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I made my own .....there is enough info on the site above to do the same for yourself.

Well if you must hang on small details, yes, but just as difficult to set up.(which, as you can see was successful)...that being the point afterall. As far as I am aware there are very few, if any, successful "differential" engines that will actually run anyhow (well known). Pos in that they...

That's pretty much like chalk and cheese ........Atkinson are difficult to get set up correctly as I have done it successfully.

It may be firing well, (whatever that means) but all I see are two induction fully open at the same time, so your "wasted spark is up the creek without a paddle". As earlier requested, a photo showing the internal crankshaft thanks.......

Doesn't matter that he has that crank configuration, they're independant in all respects. A few degrees of overlap between exhaust and induction is not going to hurt anything, can make the engine feel funny when rotated otherwise. I'd like to see a photo a bit more top view showing the...

There is a method where one can do it in one cut, allbeit with the correct tool.

Never heard of 1/8" whitworth...???

There is a free version, that was why I posted the web page. There is always Fusion360......🥴

Subscriptions Pricing Page.

Centre punch around the edges of the valve seat, in the aluminium, perhaps 1mm from the edge of the seat, with the seat in place. Go all way around, perhaps a dozen or more locations.

Doesn't always happen....should use the "copy code" in Arduino and then paste in code tags.

Hi Roger, Your resume sounds very much the same as my mate from here in Aus. Some of his achievements here......... Model Engineer We are all very proud of our mate George. :)

Not really...most is simply bs.

If you have the module no. and teeth numbers, and the other required gear cutting equipment, not difficult. Other than that, one can get gears from places like Aliexpress at a quite reasonable price. Sometimes the latter will save some time......did it a couple of weeks ago on a single cylinder...

Typical "modern country" outlook......when I go there, I tend to admire their attitude, not poo poo it.

We just used a spare car wheel/tyre.

It is possible to have a stationary hall effect operate from a slotted metal disc if one mounts a magnet of correct polarity to the back side of the hall effect. The hall effect unit is most likely an open collector device so fairly simple to test with a multimeter set to read voltage. Video...

First thought comes to mind...more money than sense.

Google it .........

Cheat is to keep your eye open around scrap dealers for old whipper snippers. Many have reeds that can be used depending how you design the setup. Stripped one out just the other day, nice and "miniature" and in like-new condition, housing the lot.