1199 Sudden Engine Vibration on track...

SuperDomestique said:

Tough to tell. I saw the rod and the surface looked ok visually. And if you’re saying the shells look good, then most likely it wasn’t the bearings. Valves also looked ok at least on the superficial head portion. If the stems look good and straight it wasn’t a timing issue. The piston has that spot where it's worn out or chunked. But something metallic was pinging around your cylinders. I’ve heard in other engines about piston squirters sometimes loosening or a screws loosening into the oil pump assembly. The weird thing is that crankcase became pressurized and dumped oil into the airbox. Any mods to the bike? Did it still have the PCV system? Someone in your post mentioned piston ring failure but you'd expect maybe some smoke as a tell-tale sign and not sudden catastrophic failure. But then again I'm no expert

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SirJAG said:

just a upmap with termi slip on mod wise. I never saw or noticed any smoke until my boot was covered in oil. The piston was missing about 2cm^2 of material...my thought is the airbox was sucking oil past that hole.

The PCV system was still installed.

I appreciate your insights partner...
JAG

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SuperDomestique said:

But then again I'm no expert

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SuperDomestique said:

What coolant were you running?

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SirJAG said:

Distilled water and WW

One time about two or three weeks prior to the failure my dash temp hit 240 splitting traffic in gridlock for about 10 minutes. I could only maintain about 15 mph. Once I saw the temp that high, I hit the shoulder and increase speed till about 50 and it brought it down. Total time that hot was probably less than 10 minutes.

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SuperDomestique said:

Interesting. How long was it in there? And did you get a look at the head gasket or water pump? Any signs of corrosion in the cooling system?

I say this bc water + WW needs to be refreshed frequently to maintain its properties. If you don’t, you can get electrolysis from dissimilar metals

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SirJAG said:

Coolant changed when i first got the bike, and again heading into the first summer after I got it.
Head gasket and water pumps looked great, no signs of corrosion anywhere internally that I could see.
I never go more than 12K miles between coolant flushes...do you think thats too long for WW and Distilled H2O?

thanks for your comments and insight @SuperDomestique

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