Actually, this was the best one, in our CUB.

I have used many external exhaust systems, but for my SUPER CUB, which is one of my favorite cars, I bought a new OEM exhaust system and switched back to OEM.



OEMExhaust System Merit
(1) Quiet and no nuisance.
You don't have to worry so much about your neighbors in the morning or at night. 。 The good thing is that it is less likely to inconvenience others, especially when traveling, which sometimes means leaving early in the morning.

(2) No need to worry about vehicle inspections.
The sound of an external exhaust system may become loud after a few years, and it may not pass the vehicle inspection. 。 Of course, the OEM exhaust system may also be in such a state if it is used for a long time, but it clearly has a longer life than an external exhaust system. 。
The Merit is the one that is less likely to be too loud and get an NG when it comes time to pass inspection.


(3) Torque is thick. (The external exhaust system is basically thicker in diameter, and the Torque tends to be lost. 。 The thicker the sound, the larger the sound, and the better the design and parenthesis.
However, there are many external exhaust systems that do not have a thinner Torque these days. 。 However, it gradually deteriorates and the Torque can become thin little by little.
In fact, I have been using an external exhaust system for many years, and at first I did not feel Torque loss, but when I switched back to the OEM exhaust system, I felt Torque become more and more. 。
I knew that Torque was gradually slipping away.

OEMExhaust System Demerit

(1) The appearance is plain. You can't give it any individuality (laughs).
But Simple and Cool.

The OEM exhaust system is heavier than the external exhaust system because of the bulkhead structure inside the OEM exhaust system. Also, the fact that steel is used in many cases is one of the reasons for the increase in weight.

(3) Difficult to appeals to the surroundings. (4) Quiet sound makes it difficult to be noticed by others (leading to an accident).

There was this kind of Merit and Demerit, but my CUB (50 modified 88 Spec.) is quite SmallEngine Displacement Volume, so the benefit of OEMExhaust System seemed to be considerable.


good point
◎Carburetor settings are set up so that the same settings can be used throughout the year.
I used the CUB70 factory carburetor setting (Main78 Throw40) as a reference. I really thought it would be better to set it to 90, but I thought it would be more compatible with 70OEM since Cranksha?Head and other parts were used from 50. This seems to have been a good choice.

◎Hill climbing performance has been improved:the car climbs hills that had been dropped to 2nd gear, while still having room to accelerate in 3rd gear.

◎Quiet. This is all there is to it. No one around you will notice you, let alone the police.

◎Durability is without a doubt.


In my case, carburetor PC20, high camshaft, bore up, and external exhaust system were the better specs, but the result of setting with OEM exhaust system was really easy to drive (laugh).
The 50OEMExhaust System is often derided as being clogged with feces, but it may be the best exhaust system to make the most of the Torque.

Some of my other vehicles have external exhaust systems, and they have many good points such as weight saving and high RPM extension.
But OEM is also great, because in a way it is a car model Exclusive Design.
It is understandable that some people, even those who are circuit enthusiasts, are concerned about Torque loss and choose to keep the OEM Exhaust System.

NormalBalance is the best, but this is not surprising. NormalBalance is the best, but this is not surprising, since it is built to the specifications of the Normal engine to begin with. 。 It is a TuningExhaust System, which means that it has to be versatile in terms of power characteristics and durability, so it is inevitable that the power may be a little low or heavy. View detail