JIMS Machining Exhaust Seal Installer Tool - Tool Time

You wouldn't think that a simple task like installing an exhaust gasket on a Harley-Davidson engine would require a special tool. After all, the gaskets are just circular rings that you push into the exhaust port before bolting up the header pipe, which compresses the gasket to provide a tight seal between pipe and head.

JIMS Exhaust Seal Installer Tool

Or at least you hope so. The problem is that you can't be sure how well the gasket has seated. Sometimes, wiggling the pipe around to work it into place while sliding its mounting flange over the two studs in the head can dislodge the gasket enough to result in an exhaust leak or even cause part of the gasket to protrude into the port opening, partially restricting the flow of exhaust gases.

But not if you use the Exhaust Seal Installer Tool (part #788; $43.65) from JIMS Machining (www.jimsusa.com). It's a billet aluminum replica of the header flange, with machined protrusions front and rear that match the inside diameter of the gaskets. You first fit the gasket onto the tool, then slide the tool over the studs and use the two exhaust nuts to draw the tool in until it bottoms out on the head. Removal of the nuts and the tool leaves the gasket seated perfectly in the port.

Harleys use two different styles of exhaust gaskets—one that's flat and another that is tapered—and the JIMS tool installs both. The front side (with the JIMS logo) is designed for the flat gaskets, and the rear side, which is stepped, is for the tapered style. The tool also works on all 1984-2010 Evolution Big Twin, Twin Cam and XL models.

For some people, the cost of this tool would be too much for something they might only use once. But for the countless H-D riders who swap pipes often, whether on their own bikes or those of their riding buddies, this little tool is well worth the 40-plus bucks.