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Post by Fox on Feb 19, 2012 17:53:49 GMT -5
I picked up a 150 this morning. The guy said it needed a top end and provided a new piston/cylinder with gaskets. I removed the top end to find that the piston had a huge hole in it and was no longer connected to the rod. The rod is bent too but even if it wasn't bent I would still have to tear the engine completely apart cause there's huge chunks of metal in there. I called the guy and he's going to buy the engine from that $50 Touring scoot I bought a while back for $125 and I'm going to put the new piston and cylinder on that. Anyway, I thought I'd share this because I've never seen a 4T get a holed piston like that. It completely broke away from the rod.  I drained the oil and about a half a quart came out and the plug was dark so I'm thinking it got too hot due to insufficient oil not because it was too lean on fuel but I'm not sure...    The cylinder got mangled too.  |
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slawenm
Scoot Enthusiast
Posts: 171
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Post by slawenm on Feb 19, 2012 18:12:17 GMT -5
wonderful at last one worse than mine feel bad for him though better check my oil before I next ride lol
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Deleted
Deleted Member
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Post by Deleted on Feb 19, 2012 18:20:08 GMT -5
those are some explosive pictures  |
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Post by lshigham on Feb 19, 2012 18:24:50 GMT -5
That is some achievement, I've holed pistons before, but not that big!
I have snapped the con rod on a 139QMB before, I've still got it now as a trophy lol
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vvtr
Scoot Enthusiast
Posts: 243
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Post by vvtr on Feb 19, 2012 18:33:45 GMT -5
looks like it may have soft seized at the top and hit both valves?
i bet theyre a mess as well?
on my gy6 i check the oil every time i refuel... they do burn a bit!
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Post by Fox on Feb 19, 2012 18:44:17 GMT -5
looks like it may have soft seized at the top and hit both valves? i bet theyre a mess as well? on my gy6 I check the oil every time i refuel... they do burn a bit! The valves themselves look okay but there's a few deep gouges and a bunch of little pits in the head all around the valves. |
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vvtr
Scoot Enthusiast
Posts: 243
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Post by vvtr on Feb 19, 2012 18:53:34 GMT -5
defo scrap then eh?
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Post by 190mech on Feb 19, 2012 19:04:48 GMT -5
It looks like it was trying to make itself a 2 stroke!! :rofl:
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Post by aeroxbud on Feb 19, 2012 19:17:06 GMT -5
That is what this picture reminded me of. Back in the mid 80's and all the RD350 pistons we holed lol
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Post by 90GTVert on Feb 19, 2012 19:40:33 GMT -5
Impressive carnage. Thanks for the pics.
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Post by Fox on Feb 19, 2012 20:56:33 GMT -5
I forgot to mention that the piston pin was sheared in half. One piece was in the rod and the other half of it is inside the engine.
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Post by stepthrutuner on Feb 20, 2012 8:07:08 GMT -5
Incredible. I'm wondering if the piston might have had casting flaws to begin with for all of that to happen.
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Post by Goosey on Feb 20, 2012 10:48:18 GMT -5
Ouch |
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Post by usmcdoc on Feb 20, 2012 10:56:52 GMT -5
With a bent rod....and the size/shape of the hole....looks a double valve hit....odd. Talk about a 'Grenaded' engine...wow... Sorry to see that....it sux..... :stars:
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Post by bigkahuna427 on Feb 20, 2012 13:22:10 GMT -5
I know plenty of people that would say, "nope never heard a thing"....
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I drained the oil and about a half a quart came out and the plug was dark so I'm thinking it got too hot due to insufficient oil not because it was too lean on fuel but I'm not sure... 
