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I saw this thread after replying to your PM. The step-by-step building of it was documented on The Chopper Underground which no longer exists. The text is long gong but I do still have all the pictures on my web server. By the way, the clutch still functions smoothly and effortlessly. In all...

That's not exactly a strong selling point. It was the inconsistencies of the genuine Shell cams that necessitated seeking out an alternate source. I'm just a hobbyist trying to help out the XS community. Not trying to step on any toes. I'll go back and edit my previous post.

I measured one years ago to make a taper spacer/adapter. My notes say the hole in the spacer [that fits the crank] has a 2.25"/foot taper, 1" deep and 1" ID at the large end.

If you just want a regrind without a re-phase then you can save some money by cutting out the middle-man. Send your cam to Oregon Cam Grinding, http://www.oregoncamshaft.com/. If you want Shell#1 specs then ask for pattern #1906. I don't remember off hand the pattern number for the "256" grind...

Yep

Sound like you got it all covered. :thumbsup:

Which side of the engine are you looking at? The threaded end of the cam needs to be on the right side. It's possible to put the cam in backwards. You can line up the dots and it will run, but not well. Also, it appears that you have double-lip seals. Notice that the outer lip is just barely on...

For reassembly you can use shims to stop the parts moving so you don't overshoot due to the press frame springing. Measure the length of the rod pin and subtract it from the target cheek-to-cheek width. Divide that by 2 to find the necessary shim thickness. I'll add a couple thousandths because...

What alternator bracket are you using? The bracket I made was the same height as the Banshee bracket and would accommodate all the stators on the list. If you are using a Banshee bracket on an adapter plate then it will be too tall for most of the stators on the list. You can machine the...

Don't get your hopes up about using cylinder pressure feedback to adjust ignition timing. When you look at a snapshot of a single pressure cycle it looks like it would be fairly simple. See if you can find a chart that overlays ten consecutive cycles. It'll be all over the map and chances are...

I know a car with quenchy-wedge chambers like 50+ degrees advance when cruising so I wouldn't be surprised if our archaic hemi with dome pistons didn't want 60 degrees or more under light load. I started developing a digital ignition for the XS with the primary goal of incorporating a load...

If you want your links to last forever then buy a domain name and pay for web hosting. Keep a backup of everything on your own computer. If the web host tries anything funny, cancel it, upload everything to a new host and move the domain name over. Here's a pic I uploaded fourteen years ago.

It's funny you mention arc welders when asking this because that is the analogy I use to explain the role of the condenser in points ignitions. An arc welder is a constant current source, like an ignition coil. When arc welding, you touch the electrode to the work piece to start current flowing...

Simple load tester: Unplug the wire from the spark plug, plug in a second spark plug, hold the test plug against the plug in the engine and spin the motor over. The two plugs are in series, if it can't jump the gap inside the engine then you will see no spark in the external spark plug. This is...

You guys are WAY overthinking this with all the talk of formulas and flux. The ignition coil is an inductor which is the electrical equivalent of a flywheel. When current is low and you try to increase it, an inductor will increase resistance to the circuit to try and keep current low. When...

The "hot spots" you see on the tops of the side covers are just a reflection of the cylinders. A perfect example of the trouble aluminum poses to infrared measurement. The Oregon Museum of Science and Industry has some terrific hands-on exhibits. One of them that was a real eye opener was a...

It's funny you mention that because it is actually one of the reasons why I like kick starting my bike. I see everybody get out of work and get in their cars with a look of dread. They all want to be home but none of them are looking forward to the drive home. How many smiling faces do you see...

Aluminum is to infrared what a mirror is to visible light. Measuring the temperature of aluminum with an infrared thermometer is like taking a picture of a mirror. It's possible but problematic. Years ago, when I got my dyno going, I put thermocouples under the spark plugs on my bike to monitor...

So far it's looking that way. One of his carbs started pissing gas all over so we had to shut it down before I had a change to check it out thoroughly (timing, dwell and whatnot). We fired it up several times before that happened and it kicked to life easily each time.

When the spark comes before TDC the piston is pushing against a burning fuel mixture as it comes up on the compression stroke. The earlier the spark, the harder the piston has to push. An electric starter simply doesn't have enough power to overcome the burning fuel mixture when the timing is...