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Discussion Starter · #1 · (Edited)
My K3 has no exhaust stinger and I could not find one for sale. Seems the 68-71s have an aftermarket option but not the K3-78, that I could find. so I decided to make my own but beef up the pipe size a bit, stock one looks so small to me.

first I used about 3in of 15/16“ OD .120 wall DOM tube to go into the muffler. I then used a 3/4in section of 1-1/8“ OD .065 wall DOM tube to act as a spacer and stop. To that I welded the 6in section of 1-1/4 OD pipe that makes up the actual exhaust pipe. I then tapped a 5mm hole to use the stock mounting process. Here is a picture uninstalled and then installed. i made two sections for the end. One was straight and the one I decided to go with was the turn down slash cut. Adds a little something different to the look of the exhaust. I will be painting it black with high temp paint to match the muffler when I repaint that.

Untitled by Victor M, on Flickr

Untitled by Victor M, on Flickr
 

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Really nice!
On my 84, when it was my dirt beater, I removed the stinger hoping for a bit more performance over my friends. I made an extension out of copper piping that worked a treat...but no where near as well crafted as yours. Well done.


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Discussion Starter · #4 ·
Thanks guys! hopefully I can fire up the bike tomorrow and hear how it sounds. Cooper, I’m not sure how much if any performance it will add. I have never seen a stock pipe so I am not sure how the gasses make it into the pipe. This should flow easier though.

it was a fun project, I picked up welding a few years ago so i am always looking for an excuse to break out the welder.
 

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Who knows but I was young and looking for any advantage I could get as we thrashed around several backyard track.

The stock stinger is pretty intrusive BUT it may not have hindered performance much.

I bought a cheapie aftermarket 125cc “monkey” style exhaust for my then 88cc motor and I did the same...but it was welded in place. When I finally got it out, I realized that it was. I thing compared to the stock type. I’m sure someone on here knows more about it but if you can get a bit more flow...why not right? Ha


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Discussion Starter · #8 ·
Thanks guys. Still can’t hear it because I am having trouble getting the bike to fire. Post up results after I fix that.
 

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Discussion Starter · #9 ·
i have been able to ride it around some as I work on tuning the carb. I am very happy with how it sounds. I have never heard a stock Z50 but I like the tone.
 

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As it would happen, I recently removed and modified my stinger on my 96. Took pix and remember this thread so figured I’d post for reference.

I cut it off and the 2 pix are what the inside of the stinger, looking back into the exhaust and what the tailpipe inners looks like...after I ran a few drills through to open up.




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Discussion Starter · #11 ·
Thanks for adding it. I like how mine sounds with the stinger I made. Obviously never heard it with a stock one in place. Has a nice tone to my ear.

Between this and my K&N filter my carb needed the #60 jet.
 
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