Hi Deetzy, welcome to the forum. As a relatively newbie on here myself I'm sure you will find it a most friendly, informative and helpful place to spend time on.
I can really sypathise with you as I too found my first diesel, a commercially produced AM10 1cc, just impossible to start even with the readilly available correct fuel. By chance I met someone who was well versed with such and with his help and advice it soon burst into life at my hands. The problem was the size of propellor - a very light 7 x 4 nylon had been bought - fine for once bedded in and in a model but rather too light for that initial start and early runs. A larger wooden prop gave a better flywheel effect and once the correct setting was found it was off though the 'flick' had to be learnt too. To say I drove my mother to despair with the noise would be an understatement. I was just thirteen and that was some fifty four years ago. Since then I have operated and refurbed many small diesels over those years but only recently actually made engines from scratch. These have all been diesels and all are 5cc capacity - when they ran it was like that small AM10 all over again so I can well appreciate your disappointment in not being able to get yours to start.
I would like to add to 'Tomols' good advice but first, before you wear your arm to a standstill endlessly flicking (I would strongly advise against using any form of electrical starter - at such small size if the engine becomes flooded it is so easy to bend the conrod or do other internal damage) it is essential to be absolutely certain you have good fuel. I have often seen reference to using starting fluid as an alternative to ether in diesel fuel but have never tried it. However your proportion of kerosene to the 'ether' content is to me the wrong way round. As already said a good basic mix is 33:33:33 - not a great fuel for performance especially without an ignition improver (you are extremely unlikely to source amyl nitrite or nitrate these days) but it will work. Usually Iso Propyl Nitrate -IPN- is used as an ignition improver. To improve performance reduce the oil (22 - 25%) and ether (25 - 30%) and increase the kerosene. If you do not have fuel that you knowwill work then you truly could be flogging the proverbial dead horse - thinking your engine (or yourself) is at fault when it isn't.
Okay, if your fuel is correct and you have a reasonably sized propellor (preferably wooden) - 8 x 4 or a 9 x 4 cut down to 81/2 would be ideal - how about your engine. Being right handed, I would fit the prop at 'ten past eight' as it comes on to compression, less than this the prop tends to drop below horizontal making a steady 'straight through' flick difficult; higher, more toward the 'hour' you will not get the impetus through compression. Starting technique however is very much how you develop it into what suits you best but you do have to get the piston rapidly over the point of compression
The piston / liner fit in a diesel is much more critical than it perhaps needs to be in a glo(nitro) engine though we are talking very small tolerances between the two. If you lapped the bore did you lap the piston to it - ie in situ - to get an exact fit? The piston should start to feel springy against the compression as soon as it passes the exhaust port. If you squirt a small amount of fuel in it and turn the engine over very slowly against compression
you should, if anything appears to seep down the side of the piston see if there is any leakage. If it does to any extent the piston is probably too small or the liner /piston possibly out of round and you may not be able to attain the compression required for starting. Sometimes squirting a small slug of neat oil into the port will help give a slightly better seal though it has to be said this is rather a last gasp hope - Regretably if the compression is not there no amount of flicking or modifying the fuel content will help bring it into life. - If that is the case and you feel a new piston is required then do say before you go ahead as you may be able to 'reclaim' the old one.
Hope this adds a little more - and I truly hope you are successful in getting it to run - I know just how you will feel if you do Thm:
Regards - Ramon
