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Post by doohanno1 on Mar 22, 2020 17:27:53 GMT 1
And i'm not feeling to well myself now.. Can anybody shed some light on wtf happened here .. 31k bog standard everything...🥺 Melt down on the left but right running so lean aswell. !!!  |
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Post by midlifecrisisrd on Mar 22, 2020 17:55:16 GMT 1
Need a bit more detail
What were you doing at the time, was it fresh fuel, had it been lying
Steve
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Post by doohanno1 on Mar 22, 2020 18:13:33 GMT 1
Fresh fuel, bike in regular use.
In 5th or 6th om 3/4 throtle at the time..nothing different than any other ride out...
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Post by marrcel on Mar 22, 2020 19:08:19 GMT 1
Vacuum taps are notorious to runnin lean
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Post by midlifecrisisrd on Mar 22, 2020 20:32:58 GMT 1
Bummer
Best do a leak down test before stripping it then strip and have a look at the pistons
Steve
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Post by tacky1 on Mar 22, 2020 21:36:57 GMT 1
That looks like either a leak or ran really lean. What carbs and jets are you running.
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Post by doohanno1 on Mar 22, 2020 22:03:09 GMT 1
That looks like either a leak or ran really lean. What carbs and jets are you running. Bike is standard... |
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Post by rigga on Mar 22, 2020 22:43:42 GMT 1
Air leak .....
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Post by chrisg on Mar 22, 2020 22:46:15 GMT 1
+1 could even be a crank seal allowing air in. |
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Post by muttsnuts on Mar 23, 2020 10:42:10 GMT 1
what plug grade you running ?
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Post by 4l04ever on Mar 23, 2020 14:57:03 GMT 1
Sh1t in the carbs... worth stripping them...
Fuel filter blocked...the one in the tank on the back of the tap.
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Post by reedpete on Mar 23, 2020 16:42:16 GMT 1
Piston crown most probably now got a crater burnt out of it, that grey stuff on the plug isn’t called ‘death ash’ for no reason...
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Post by pdxjim on Mar 23, 2020 19:02:00 GMT 1
I would assume it's gonna look like this pic of my TDR when you open it up.  Most likely an air leak somewhere. Mine done this ^ at 75mph on a crowded freeway. Fella behind me said all was well until the big puff of vaporized ally came out the exhaust and all went silent. Will require a full strip to get the crank out and all the swarf out of the crankcase. In a pinch you can rinse out the crank bearings with spirits, but, of course, new bearings and crank rebuild is advised. I have heard of racers just pulling the top end off and filling the crankcase with kerosene a few times to rinse out the bearings, but in these days when everyone is out of work and just lounging around, why not take the time to do it right?  |
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Post by chrisg on Mar 23, 2020 20:03:42 GMT 1
How often would you have to do that?  |
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Post by doohanno1 on Mar 23, 2020 21:53:49 GMT 1
+1Â could even be a crank seal allowing air in. Would there be signs of this before hand like difficulty to start the bike.. Mo problem starting mine.. |
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Post by doohanno1 on Mar 23, 2020 21:54:21 GMT 1
what plug grade you running ? Br9 |
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Post by doohanno1 on Mar 23, 2020 21:55:34 GMT 1
How often would you have to do that?  Don't know about the carbs but i did sh1t my pants.. |
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Post by doohanno1 on Apr 13, 2020 14:40:19 GMT 1
Ouch, left hand side....   |
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Post by doohanno1 on Apr 27, 2020 10:03:20 GMT 1
Just whipped the top end off... Interesting to find 1mm o/s in " good" side and 1.25 in other...somebody must of had this issue before.... I think i got away with the head...!! Barrel looks a bit f#$ked...what do you think...     |
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Post by arrow on Apr 27, 2020 16:48:56 GMT 1
Sorry to hear this. That's a BIG hole in that piston.
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Post by hoist1 on Apr 27, 2020 21:39:41 GMT 1
Did the rings break up? Also re the head, i gather if any high spots are rubbed down the indentations fill up with carbon and that’s acceptable. Back in the day though i was led to believe that the carbon in the pits would cause detonation when hot. Any thoughts?
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Post by 4l04ever on Apr 27, 2020 23:57:07 GMT 1
If you have smeared aluminium in the bore, you can use Hydrochloric Acid to melt the aluminium off. Make sure you do it in a well ventilated place, like outside! Once the aluminium is gone, you can check the bore for scoring. If not bad, you may get away with a hone.
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Post by rigga on Apr 28, 2020 11:11:39 GMT 1
The differing bore size is not uncommon, especially when incidents like thus happen, and one side suffers damage, and the other is fine, and I think people on here have noted there is little in vibration difference when sides are mismatched bore size.
As Rob says you may get away with just a hone in the end, new piston and rings and a leak test to find the cause, and away you go.
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Post by doohanno1 on Apr 28, 2020 14:32:54 GMT 1
Did the rings break up? Also re the head, i gather if any high spots are rubbed down the indentations fill up with carbon and that’s acceptable. Back in the day though i was led to believe that the carbon in the pits would cause detonation when hot. Any thoughts? No they didn't and no damage to the " holed " side of the head lucky enough.. |
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Post by doohanno1 on Apr 28, 2020 14:34:36 GMT 1
If you have smeared aluminium in the bore, you can use Hydrochloric Acid to melt the aluminium off. Make sure you do it in a well ventilated place, like outside! Once the aluminium is gone, you can check the bore for scoring. If not bad, you may get away with a hone. No smeared alloy only " death ash " as reedpete so eloquently put it... |
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Post by doohanno1 on Apr 28, 2020 14:36:52 GMT 1
The differing bore size is not uncommon, especially when incidents like thus happen, and one side suffers damage, and the other is fine, and I think people on here have noted there is little in vibration difference when sides are mismatched bore size. As Rob says you may get away with just a hone in the end, new piston and rings and a leak test to find the cause, and away you go. The crank will have to be stripped aswell as there is some amount of swarf go into it unfotunatly... |
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Post by rigga on Apr 28, 2020 19:10:56 GMT 1
The differing bore size is not uncommon, especially when incidents like thus happen, and one side suffers damage, and the other is fine, and I think people on here have noted there is little in vibration difference when sides are mismatched bore size. As Rob says you may get away with just a hone in the end, new piston and rings and a leak test to find the cause, and away you go. The crank will have to be stripped aswell as there is some amount of swarf go into it unfotunatly... Bugger .... At least you know when rebuilt it's right, always trepidation when running an engine after a issue ..... |
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