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You have described the classic symptoms of an under-compressed glow engine, i.e. stops when plug disconnected and unwilling to 2-stroke. Try skimming the head 0

Can I ask what was wrong with the original piston/liner set? Only running will wear it out, not sitting in a box. I doubt that it's clapped out sufficient to stop it running or pulling a combat model round at 75mph. The process of enlarging a cast iron piston is often called "cherry bombing"...

Those things are no use for the tolerances applicable to pistons and liners. To have any hope of measuring taper accurately you need a bore gauge. However, that's not necessary provided you follow Ken's advice and lap the liner and the piston using the techniques described on Ron's site. I...

After you mentioned it in your last post I watched your video (not sure why I didn't see it before). The motor appears to be oscillating not fully rotating. I've not seen this on a glow before but in a diesel it is caused either by too high compression ratio or too much fuel causing too much...

If you suspect the piston seal (it should hold compression for several seconds when held at the top of stroke) and if the piston is made of cast iron you can make it fit more tightly by "cherry bombing". First expand the piston by heating with a gas torch until it is glowing bright red then...

I'm sorry to hear that you have no success but it must be fixable, just have to find the cause. For example, I have recently completed an Atom Minor. Initially it wouldn't start without an electric starter, the symptoms were exactly as you describe. I suspected the piston fit which was rather...

The motor sounds good and I'm sure is ready to run. However, 8.3:1 is low and may well be the problem whatever the designer says. Don't forget that the teflon and aluminium washers are both reducing the compression ratio. We are talking tenths of a mm here. No need for a new head, just put...

Hi c_mario and forum, I haven't posted before. Apologies if I have contravened forum etiquette by posting here first. I see you have re-made most of the motor without success and it occurred to me the one thing you haven't tried changing is the compression ratio. I have done a few Nelson head...