GK76 downpipe removal, repair and paint

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tailongwan
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GK76 downpipe removal, repair and paint

Post by tailongwan » Sat Apr 17, 2021 2:40 pm

Hi all,

Sharing new content today, related to the downpipe. The objective is to change the gaskets and paint with high temperature paint since it is in good conditions:
http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

I needed to remove the radiator (and drain the coolant of course, but I had also to test and replace the water temp sensor, so it's cool ;) ), and use a long 6mm allen wrench.
There is a bolt also under the engine (12mm hex bolt).

I sanded manually the downpipe so it is quite clean, not too much rust and no hole. I will go for painting when there is less wind outside ;)
After painting, i will heat as required by the high temperature with a heat gun to make the paint harden (this is what it is written on the spray bottle...)

But one question : I have a small piece of metal that went out of the pipe (output) and when i shake the downpipe, it rings the bells :? You can see the small piece of metal on the above pictures, and probably inside there are some other loose pieces.

Here is a picture on the inside of the ouput, we can see the baffle, seems in one piece, so it is probably deeper where things are going wrong...

http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

Has anybody already managed to remove / to cut this baffle ? I just want to avoid metal pieces dancing in the pipe :mrgreen:


Thanks all

tailongwan
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Re: GK76 downpipe removal, repair and paint

Post by tailongwan » Sat Apr 17, 2021 8:27 pm

After high temp resistant paint:
http://400cc.fr/wp-content/uploads/2021 ... 372565.jpg

Ready for heat gun tomorrow :+1:

Update: not working with heat gun, i need to find a kind of ceramic furnace to be able to put the whole downpipe @ 160°C... I will find this next week

tailongwan
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Re: GK76 downpipe removal, repair and paint

Post by tailongwan » Mon Apr 26, 2021 4:07 pm

Just some news from the downpipe: I put in the pottery kiln of my son pottery teacher :grin: :grin: (it looked like this https://kilns.pro/74-cubic-liters-top-l ... ble-1240c/) and it has been cooked during 60min @160deg ! I gave a tip to her and that's it! The color did not change, still mat black, I hope it will last long...

tailongwan
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Re: GK76 downpipe removal, repair and paint

Post by tailongwan » Sat May 01, 2021 5:43 pm

Picture after installation with new original gaskets (had to remove the radiator of course, so I cleaned everything before mounting). I kept the used allen bolts, 1 or 2 a bit rusty but threads are still very good condition.

http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

http://400cc.fr/wp-content/uploads/2021 ... scaled.jpg

cbr400rrn
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Re: GK76 downpipe removal, repair and paint

Post by cbr400rrn » Sat May 01, 2021 10:10 pm

Good job and that's a very clean looking engine. I'm impressed.


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