Among the Japanese representatives of this type of vehicle such as a scooter, there are many leaders, and one of them is the Suzuki Sepia, which, despite its early start, is still very popular.
Let's start with history, and we can immediately note that the scooter is quite old, because the first version was released back in 1989. As then, in our time there are two types of this scooter model - Suzuki Sepia AF-50 and Suzuki Sepia ZZ. In any case, they have their differences, and the second of them, that is, the ZZ model received a more powerful and spirited engine. As a result, the characteristics of the scooter allowed it to reach speeds of up to 90 km per hour, which is very good for a 50cc Suzuki scooter , which other models produce up to 60 km per hour. But we still recommend buying a Suzuki Sepia af 50, because it is not so demanding on repairs and its engine does not require special maintenance, which cannot be said about the ZZ model.
In our review, we will try to touch on a newer scooter model, and it will be the Suzuki Sepia 2. First of all, you can make sure that the scooter is modern by looking at the photo. I myself am the owner of this scooter, so I will try to describe everything as clearly as possible.
Adjusting the Suzuki Sepia carburetor
Before the procedure, you should remember that when changing parts such as a cylinder, filters, muffler, the old carburetor settings will be invalid and you will have to make adjustments again. It is also extremely important to adjust the jets when the engine is already warm. The process is carried out as follows:
- Adjustment of needle and venturi tube size at 1/3 gas;
- Adjusting idle speed and mixture quality.
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Needle adjustment
The peculiarity of this carburetor is the absence of a jet for the quality of the mixture; its adjustment here occurs by raising or lowering the locking ring on the needle. If you notice that the mixture is too lean, you will have to install the ring higher by 1 or 2 grooves; accordingly, the mixture will be rich when installing the same ring on the 4th or 5th step. The center position on the 3rd groove indicates the standard throttle needle setting. If configured correctly, the scooter will have good traction, speed and consume fuel according to the specified characteristics.
Characteristics of Suzuki Sepia 2
Since I have such a model in my garage, I’ll start with the appearance, because this particular version of the scooter is different from many others. If you compare the new product with the older versions, you can see an excellent and thoughtful design, increased space in the form of a gasoline tank on top. By the way, it is the fuel tank compartment that increases the space for the second passenger, so that he can feel comfortable. The fuel tank itself has a volume of 3.7 liters. Because of this appearance, this model can easily be confused with the Honda Dio scooter. If we return to comfort, then in addition to the new, longer seat, the scooter has an excellent trunk volume in which you can put your helmet or, for example, a bucket of potatoes.
Setting the air screw
The carburetor also has a jet responsible for the amount of air located under the cover. The jet is located in the air channel, so when you tighten the screw, the throttle rises and the air flow increases. At the same time, the engine speed increases.
Configuration is carried out as follows:
- completely tighten the screw and unscrew it 4-5 turns;
- the engine should start to stall;
- gradually tighten the screw until the speed increases to maximum;
- upon reaching maximum speed, you can unscrew the screw ¼ turn;
- adjust the idle speed screw for optimal speed.
Suzuki Sepia scooter.
Instructions for design, maintenance and repair. >> Technical characteristics of "Legion-Avtodata"
Specifications
Curb weight - 69-70 kg Engine Type - 2-stroke, carburetor Number of cylinders - 1 Displacement - 49 cm Bore x piston stroke - 41.0 x 37.4 mm Compression ratio Sepia AF50 - 7.4 Sepia ZZAF50ZZ - 7 .6 Fuel consumption (at 30 km/h): Sepia AF50 - 1.5 l/100 km Sepia ZZAF50ZZ - 1.7 l/100 km Power Sepia AF50 - 6.8 hp at 7000 rpm Sepia ZZAF50ZZ - 7.0 hp. at 7000 rpm Torque Sepia AF50 - 7.1 Nm at 6500 rpm Sepia ZZAF50ZZ - 7.4 Nm at 6500 rpm distribution system - reed valve at the inlet Fuel tank capacity - 3.7 l Oil tank capacity - 0 .6 l Transmission oil volume - 0.09 l
External speed characteristics of the engine (AF50 CA1EA from 04.1989).
Air filter
. Air filter with oil-impregnated foam filter element.
Carburetor
Type 1 - Mikuni VM14SH Throttle diameter - 14 mm Main jet - No. 62.5 Air jet - 0.7 mm Idle jet - No. 17.5 Enrichment jet - No. 50 Enrichment air jet - 1.0 mm Idle speed - 1800 rpm /min
Type 2 - Mikuni VM14SH Throttle diameter - 14 mm Main jet - No. 60 Air jet - 0.7 mm Idle jet - No. 20 Enrichment jet - No. 25 Air enrichment jet - 1.1 mm Idle speed - 1800 rpm
A starter enricher is installed on the carburetor. When starting a cold engine, the enricher shut-off needle is retracted and the combustible mixture is enriched. After starting the engine, current from the generator flows to the heating element, the thermoelement heats up, its working fluid expands and the enrichment channel is closed.
To ensure stable operation of a cold engine, a heater is installed on the carburetor, which is turned on by a temperature sensor at a temperature of less than 6°C.
Scooter engine.
Intake and exhaust systems.
Cooling system
. Air cooling, forced. Air is forced by a fan to the cylinder cooling jacket.
Oil pump
. Oil pump with worm drive from the crankshaft.
Ignition system
. Contactless ignition system (CDI - “Condenser Discharge Ignition”). The scooter's two-stroke engine uses a flywheel-type ignition system from a Magdino, which simultaneously ensures the operation of the ignition system, lighting devices and charging of the battery. Magdino combines a magneto and an alternating current generator. It consists of a stationary stator on which windings, a capacitor and a breaker are installed; a rotating rotor on which magnets are attached. Flywheel-type Magdino allows you to avoid installing a flywheel, does not require the installation of an additional drive, and does not require additional installation of a generator.
1 - spark plug, 2 - battery, 3 - electricity consumers, 4 - rectifier, 5 - breaker, 6 - CD unit), 7 - magdino rotor, 8 - ignition winding, 9 - magdino.
Transmission diagram. 1 - V-belt, 2 - input shaft, 3 - intermediate shaft gear, 4 - intermediate shaft, 5 - output shaft (rear wheel axle), 6 - output shaft gear, 7 - fixed cheek of the driven shaft, 8 - clutch assembly, 9 — clutch drum, 10 — fixed cheek of the drive pulley.
Ignition timing ....18° to TDC (4000 rpm).
Starting system
. The starting system is combined. Under normal operating conditions, starting is carried out using an electric starter.
Attention:
To start with an electric starter, turn the ignition ON, press the brake and turn on the starter. If necessary, the engine is started using a kick starter.
Transmission
. The transmission is continuously variable, with a V-belt variator. The clutch is automatic centrifugal, combined with a driven pulley. The rear wheel is driven through a two-stage gearbox with spur gears. Gearbox gear ratio - 12.876 CVT gear ratio - 2.815-0.866
Variable speed drive
. The variator consists of a V-belt and two pulleys. The V-belt drive pulley consists of two conical surfaces - “pulley cheeks” with a gap (“groove”) between them. The drive pulley is connected to the crankshaft, the driven pulley (via a clutch) is connected to the rear wheel gearbox. The distance between the pulley cheeks can vary. On the drive pulley this is done using a variator clutch. The cheeks of the driven pulley are compressed by a spring. As the rotation speed increases, the variator clutch brings the cheeks of the drive pulley together, while the belt is squeezed from a position close to the center of the pulley to its periphery. Since the length of the belt is constant, its tension increases, and it pushes the cheeks of the driven pulley apart, moving towards the center of the pulley.
Carburetor operation diagram (type 1)
The gear ratio of a variator is the ratio of the radii along which the belt passes on the driven and driving pulleys. An increase in rotation speed causes a decrease in the gear ratio, which corresponds to the inclusion of higher gears in a manual transmission. The disadvantage of an automatic variator is that the gear ratio depends only on the rotation speed, without taking into account the load of the driven pulley. The coupling body is the movable cheek of the pulley. A guide plate, a bushing and a stationary pulley cheek are attached to the crankshaft.
The coupling body can move longitudinally relative to the shaft. Between the guide plate and the coupling body there are rollers that move along channels in the coupling body.
Carburetor operation diagram (type 2)
When the engine rotates, the rollers, under the action of centrifugal force, are displaced from the center of the coupling and wedged between its body and the guide plate.
As the rotation speed increases, the rollers diverge further from the center, the coupling body moves to the left (as the pulley moves, the cheeks of the pulley converge and the belt is forced out from the center of the pulley to its periphery.
Possible malfunctions of the coupling include wear of the rollers (as a result, the rollers become jammed and the pulley cheeks remain in a contracted position after releasing the gas), difficult movement of the movable cheek due to poor lubrication of the bushing.
Brake system Sepia AF50
. The front and rear brakes are drum brakes, operated by a cable from levers on the steering wheel.
Sepia ZZ AF50ZZ
. The rear brake is drum, driven by a cable from a handle on the steering wheel. The front brake is a hydraulic disc brake, the handle and master cylinder are located on the steering wheel.
Rear suspension
. The rear suspension is pendulum type with a monoshock absorber. The power unit block is used as a lever. Suspension travel is 59 mm.
Front suspension
. The front suspension is a conventional telescopic fork. Suspension travel is 65 mm.
Sepia ZZ AF50ZZ
. The front suspension is wishbone, with a shock absorber. Suspension travel is 58 mm.
1 — spring seat, 2 — spring, 3 — guide, 4 — bushing, 5 — boot, 6 — tip.
Wheels
. Tire size — 3.00-10-2PR Type — tubeless Rim — 10×2.15
Overall dimensions (CA1EA from 04.1989).
Overall dimensions (CA1EB from 03.1990).
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