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Old 02-22-2013, 11:01 AM   #76
Süsser Tod
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That doesn't sound like a top end problem, sounds like piston slap.
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Old 02-22-2013, 12:06 PM   #77
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Try enriching your mixture and see if that does anything?
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Old 02-22-2013, 02:48 PM   #78
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Sorry to hear the trouble
I wouldn't have ridden it home sounding that way.
I would pull the oil filter now and look for metal and what kind.
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Old 02-23-2013, 10:09 AM   #79
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Not good.
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Old 02-23-2013, 11:02 AM   #80
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Oh man... that sucks! I'm so sorry.

Wow whoever said piston slap had it pretty close.

So I wonder... was that due to the ring gap or something else? I can't help but wonder if it was getting any oil. Gonna have to wait and see what Jeff says.

The piston is toast... but the jug may be salvageable with a good hone. Heck even if it gets bored out ever so slightly it may still be usable. Again, I'd run it all past Jeff.

FWIW, I appreciate you posting all of this... it will likely help many of us avoid a similar fate.

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Old 02-23-2013, 11:34 AM   #81
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Sorry man...

So sorry to hear this planemanx... there is nothing else to say really but that totally sucks - wish you all the best.

+1 on posting this and keep your chin up.

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Old 02-23-2013, 11:35 AM   #82
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Originally Posted by Rob.G View Post
Oh man... that sucks! I'm so sorry.

Wow whoever said piston slap had it pretty close.

So I wonder... was that due to the ring gap or something else? I can't help but wonder if it was getting any oil. Gonna have to wait and see what Jeff says.

The piston is toast... but the jug may be salvageable with a good hone. Heck even if it gets bored out ever so slightly it may still be usable. Again, I'd run it all past Jeff.

FWIW, I appreciate you posting all of this... it will likely help many of us avoid a similar fate.

Rob
I'm pretty sure it was due to the ring gap. As I've posted here and in the big thread, I skipped the gaping process and ended up with these results... You live and learn I guess... Now to see what its going to cost to fix..

The piston is shot, no doubt about that. The cylinder is just scratched. If you run a finger over it, you feel it, but its not bad (compared to the piston) I have to see what procycle offers me to have it corrected.
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Old 02-23-2013, 11:55 AM   #83
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Nearly shed a tear seeing that piston, I wish you the best.
Thanks for posting the build.
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Old 02-23-2013, 11:55 AM   #84
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It seized momentarily. Did you run it low on oil? Maybe too lean. I think you said you jetted it lean to try and get better MPG. Not ideal for breakin or a bigbore.
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Old 02-23-2013, 12:01 PM   #85
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It seized momentarily. Did you run it low on oil? Maybe too lean. I think you said you jetted it lean to try and get better MPG. Not ideal for breakin or a bigbore.
I reset the jetting to a richer mixture prior to running it. I was good on oil. I assume the loud noise I heard was the first score (seize) from the rings expanding.

Do you guys think that there is another issue that was causing the noise in the video? I would have to assume that this was it. When I got home yesterday and drained the oil, It did eat some oil and was blowing blue smoke. This is expected though, if that is whats going on inside the engine. Nothing was sealed properly.
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Old 02-23-2013, 12:08 PM   #86
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Take it to a shop and let them hone out the scoring. Put in a new top end. The tolerance was probably too tight. A couple thousandths more will prevent this from happening again. This is why Wiseco had the nickname Seizcoback in the day. Forged pistons need more tolerance and longer warmup time.
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Old 02-23-2013, 01:03 PM   #87
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Sorry to see that. Can you measure the ring gaps now and post some photos of the rings? They are probably broken if they were too big. Lots of guys make the mistake of not checking the ring end gaps the first time they rebuild an engine, so don't be too hard on yourself.

I also am wondering about lubrication. You said that the oil temp was good. Is there lots if oil in the top end?

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Old 02-23-2013, 01:48 PM   #88
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Originally Posted by Mr. Canoehead View Post
Sorry to see that. Can you measure the ring gaps now and post some photos of the rings? They are probably broken if they were too big. Lots of guys make the mistake of not checking the ring end gaps the first time they rebuild an engine, so don't be too hard on yourself.

I also am wondering about lubrication. You said that the oil temp was good. Is there lots if oil in the top end?

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Plenty of oil in the top end. Ill take some pics of the rings. they looks alright and if I fit them into the cylinder they still fit tight with no gap.
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Old 02-23-2013, 02:10 PM   #89
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Originally Posted by planemanx15 View Post
... if I fit them into the cylinder they still fit tight with no gap.
There seems to be your problem, no ring gap.
What did the instructions say about minimum gap?
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Old 02-23-2013, 02:12 PM   #90
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When you first put the piston in with no rings, did it move freely in the bore? Just wondering what the piston clearance was.

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