AS Uotani: A brand trusted by Japanese classic bikers

Story

Is your motorcycle's ignition system healthy?

Most classic motorcycles lose power significantly due to deterioration of the ignition system. It becomes difficult to start and the bike loses its punch in the low and medium speed ranges. One of the most essential systems in a motorcycle is its ignition system. In order for a motorcycle to run, its ignition system must function properly, and a variety of issues can occur if it doesn't work well.

So, if you are plagued by ignition problems or you want to avoid them in the future, high precision ignition system tuning is necessary.

Maximize the Potential

The three most important elements of a gasoline engine are "good mixture," "good compression," and "good spark". This "good spark" means a stronger spark, a larger flame center and optimal ignition timing, resulting in more power, more torque, better fuel economy and fewer misfires.

For this purpose, not only increasing the spark strength but also widening the plug gap is an effective means.

However, if the plug gap is widened, the required voltage will increase drastically, which may cause ignition loss or poor combustion in the case of a normal ignition coil.

What does AS Uotani do?

Let's first take a look at what the riders think. Below are some reviews of AS Uotani products from Webike customers.

"I was surprised to see the increased torque from the moment I started the engine. I felt that it become stronger throughout the power band. It also changed the response and sound when I opened the throttle. This is a great engine part."

from a SUZUKI GS1200SS owner

"I was able to ride the bike at full throttle and really feel the power of the SPII. First of all, the top speed was a blistering 260 km/h. I felt the power was stronger than when I was riding the early GSF1100. In my case, I set the rev limiter to free. I'm a person who often watches the tachometer. There is no jerkiness at low speeds, and the engine always seems to keep up with the throttle. I'm also thinking of choosing an ignition curve that suits my riding style and getting excited now."

from a SUZUKI GSF1200 owner

"I could clearly see the difference from the moment I started the engine. The idling became very stable. The response was better and it ran smoother even at RPMs where it used to labour."

from a YAMAHA SR400 owner

Challengers in the tuning market

As you can see from the above, AS Uotani are experts in the field of ignition tuning and have a good reputation with customers. They develop ignition systems, power coils, and replacement parts for motorcycles.

What I'd say is most attractive about AS Uotani is that their parts allow riders to trust their machines more. Personally, rather than powering up, the most exciting thing for me is to be able to bring out the full potential of a motorcycle, getting a different riding experience from the stock model.

AS Uotani is a challenger in the ignition system tuning market which mainly consists of overseas brands. Their parts are developed and produced in Japan, and they have accumulated a vast amount of original know-how, including the creation of original maps based on the analysis of stock ignition characteristics that differ from model to model, and transistor units that can immediately cut off a large current. They have produced bolt-on kits for a wide range of models, from discontinued bikes to the latest machines.

After analyzing the ignition characteristics of the stock igniter, a unique ignition map is created and set in the control unit. Since it is completely digitally controlled, the three-dimensional map corresponding to the advance angle, retard angle, and throttle position sensor can be set as desired. AS Uotani's largest strength is their ability to control the strong spark as desired.

Products

SPII FULL POWER KIT

･Torque is increased throughout the entire range, especially in the low to mid range that is often used when riding in the city.

･Specially designed for each model with the best ignition map designed using a chassis dynamo and actual road tests.

･The ignition map increases torque at low and mid speed and rev at high rpm while utilizing the characteristics of the stock engine.

･The control unit uses a high-capacity transistor to extract 100% of the energy from the high-power coil.

･The high performance microcomputer controls the optimum energizing time and ignition timing for each revolution.

･Five to ten different ignition maps (curves) can be set depending on riding style and degree of tuning.

･The rev limit can be set every 200 rpm with a switch.

SPII POWER COIL KIT

･Torque is increased throughout the entire range, especially in the low to mid range that is often used when riding in the city.

･The SPII high power coil generates 40,000V and 2~3 times more spark current than the stock coil, which improves starting performance and fuel efficiency.

･The SPII power amplifier brings out the full potential of the high power coil without placing a heavy workload on the stock igniter.

･When installed on point ignition vehicles, most of the current flows through the SPII power amplifier, contributing to a significant extension of the life of the points.

･Can be installed on the latest models as well as early models regardless of the resistance value of the stock ignition coil (CDI ignition bikes do not require a power amplifier, only the SPII high power coil can be installed).

･A connector, wiring harness, and plug cord joint set are included, allowing installation with minimal modification.

Choose the one you need

If you want to improve the performance of your ignition system but are not sure which kit you need for your motorcycle, here is a summary of three situations where you might use one of these kits.

-For changing the ignition timing

In addition to the powerful spark, the SPII Full Power Kit comes with a control unit that replaces the stock igniter. The ignition map can be changed and the rev limit can be set every 200 rpm. The SPII Full Power Kit is designed specifically for your bike, so you can install it easily.

-For classic bikes such as point/semi-transistor ignition systems

Classic bikes such as the KAWASAKI Z1 and HONDA CB750FOUR use mechanical ignition systems called point ignition systems. As it is, the degree of freedom of ignition timing setting is low, and it is difficult to obtain the ideal ignition map. By installing AS Uotani's SPII Full Power Kit, not only a powerful spark but also digital control of ignition is achieved. In addition, since the points are replaced by pickup coils, there is no need to worry about the maintenance and life of the points.

-For those who don't need to change the ignition map or want to use another manufacturer's CDI

The SPII Power Coil Kit does not come with a control unit. Instead, it comes with the SPII power amplifier. CDI ignition does not require a power amplifier because the current flowing through the coil is very low to begin with. This is a universal kit, but there are also kits for specific models for some vehicles. Also, for classic bikes that use point ignition, the life of the bike is greatly extended because the current flowing to the points is reduced.