Where is Thermostat Housing on 454 Mag MPI GenVI
#11
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Pulled riser and elbows. Risers and manifolds look like new inside except for end. Pix attached. Everything is sitting in Barnacle Buster 20% solution to clean up. Noticed soot on the inside. Any ideas on what causes soot buildup inside riser/manifold. Good gaskets were used too. Sigh of relief when I saw the condition of the manifolds and risers since I thought I would need new ones. Rusted up thermostat may have been the culprit bit will see what happens when I put it back together.
![](https://cimg5.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_181314_0fccbaae4225c2fbb724b12e727e6349a7f460e0.jpg)
![](https://cimg6.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_181607_9e637bcf304ff1c5377541fe2a304e6b9de0f33d.jpg)
![](https://cimg7.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_185820_ece299cb073cb89af4da60a24b1004813c9bdfef.jpg)
![](https://cimg5.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_181314_0fccbaae4225c2fbb724b12e727e6349a7f460e0.jpg)
![](https://cimg6.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_181607_9e637bcf304ff1c5377541fe2a304e6b9de0f33d.jpg)
![](https://cimg7.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20200425_185820_ece299cb073cb89af4da60a24b1004813c9bdfef.jpg)
#12
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Soot is from running a bit rich. Pic doesn't show how bad just that its black. The plugs tell the real story, if its a couple or all of them
#13
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I pulled plugs earlier to lube cylinders. Noticed they werent original spec but may be used. I ordered the correct ones amd will be installing. They didnt look too bad.
#14
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Not bad but are rich, and not having correct plugs can cause it among other things. There is a nice color chart in the link
https://motorizedbicyclebuilder.com/...ur-spark-plug/
https://motorizedbicyclebuilder.com/...ur-spark-plug/