Wrapping/Insulating Headers on M8?
Unbelievably, it worked fantastic to lower the heat on the right side of the engine and it was super cheap.
The right side is now about the same temp as the left.
Note there are some potential downsides people like to "talk about", like your header eventually rusting, collecting moisture after rain/washes, and steam burning your friggin legs off etc, etc,
None of that has been an issue with mine so far. Still have my legs.
This is what I used:
Good luck. Wrapping it was not great fun. I took the header off and did it on a work bench. Wear arm/hand protection...
Edit: Also, my heat shields don't fit perfectly now, but it doesn't bother me. Be careful how much you wrap and where you put the metal straps to lessen the interference with the heat shields.
Last edited by lp; May 23, 2021 at 04:53 PM.
If its best to remove the headers form the bike, I'm guessing you need to replace the gaskets? Are the gaskets the same for all "big twin" motors? I saw these on Amazon that say they are good for all Harleys 84-21. Any trick to installing them, I saw a tool but its $50 so that seems a bit crazy. And is there a torque spec for the flange bolts?
If its best to remove the headers form the bike, I'm guessing you need to replace the gaskets? Are the gaskets the same for all "big twin" motors? I saw these on Amazon that say they are good for all Harleys 84-21. Any trick to installing them, I saw a tool but its $50 so that seems a bit crazy. And is there a torque spec for the flange bolts?
Yes, I wrapped over the collector and the cat some. I reused my exhaust gaskets, have several times, but Yes, they are pretty standard if you want to use new ones. Don't need a tool to install them...
Tip. Do two runs. For run one, start at the collector and work your way up to the front cylinder. Second run, start at the end of the cat and work you way up the cat, to the collector, then up to the rear cylinder in one shot.
If you do it this way instead of doing three individual runs (cat, cylinder 1, cylinder 2) you will be able to avoid having a bunch of metal tie wraps right at the collector - which makes it hard to get the heat shields back on...
Also, when you light off the bike finally it's going to smoke like crazy for awhile and smell bad for 100 miles or so. Normal.
Good luck!
Last edited by lp; Jun 12, 2021 at 10:12 AM.
When I go bigger cubes I'll use it.
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