Speed limiter Magna Fifty
A few thoughts and actions regarding the speed limiter installed on almost all Honda motorcycles.
To begin with, I wanted to figure out whether the speed limiter in Russia makes sense from the side of the law, for this we recall paragraph 1.2 of the SDA of the Russian Federation, and more specifically the definition: A moped is a two- or three-wheeled vehicle driven by an engine with a working volume of not more than 50 cubic meters. cm and having a maximum design speed of not more than 50 km / h. Bicycles with outboard motors, mokikis and other vehicles with similar characteristics are equated to mopeds.
Great, the Honda Magna Fifty has a displacement of 50cc. cm, but the maximum speed of movement that can be developed without removing the limiter is 60 km / h. But there is one caveat, the tyrchik will not be registered with the traffic police, therefore category A does not shine for him.
Now consider the performance of a moped with a limiter installed:
- Driving in a straight line (without descents and ascents – a sort of spherical horse in a vacuum) – acceleration will continue exactly until the speedometer needle reaches 60 km / h, therefore it is better to stay in the right lane, because motorists try to drive at least at maximum the mark of the permitted speed + 20 km / h, since the driver of the tyrchik begins to interfere with traffic;
- Riding uphill – acceleration will immediately be replaced by deceleration, and if the speed was 60 km / h (for example, after descending), then it will almost immediately drop to 50 km / h, unfortunately they will not be able to squeeze out more than 50 cubes. It makes no sense to talk about an obstacle to movement here;
- Riding from a hill is an amazing acceleration to the maximum speed, and then it’s just a shame, on some hills it’s easier to squeeze the clutch and pick up speed by coasting, it’s quite possible to reach 65 km / h in this way, but such hills don’t come across often.
Now consider this issue from a security point of view. The weight of a tyrchik without a driver is about 90-100 kg, respectively, at speeds of 80-90 km / h it should simply be blown off the road, according to the site https://magna50.jakou.com/ (we use Google translator and smile :)) maximum speed without limiter 92 km/h. However, driving with a limiter is only safe when driving in traffic jams or country roads, since in other cases you have to vomit at a speed that is often less than 2 times less than the flow rate.
Removing the limiter increases the maximum speed by at least 15 km/h, which allows you to drive almost at the speed of traffic and improves road safety.
Having made this conclusion, I decided to analyze the operation of the speed limiter and consider options for temporarily or permanently turning it off.
So what is the principle? I noticed that the limiter suppresses exactly the engine speed, and in a barbaric way: when the maximum allowable speed is reached, the control unit starts to create misfires in the ignition, thereby keeping the speed at the level. From here, detonations, firing from the silencer and other bad things that result from the release of unburned fuel mixture into the silencer can appear. It is also worth noting that the speed limit only occurs when the bike is moving in 4th gear. Therefore, somewhere in the box there is a contact switch for turning on the fourth gear.
I surveyed my bike and made a brief photo instruction on how to remove the speed limiter.
Photo instructions for removing the limiter on the Honda Magna Fifty
First, remove the left decorative cover by unscrewing one screw:
We see 3 connectors: the 1st – 1 pin is the crankshaft angle sensor, the 2nd – 3 pins is the connector from the generator, the 3rd – 2 pins is the first and fourth gear sensor.
The tester needs to measure which of the wires is responsible for indicating the inclusion of the first gear and the fourth. To do this, it is enough to press the negative probe of the tester to any non-insulated nut on the engine, and poke the positive probe into the end of the connector, alternately switching gears in the box. I had a pink wire for the indication of the inclusion of 4 gears. We open the connector, we are interested in the part that is connected to the gearbox. Now it is enough to take a watch flat screwdriver, insert it into the end of the connector from the side of the wire, press the locking tab of the terminal and pull out the wire with the terminal.
Next, we isolate the terminal with electrical tape and wind it to the second wire so that it does not hang out. Plugging in the connector. We put the lid in place. We enjoy the ride.
View from the left.
View from above.
Another notable feature was that if the user of Russia is not embarrassed by shipping from overseas, he can buy a magna of both the first, second, and third generations:
- For the first generation will have to lay out – 2500$;
- second – 3400$;
- third – 3700$.
And finally, a bike that has already traveled on the roads of the Russian Federation will cost 130 000 rubles and more.
Driving characteristics (dynamics, acceleration)
A sufficient number of horses under the tank of the motorcycle allows you to dynamically move off and confidently accelerate from the mark of 100 km / h.
According to the developer’s specifications, the maximum speed is 196 km/h. The owners note that at 160 km / h the wind is already beginning to blow, but the power reserve is felt, so 190 are quite possible. Therefore, a comfortable cruiser – 120 km/h.
Acceleration from standstill to 100 km / h – for. According to user reviews, if you do not forget that this is a cruiser, for which a sedate unhurried ride is considered more normal, the indicators are beyond praise.
According to the manufacturer’s documentation, consumption – 2.63 to 4.52 l per 100 kilometers. But this is Japanese data. Owners in the Russian Federation note that you can hardly see below 5 liters. And if you anneal, then that’s all 10 l.
The end result depends on the driving style. Buck in 13 l means mileage no more 200 km on one gas station.
|Model||Honda Magna 750 (1982-1986)||Honda Magna 750 (1987-1988)||Honda Magna 750 (1993-2003)|
|Motorcycle type||power cruiser (dragster)|
|Engine capacity||748 cc|
|engine’s type||4-cylinder, 4-stroke, V-shaped|
|Number of valves per cylinder||DOHC, 4 valves per cylinder|
|Fuel supply system||Keihin x4 carburetors 32mm||Keihin x4 carburetors 34mm|
|Max power||80.3 HP at 9500 rpm||77 HP at 9000 rpm (88 hp – American version)||77 HP at 9000 rpm|
|Torque||63-66 Nm at 7500 rpm|
|Transmission||6 speed||5 speed|
|type of drive||cardan||chain|
|Front tire size||110/90-18||100/90-19||120/80-17|
|Rear tire size||130/90-16||150/80-15|
|Front brakes||2 discs, 275mm, 2-piston calipers||1 disc, 315mm, 2-piston caliper|
|Front suspension||39mm anti-dive telescopic fork, 120mm travel||41 mm telescopic fork, 150 mm travel|
|Rear suspension||double shock absorber||double shock absorber (adjustable preload), stroke – 100 mm|
|Wheelbase||1539 mm||1660 mm||1650 mm|
|seat height||762 mm||706 mm||710 mm|
|Max Speed||195 km/h|
|Acceleration to 100 km/h||4.3 sec|
|Gas tank capacity||13 l||14 l|
|Motorcycle weight (curb)||236 kg||240 kg||244 kg|