(12-09-2019, 07:48 PM)Alan Wrote: You should be able to feel approx where TDc is against the compression when the plugs are in or your thumb over the hole with plugs out. This will give you some confidence that the flywheel is marked correctly. I’m wondering if the timing is 180deg out. If you swap the middle two leads over and it starts and runs on two you’ll know it is.Alan,
Having just rebuilt my engine I needed to set the ignition timing, rather than use the thumb over No. 1 plug hole I used a piece of 15mm. Copper pipe with a rubber glove taped over it. The glove is pulled over all the pipe except 1/2” at the lower end then taped tightly to seal it.The pipe then fits in the plug hole and when TDC reached on the compression stroke it inflates to show it is the correct position for timing the engine. If you cut off a finger ✂️(from the glove) and use that instead it is much more sensitive as it fills more quickly. I found this much easier than reaching round with a thumb.
Roger
Location:- Haverfordwest, Pembrokeshire.