what is happening to the plugs ?

is possible email me a picture of the glowplug coil as well as the top of the piston....

to answer your question the TKO bearings work very well, unfortunately tho they fit almost too tight onto the crankshaft..Which can make removal of the crank troublesome down the road.... I have seen a couple where the bearing almost seizes onto the crank and makes removing the crank without removing the bearing impossible...Now I have only seen this happen several times, but it is something to be aware of IMO...