did you end up fixing the issue?i am having the identical problem,2007 king quad 700 i replaced the head gasket,piston,rings,and water pump ,and found the same bolt in the head was broken right by the timing chain galley,i put it all together and it was still leaking coolant into the oil,any advise?

 

I did finish the repair. Had to order some tappet spacers and such. It runs good. I haven't drained the oil yet out of it to check. But it's holding coolant so I think it's ok. I think I have a header leak as it sounds a little different. It also is backfiring just a bit sometimes when I go to stop hard at higher speeds.
I still need to tune it and make some more tweaks. Wanted to run it a little and then change the oil again.
Hoping it's all fixed though.