihin constant pressure carburetor VDBOB ø 31.6 mm Keihin constant pressure carburetor VDJOA ø 34 mm Keihin constant pressure downdraft carburetor VDJ6A ø 34.1 mm Keihin constant pressure flat slide carburetor VD35B ø 34 mm
Electrical system
Battery: 12 V / 12 Ah Battery: 12 V / 10 Ah
Three-phase alternator: 12 V / 350 watts Three-phase alternator: 12 V / 335 watts Three-phase alternator: 12 V / 374 watts Three-phase alternator: 12 V / 370 watts
Power transmission
hydraulically operated multi-plate oil bath clutch
Six-speed gearbox
landing gear
Bridge frame made of aluminum profiles
Steering head angle: 62.5 degrees Steering head angle: 64 degrees
Trail: 108 mm Trail: 108 mm Trail: 100 mm Trail: 99 mm
Telescopic fork with adjustable anti-dive and air support, standpipe ø 37 mm Telescopic fork with anti-dive and air support, standpipe ø 41 mm Telescopic fork with cartridge damper, standpipe ø 41 mm Telescopic fork with cartridge damper, standpipe ø 41 mm, with adjustable spring base
Two-arm swing arm made of light metal profiles Single-sided swing arm made of cast light metal
Central spring strut articulated via a lever system, with adjustable spring base Central spring strut articulated via a lever system, with adjustable spring base Central spring strut articulated via a lever system, with adjustable spring base and rebound damping
Suspension travel: front 140 mm, rear 115 mm Suspension travel: front 140 mm, rear 140 mm Suspension travel: front 130 mm, rear 130 mm
Wheels and brakes
Double disc brake at the front with double-piston brake calipers, brake discs ø 276 mm Double disc brake at the front with double-piston brake calipers, brake discs ø 296 mm Double disc brake at the front with double-piston brake calipers, brake discs ø 296 mm Double disc brake at the front with double-piston brake calipers, floating brake discs ø 296 mm
Rear disc brake with double piston caliper, brake discs ø 256 mm
Light alloy cast wheels: front 2.50 "× 16", rear 3.50 "× 18" Light alloy cast wheels: front 2.50 "× 17", rear 3.50 "× 17" Light alloy cast wheels: front 3.50 "× 17", rear 5.50 "× 17" Light alloy cast wheels: front 3.50 "× 17", rear 5.00 "× 17"
Tire size: front 110/90 V 16, rear 130/80 V 18 Tire size: front 110/80 V 17, rear 140/80 V 17 Tire size: front 120/70 ZR 17, rear 170/60 ZR 17 Tire size: front 120/70 ZR 17, rear 170/60 ZR 17
Dimensions
Wheelbase: 1480 mm Wheelbase: 1470 mm
Length: 2175 mm Length: 2180 mm Length: 2100 mm
Width: 730 mm Width: 730 mm Width: 700 mm Width: 720 mm
Height: 1170 mm Height: 1185 mm Height: 1185 mm
Ground clearance: 135 mm Ground clearance: 130 mm
Weights and filling quantities
Weight with a full tank: 222 kg Weight with a full tank: 226 kg Weight with a full tank: 244 kg Weight with a full tank: 236 kg
Permissible total weight: 402 kg Permissible total weight: 406 kg Permissible total weight: 429 kg Permissible total weight: 429 kg
Tank capacity: 20 l Tank capacity: 20 l Tank capacity: 19 l Tank capacity: 21 l
Performance
Top speed: 235 km / h Top speed: - Top speed: 239 km / h (according to letter) Top speed: 233 km / h
Acceleration 0-100 km / h: 3.6 sec. Acceleration 0-100 km / h: - Acceleration 0-100 km / h: * 3.7 sec. Acceleration 0-100 km / h: * 3.4 sec.
Pulling speed 60–140 km / h: - Pulling speed 60–140 km / h: - Pulling speed 60–140 km / h: * 10.7 sec. Pulling speed 60–140 km / h: * 12.4 sec.
* Source: motorradonline.de

literature

Individual evidence

  1. ↑ https://blogs.yahoo.co.jp/okatasi2004/10424483.html

Web links

Commons : Honda VFR750  - Collection of pictures, videos and audio files