Yamaha FZR 600 (3U)

from Wikipedia, the free encyclopedia
FZR 600 3HE with shortened rear

The FZR 600 (3HE) (1989–1993) is a motorcycle model from the Japanese motorcycle manufacturer Yamaha and is one of the supersport motorcycles.

There are three different models, the 3HE, the 3RG and the 3RH. The only difference between the models is the factory setting (throttle and engine control module), which determines the engine power. The 3U model has a maximum of 67 kW (91 PS) and approx. 68 Nm torque at 10,500 rpm. The 3RG model, on the other hand, has an output of 36 kW (50 PS). From 1994 there was the successor FZR 600 R (4JH) , which was built until 1995. Technically, however, the 3HE and 4JH don't have much in common.

engine

The engine of the machine is a water-cooled four-stroke four-cylinder in-line engine with 599 cm³ cubic capacity (59.0 × 54.8 mm bore) and two overhead camshafts (dohc), the 16 valves via bucket tappets with underlying valve setting plates (shims) actuate. The mixture is prepared by a Mikuni BDST32 carburetor bank. Spark plugs of the type NGK CR9E are used as standard. The engine oil (wet sump lubrication system) on models up to 1991 is cooled by an external cooler. In contrast to the actively cooled water radiator, it has no fan unit, it is only cooled passively. From year 91 the separate oil cooler was omitted and was replaced by an oil filter base through which cooling water flows.

transmission

All models listed above have a six-speed gearbox that was carried over from the previous 400 version, as well as an oil bath clutch. The standard translation is 15/45. With the 3HE you can reach a top speed of 230 km / h in 6th gear.

ignition

The Wasted Spark ignition works with a TCI (Transistor Charger Ignition) unit and two ignition coils. The firing order is 1-3-4-2. One ignition coil supplies the first and fourth cylinders, the other the second and third.

wheel and tires

Cast wheels measuring 17 inches in diameter / 3 inches wide at the front and 18 inches in diameter / 3.5 inches wide at the rear were fitted as standard . From 1991 onwards, a 4 inch wide rim was used at the rear.

The standard tire for the front rim is a 110 Bridgestone GS touring tire. The standard tire for the rear rim is a 130 Bridgestone GS touring tire. A 150 or 160 wide tire (only with the 4 inch rim from 1991) can be fitted as the rear tire. Appropriate approvals and parts certificates are available for this.

Weak points and possible optimizations

The FZR 600 is a solidly designed and built motorcycle that is still a lot of fun today. Only the inadequate chassis design, the transmission adopted from the FZR 400, the standard charge regulator and the limited tire selection for the 89/90 models spoil the positive overall impression.

landing gear

The standard fork is characterized by a questionable response behavior and early bottoming out. A limited remedy is to replace the fork springs in connection with the adjustment of the damping behavior through experiments with the fork oil viscosity. Nevertheless, the relatively thin and non-adjustable fork remains a weak point. The same applies to the rear shock absorber. An improvement can be achieved either by using quite expensive accessory struts or by installing the strut from a Yamaha Fazer RJ02. The dimensions of the Fazer's shock absorber correspond to the original component, but it is characterized by a different spring rate and slightly better damping. This modification must be entered in the vehicle documents.

transmission

The transmission adopted from the FZR 400 shows that the power of the engine is overwhelming, especially in second gear. The result is premature wear, unclean gear changes in the lower gears and audible transmission singing. There is no remedy - simply avoiding high revs in the lower gears increases life expectancy.

Charge regulator

The standard component is undersized and a hazard for the entire vehicle electrical system. Particularly high speeds cause extreme temperatures and failure of the controller. The consequences are defective batteries and, in the worst case, the failure of expensive components such as the CDI due to overvoltage damage. This can be remedied easily and inexpensively by using reinforced regulators / rectifiers, for example from the FZR 600 4JH or from the accessories trade.

Tire combinations

The selection of contemporary rear tires on the 1989/1990 models is very limited due to the unusual 3.5x18 inch rim and the limited space due to the brake anchor strut. The tire combination currently available (May 2014) is actually only the pairing of Bridgestone BT16 F (Pro), or S20 F on the front with a BT12 SS in 150/70 18. From year of construction 1991 a 4 inch wide rim in Used in conjunction with a slightly wider and stiffer Deltabox swingarm. Due to the increased installation space, this enables the installation of a large number of current tire combinations.

Modifications

The standard rubber brake lines should be replaced every 4 to 5 years at the latest. As with all motorcycles, it makes sense to use this opportunity to convert to steel braided lines.

A conversion to a relaxed seating position is easily possible using superbike conversion kits. Alternatively, the upper triple clamp from an XJ-600 Diversion can be used in conjunction with a corresponding tubular handlebar. If the handlebars are not too high and wide, no changes to the cables and brake lines are necessary.

Web links

swell