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A used engine is always the cheapest option, but there is the possibility of it needing work as well. I would think that your head is fully repairable by a good shop like APE. I personally would do a complete tear down and replace the cam chain as well. It seems like you may have slipped a tooth while running and that caused your orginal problem. Plus you’re going to want to inspect your rods/crank after damage like that

Thanks, I will look into seeing if the head could be repaired- it sounds like a kz head might be possible too? I know APE is out in California. Anyone know of a shop in the Northeast that can do similar work?
Either way I will be taking the the rest apart. I lost one of those rubber rectangular wedges that go on each side of the front timing chain guide pin - that holds it in place- while pulling the cylinder off. I had it then slipped out of my fingers.... It took a dive into the crankcase and I can't find it; and don't need it bouncing around in there... I'm taking that as a sign that I have to tear it all down...
At least mine doesn't look as bad as that Yamaha there.
Thanks for all the advice!

No eBay APP ID and/or Cert ID defined in Kunena configurationI would buy a complete used engine, who knows anything else can be damaged as you knowing yet.

Engine plus the carbs for 199 Euro

Unless this is the last head on earth that will fit your bike , I would replace it with another head.
Getting it fixed is one thing , but at what cost. Doesnt make financial sense to me .
Dave

Street Fighter LTD wrote: Unless this is the last head on earth that will fit your bike , I would replace it with another head.
Getting it fixed is one thing , but at what cost. Doesnt make financial sense to me .
Dave

My thinking exactly.

From the looks of the valve seat, which is black, it looks like the valves weren't adjusted regularly and that valve was hanging open and burned and cracked in half. I could be wrong of course but clearly that seat is burned to crap and half the valve head is gone.

I agree the head looks too chewed up. I will try to find a good engine if it makes financial sense - that one listed looks like it could be a great deal but in Germany ... I do wish I had checked the valve clearances. I checked everything else. I almost did but the guy who had it swore they were recently measured/ adjusted, etc. I rode the bike for 2 months then that was it. Lesson learned.... Thanks for all the replies!

my vote is for a new engine. the broken off pin in the crank is another sign of bad things going on.

DoctoRot wrote: my vote is for a new engine. the broken off pin in the crank is another sign of bad things going on.

Yes, I agree. Since it wasn't in an accident, I can only imagine the crankshaft stopped so suddenly that the inertia of the ignition rotor sheared the pin. That kind of crank-stopping force certainly will poop in your Fruit Loops.