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Z1300 Muzzy Fan Modification - Accel Coils
Info provided by Mejing, San Antonio, Texas sunvsat@sbcglobal.net
First the installation of the Accel coils. When I first looked at the mess that was under the tank, I thought it wasn't going to be easy to install the Accel coils. I checked the KZ1300.com site and saw the pictures from Dave on his install. After looking further, I found that one of the problems was that there was no air flow to dissipate the heat, not only from the coils, but from the engine too. It is just too cramped and these bikes are known for the heat they put out so I had to think of a better way to keep everything under the tank cooler and in turn keep the tank cooler. I checked the temp of it stock with stock coils, (I used an instant digital thermometer) I then removed the coils from their little nest and removed the ballast resistor. I left them lying on the top of the engine, and took another temp reading. Already it had dropped 45 degrees with nothing but moving the coils from their perch. More airflow was the reason. I am only talking about the air from the fan as it was still running on the center stand for all tests.
I looked at the possibilities and found the two outer coils could be mounted under the same mount with the same mounting holes, just under instead of on top. The left coil mounts a little ahead of the right coil as they are on top and the center coil mounts in the same location. Of course the ballast resistor is eliminated now with the Accel items, looking at the pics you see that the left side is now pretty empty . I started the bike, got it back up to regular temp and took another reading. It was 38 degrees cooler than with the stock components but hotter than with the components completely removed from the space. There was less airflow. I placed an aluminum plate under the lower coils above the cam towers and left the front of those plates far enough back so that the air from the fan would blow over them and through the now semi empty spot where the coils once were. Success, the temp was now 68 degrees cooler and I have had these mounted like this for over a year and I live in San Antonio, Texas where summer temps are in the 100's. I guess it works.
Muzzy Fan Install
Before starting on this mod, please be
informed that I have heard all the pros and cons about using a different fan
blade and why it only has a four blade fan. I also know that all the newer
high performance engines from any manufacturer, now have multi bladed fans and
the motor in the KZ1300 is more than powerful enough to spin a better blade.
As to the arguments about why the blade was so wide and thick, remember what
year it was and that they wanted the blade very rigid. Later years and
after lots more research, they found that the shape of the blade and the
incidence of attack to the air was more important and made far more efficient
blade shapes and sizes and in fact quieter.
To modify the KZ1300 fan motor to accept the much better Muzzy fan
blade, the following is what I did and it works perfectly. First the Fan
and motor must be removed from the fan shroud which can be left on the bike.
Then the fan must be removed from the motor. Set the fan aside and start
with the motor modification. As you can see in picture one, the motor has
a flange with a lip on it on the front of the motor. This flange must be
removed, it can be done with a cutting wheel or a hacksaw...both work well.
You can see the motor already installed in the fan shroud with the flange
already cut off in picture 2. Make sure you paint the cut edges to
preclude any rust.
A small modification that was done to the motor was to
glue a piece of Gore-Tex material (I took a 1/2 in circle from one of my glove
insides) and glued it over the vent hole above the main motor shaft. This
will stop any direct water from getting in. By the way, if you check your
motor, you will find it slightly rusty inside due to water entering the motor,
but it does have a drain hole at the bottom for the water to get out. For
those that don't know, this motor was made for this application and a little
water won't harm it. (you have to think, why they would have a hole that
water can enter and a drain hole for it to get out) It is actually vented
because of the type of motor it is and because of the heat it puts out which
dries any water that enters and it gets out thru the vents.
Just so you know, I rode with this mod in Oregon where the rain
never stops and here in Texas where when it rains, it pours with no problems.
The Gore-Tex is for those that think a little water will damage something.
(remember I said to check your motor with the rust inside...Hmmmmm it still
runs). OK, now to the fan mod and install. Take the KZ1300 fan and
cut from the outside of the hub to the center in three or four spots, picture 3
shows how I did it. You can now remove the aluminum center which was part
of the fan. Picture 4. Take the aluminum center and hold it from the
side, you will see a raised portion which is on the back of the part which is
toward the motor. Take a hacksaw and cut that portion off, be careful as
this is the part you need, the rest can now be a hamster toy. Picture 5.
It will look like a washer but the hole will fit the center shaft (the shaft has
a flat spot on it) as a washer would but better because it turns with the new
fan as it did when it was stock. This is an important step, I tried a flat
washer and it started squealing shortly after installation so use the part from
the fan.
Any way, now take the Muzzy fan with
the RS printed side towards the radiator (don't mess this up, or it will blow
with much less efficiency if you do) and put the stock washer and nut and
tighten. Picture 6. Before you do mod, place your hand next to your
cylinder head with the stock fan on and feel the airflow, after the mod, do the
same...you will be impressed. Works great, lasts a long time.
Remember to burp your radiator when you refill and enjoy your cooler running
KZ1300.
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Q: Do you know the correct part number for this Muzzy fan shown here? Robert B.
A: One guy in the Discussion Group said he used a motor and fan blade from a Kawasaki ZX10 on his 1300.
A: On my links page it states:
muzzys.com/fans.cfm
HT-H8, All models Kawasaki 1300 Aluminum fan blade, $35.95
If you go to Muzzy's site at the link above they say "all models Kawasaki 1300 - except KZ1300". They say that because as this tech article makes plain, the part is not a direct bolt on! You must make the minor modification as shown or it won't fit.
NOTE: On these newer browsers I've noticed that they don't always display my large images in full size when you open an image from the thumbnails. Once you click the thumbnail and open the larger image, if you 'mouse over' the image you should see a " + " symbol or some other indicator like a box with arrows usually on the bottom right edge of the image. If you click on the indicator, then the image will expand to it's full size which displays full screen on computers that use a 800 x 600 resolution setting for the monitor. If you click the indicator again it will go back to the smaller image. Some people use a resolution setting of 1024 x 768 or higher on their monitors and for those users the images will appear smaller than full screen in size. You can change your monitor settings easily enough if you desire. Also, the indicator I've noticed is slow to appear even after the image appears to of completely loaded. The indicator in Netscape seems to be a lot faster to display than the one in Internet Explorer.
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