Wowzers
 

Bad news. I blew the head gasket.
Good news. Ive got a new one in my drawer and I can change it in my sleep. 9~]

Bad news indeed. Good you have an extra and the skill to replace it.

Lol, didnt you jist replace like the entire motor?

Rebuilt with chinese parts. Then put suzuki parts back in with chinese gaskets.
Time for a Suzuki head gasket I guess.
Those Alibaba GN250 parts are made of mouse queefs >:(

Good to know. I guess sometimes you just have to spend the coin.

Oh well.
Even for a failed build/experiment...... I got thousands of miles ;)

All my previous builds I just got factory .5 mm overbore piston, new rings, gaskets and new valve guides then let the machine shop do their magic and then I reassemble with factory gaskets and a tiny bit of mojo.

One thing is surprising... This silly thing just keeps running like the Terminator.
It has it's fits but just wont quite die 9-]
It ran spitting out combustion gasses and oil but it just kept running o_O

I have to say, they are built like a tank for an economy level bike.

The GZ is a simple bike with relatively simple cures when things go south.

That's actually good to know for me as I look around for parts and pieces online.

.5 over isnt much but we are talking only a 250cc.. did you notice any different performance changes at .5 over?