Harley Davidson's speed

We're going to start assembling a seven speed package In a Harley Davidson,Especially a software model of double cam engine

Is it really necessary?
When I saw the kit, the first question I asked myself was, why do people need to take a step further on these engines, and since 2007 (dyna model, 2006), they have been equipped with a cruise drive series transmission of six speeds.

The initial six speeds are the evolution of the five previous rates, using propeller gears (with the propeller as the tooth, not the rectum) to meet increasingly stringent emission (noise) standards. The initial design defect was in 2006 and was later corrected. So far, it's been going pretty well. The box has a 1:1 final output rate, or "direct path," which means that at the speed of the last gear, the output shaft rotates one revolution at each input shaft. In order not to sound too technical, we can compare it to an "overdrive" box, where the output revolution is slower and smoother than the input revolution, but there is one less pair (remember the bicycle change). When you put a small and less pedaled foot, you're faster).
Although six speed transmission is very effective, the fact is that some owners miss out on greater "Agility" in terms of acceleration and speed increase, especially in enhanced or large cubicaje engines (103ci, 110ci, 127ci...), because in these engines, the "bump" of one rpm is converted into a single "bump". upstream. In addition, some speed and load also have certain ultrasonic, which is a feature, there is no problem.

For the seventh
The kit we're going to install is made by Beck drivetrain, a world leader in bicycle exchanges in the United States

The output rate of the software is similar to that of the original 6-speed box, i.e. 1:1 box. However, due to the addition of a gear, all the marches are shorter, so the acceleration, progress and flexibility are improved.
In addition to this advantage, Baker has also made a series of improvements, including the addition of transfer doors and widening of bearings.

1. Cut and uncut gears, ARP (used in Formula 1) converter and a converter, remove the old manual control system and spring system, and install a linear ball blocking system to make the change more flexible and accurate.

Coupled with a technology that automatically removes spindle mass to avoid inertia (plus embedded gears, plus HD axle is much heavier), the typical "clone" is almost completely eliminated throughout the driving process (I will miss him).
The toolkit is complete, direct and very simple to replace our 6-rate transmissions using only three of them.

disassemble
Before we start, we must know that in order to properly perform some of these procedures, we need special tools, six speed boxes, and at least, most importantly, our motorcycle operating manual.
According to the service manual, we cut off the battery, drained the transmission oil and primary oil, and then we will start to completely dismantle the primary transmission and plug it with special tools.

We also used a choke to remove the starting engine and drive pulley

We will continue to use specific tools to extract the trajectory of the clutch bearing.

From here, we can take out the clutch cover from the right side of the motorcycle, and then take out the screw from the transmission "door",

Then we can take out the transmission completely It's important to pull the component out of the door, rather than hitting the hub in the other direction, because we might destroy it.

We move the whole thing out and support it on a stable surface (very heavy), and from here we can start installing our new seven speed suite.

Main lane
Now, we just need to take out the main gear, so we withdraw the controller.

Then we use special tools to do this, which will push the gear out of its position.

We must bear in mind that this action will break the gear bearing and therefore must be replaced by a new gear.

Once the special tools are in use and have been in use, we will re install new bearings and new main or direct gears, which will deliver the seventh speed.

Get dressed!
Then, we will prepare the main gear assemblies of the gearbox to install them, remove the shipping flanges and lubricate the gears with transmission oil. Then, we loaded the goods into the conveyor boxes very carefully.

Once it is replaced, we can start to press and hold the gate with the ARP type screws in the toolbox, which will be carried out in the order and sequence recommended in the workshop manual.

We finished the installation
In reverse order, we are installing the top cover, the clutch cover and the clutch bearing.

And propulsion pulley.

At this point, we continue with the entire installation of the main transmission, escape, etc., until we have the bike ready to shoot again.

Calculator adjustment
It is important to know that due to the change of the transmission, we have changed the output ratio of the transmission, so the transmission cannot work accurately. Baker's people took this into account and included a device in the kit to make it easy for the calculator to adapt to the new specifications.

Road test
It is time to check that the installation is correct and to assess the benefits of the new exchange fund. After checking the oil level and driving through good gears, the engine stopped and the rear wheels were high, we towed the motorcycle onto the road.
Our test model is a Softal Screamin' Eagle with 110ci engine (1800cm3), with Thunderheader exhaust and TTS control unit with custom-made injection map and in previous tests with the original 6-speed transmission works quite well, although some aggressiveness is missed, since the change is a bit docile compared to the engine.
All this has changed after the installation of the DD7 kit, now the engine goes up more strongly, without losing any revolutions, and the torque "kick" is progressive, leaving us a tingling in the stomach as we accelerate.
Another change that surprised us is that practically the typical "clonk" has been removed when gearing the gears, now it does not go from "click", and the touch is absolutely precise and accurate. Noise from the gearbox at high speed has also decreased greatly.
The only "but" is that sometimes it's hard to know what gear we're driving on (you don't really need to know if you know your machine either), as you lose count. In our case we install to the test model a digital speedometer that tells us at all times the gear, including the 7th.

Conclusion
We therefore give an excellent note to this kit that will delight those who like to "sting" at traffic lights with sports bikes and also provides a very important change in softness and performance, which results in a big smile when you open gas.

Frank Burguera

#mecanicaharley