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Author Topic: blew the crank  (Read 522 times)

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blew the crank
« on: January 11, 2014, 03:35:24 pm »
Well I rode less than a mile down the road to my buddys house. I pulled in, shut off my quad and we sat around for about 20 minutes. When I went to start it, it was seized  :( so i got it home took the top end off and the piston was all messed up at the top. It was like chipped in a lot of places and so was the head. What does that mean?
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Re: blew the crank
« Reply #1 on: January 11, 2014, 04:16:34 pm »
Pics of piston and head?
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Re: blew the crank
« Reply #2 on: January 11, 2014, 08:03:05 pm »
It pretty much means you blew it up.

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Re: blew the crank
« Reply #3 on: January 11, 2014, 08:16:36 pm »
Quote from: Rider414 on January 11, 2014, 08:03:05 pm
It pretty much means you blew it up.


Thank you Mr. Obvious,  --> I think he want's to know how it blew up? My first thought thrust washer or bearing, but if he held it wide open for a mile it might be melted piston chunks.
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Re: blew the crank
« Reply #4 on: January 11, 2014, 08:37:02 pm »
Im guessing cold seize.  Not enough lub. Piston started to peel from friction causing more friction.it wasnt enough to seize while running but would have.
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Re: blew the crank
« Reply #5 on: January 11, 2014, 11:14:43 pm »
Take the jug off and inspect further I'm assuming you only pulled the head for inspection
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Re: blew the crank
« Reply #6 on: January 12, 2014, 07:23:10 am »
What premix were you running? Was it 20:1? If not, you need to mix at like 15-20:1
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Re: blew the crank
« Reply #7 on: January 12, 2014, 09:41:27 am »
How old was the piston? Bore could have been loose and piston came apart. Were you running it hard to your buddies house? Could have detonated on a long pull and suddenly pulling in the clutch in over rev.
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