let's see.... it dies when it's hot right? runs fine when it's cold?

pinch is gone if so.

sounds like it.

cdelong is correct.

The ninja plugs are tapered more than novarossi / O.S. glow plugs. That means when you use a different plug other than the ninja plug, you just opened up the button a little more than it was made for; possibly causing an airleak.

i noticed that the treads are different,
a sirio is about the same.
but the best plug is the ninja's,ya ya i know some ppl say umm well stuff but it really is true,the motor just runs better.

Thanks for all the info guys. I guess that we will have to try to get some Ninja plugs into our LHS. What # are you recomending? Its not that the pinch is gone because it will die even before it gets up to temp. It really doesnt matter if it is hot or cold, it just dies.

Is there any resistance at TDC when you remove the plug? Does it roll over easily with the plug in?

Is the piston dome tan, brown or sanded looking?

0.028" is 0.71mm, so the Novarossi combustion chamber depth is the same as the measurement from piston at TDC, to top of liner.
0.050" is 1.27mm!!!, which seems a lot of head clearance to me....
According to your statement, you even have a head clearance of atleast 0.72mm (1.27-0.55), without any shims installed.
Is this correct?

dosent this look tasty.....3 meets old

Shit dude, what the hell happened there ??

my guess some thing got sucked into the engine a bit of the sleeve is missing off the top of one of the ports to not happy a good thing is new P/S is cheap but still

A bit of the sleeve is missing?

Yeah but still, you don't need that kind of crap happening on it's 3rd meet!

I feel for you !!

My guess.
Your liner broke between the intake ports, this made the damage.....
The strange thing though, I've seen this before, but always on the exhaust side, not the intake......
Or is your liner still intact?

My idea goes thru the path that M7H suggested, but... wanted to teardown an R01 just to see where you got the damage.

Time for a complete teardown of the engine and a very scrupulous inspection of the bearings, my idea is that some kind of cr*p went thru the sleeve and got trapped by the smaller square boost ports you have at the front sides of the sleeve, disassemble completelly and inspect for damage on the port that runs over that area, much probably you'll find something.

Could be a small part of bearing, remove the main bearing and inspect it.

That hurts!. Look at the first photo and you could see what seems a hole thru the piston skirt... amazing.

More details about the carnage? Fuel? Operating temp...

that excatly what happend little bit of sleeve missing is right at the top of this port on the left side

fuel 25% oil 10% temp 110-115C*

no hole just a little deeper in that one spot