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Well now. So it almost seems like something got wedged in the other side of the piston and pushed this side against the cylinder wall. Zach seems to think it overheated, but I have dual cooling properly setup, it was in cold water, and I don't see how it could have overheated. The plugs look...

Pistons/rings were installed properly. No, it was my cylinder that I sent out for that port package (which was AWESOME by the way). I absolutely guarantee it was catching, but I didn't make a big deal about it mostly because it went away after a few strokes and, well, you know... that...

The original problem was me using a riva head and not realizing it was thicker than stock. I ran it for a year on my old stock setup with stock bolts. Switched to a maniac/blue top end and stripped out every single head bolt on my first ride, only to find out they were only threaded in 3/8" of...

Piston and 2 sets of rings on the way, thanks to jet maniac. I just THOUGHT about buying them and instantly I had a PM in my inbox saying they would be at my doorstep tomorrow. Going to clear off the aluminum, hone it a bit, replace both sets of rings, and go through it all with a fine toothed...

Me too. I'm a bit apprehensive about throwing a new piston/rings in there because I'm not entirely sure what caused the failure. I'm also hoping I'll be able to hone that out. If not, eff it, I'm just getting a new cylinder...with all the problems I've had with clamping the head down. I'm like...

Well, I think it's missing a chunk of ring too. The little knick itself is nothing. I'll pull it tomorrow. And cry. Lots of crying.

FRICK FRICK FRICK FRICK FRICK. I re-attached head, made a perfect seal. Zero comp again. Checked out piston very closely. There are a few little knicks on the edge. Took a look at the cylinder wall and found that. I THINK it might be a chunk of ring that did it. Can't see where it's missing...

Frick. okay I'll find out tonight I guess. The head is already off. I'll reuse the orings for testing because they look perfect. (I just ordered a bunch from mcmaster carr). I'm just going to bolt it back together and test compression. Stupid question... Let's just say several head bolts...

(I did just buy a topend lol) Tried that last night, no change. It HAS to be the oring, I just don't know what else it could be. Tonight I'll check for the sleeve/cyl evenness. Even though it appeared tight and girdle was tight, I just don't trust those coarse threaded head bolts.

Test was good, gauge is good (worked fine with other cyl). I thought for sure it was an oring, but they looked okay. I can't imagine them staying "okay" during the combustion process while leaking/blown. I'm going to reassemble when I get home tonight and test again and maybe take her out to...

Update Thread: http://www.x-h2o.com/threads/137685-ADA-head-oring-question-(zero-comp)

Quick history on my setup: I have a fancy ported 61x cylinder. Stripped all head bolts because this Drilled out, helicoiled, and used bigger bolts. They have a more coarse thread. The bolts go in tight and give no indication of backing out. I was out yesterday, did a WOT run on my way...

I measured today. Just for reference, the stock bolts are short about 1/2" short Which is huge. Surprised it held up this long.

I didn't have a chance to measure the thickness, but that **HAS** to be the problem. The more I looked at these bolts...they could have gone a LOT lower into the head.

Hmmmm. Swapped plugs with another ski awhile back, didn't even dawn on me they might not be the ES. Ooops. But as mentioned, that wouldn't have caused this. They have been in there for at least 2 prior rides. What I did notice is that my head bolts didn't go that far into the holes. Only about...

It was the combustion (fireball). I don't think the head physically left the motor, just lifted up lots. What it looked like right after the lake Obviously, the stator side cyl had the problem Head. The clean one is the stator cyl. The head is still in good shape. Good...

Already did, thanks! :P Jesus! There were that many fumes? I would have never thought engine bay explosions on these things were a "thing". The sound it made was awful. Like PFOOOMP! would be a good descriptive word. I'm kinda glad the hood flew off, who knows what else could have happened if...

Just got my meat hooks on a 62t/61x in a CLEAN raider for $900. I can swap in a 650 or something into the raider so I can sell it. Finally moving to the "dual carb darkside". I'm going to helicoil it. I don't want to give up my fancy blue cylinder. God, I guess that means I really do need to...

ugh. But it torqued down okay. Who knows. So you think heli coils are bad for head bolts? I might go time-serts. I am looking forward to tracking down that oring and bolts tonight lol

Yeah come check it out. Like I said, it's not their fault. They were in my jetboat, it's not like I was with other standups. They were just as freaked out... I wasn't in danger, it was just kind of a long swim and getting dark. I wouldn't have made it to whiskey before sundown.