Average Reviews:
(More customer reviews)My exhaust gas temperatures exceeded the O2 sensor rating under heavy load, so I decided to purchase this heat sink. The product has a hole in the side of the cylinder that extends into the exhaust. This hole must be facing the exhaust port when installed. There is an index mark on the "nut" to accomplish this. The problem is: What do you do if the index mark doesn't line up correctly after installation? No shims were provided to achieve proper alignmnet. One thick brass washer was provided. Forget your local hardware store for metric shims. I ordered aircraft copper crush washers from a website that recommended them for their 18 mm spark plugs for antique Harleys. Replacing the existing washer with one crush washer did the trick.
The product works as a heat sink and I found no affect on AFR readings, with or without the heat sink installed. If it wasn't for the installation problem, I would have rated it higher.
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