The world’s easiest tune up tool by Richard Cook
Jim first told us about folks in China using a spoke to make a quick tune up tool. I didn’t have a spoke since I found out that broken spokes make good welding rod, but I did have a little piece of threaded rod from some forgotten project.
The rod was just a press fit into a plug top which I always have a few of around, one hammer tap and it’s in. In order to fit the plug wire cap on a CJ it took a minute of filing the rod smaller but still leaving threads to catch the cap clips.
You just screw the cap on the rod on to the plug threads and clip the top on. Start the bike and warm it up and then short one side with an insulated screwdriver like so. That side goes dead and you can then set the other side to run slowly if you like as flathead guys do.
I want more idle speed in my OHV so I set each side to 750 RPM by my tach. I reckon most of the oiling is slinging so I want it to sling at about 1,000 RPM when I’m stuck in traffic here on a hot day.
After I’ve set both sides I lower them identically to get the exact idle I want. Notice the little notch in the throttle grip, and perhaps you can see a tiny mark scribed next to it. I put my finger on the carb slide and turn the throttle, when the notch meets the scribe is the exact point I want the slide to lift.
A CJ will run pretty good just tuned like this and my Unisync says it gets quite close.

Every now and then you make something so easy and handy that it is a real pleasure, the cost wasn’t too bad either.