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Post by stusco on Jun 8, 2018 7:08:33 GMT 1
Seized my lc last night at 7000rpm on the M8 locked up solid lucky it wasn’t busy,took a plug out it’s dripping with aluminium,what really pissed me off was waiting 3hours for the recovery vehicle 😭
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Post by midlifecrisisrd on Jun 8, 2018 7:13:28 GMT 1
Oh for f*cks sake
I'm starting to worry about associating with you in case this rubs off.
Could your luck get any worse
Steve
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Post by stusco on Jun 8, 2018 7:20:39 GMT 1
Oh for f*cks sake I'm starting to worry about associating with you in case this rubs off. Could your luck get any worse Steve I don’t blame you |
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Post by billbott on Jun 8, 2018 8:12:40 GMT 1
Who was the breakdown company? I broke down on my Lc last year on the M65. The breakdown company didn’t even reply. I rang over 20 times so ended up getting a mate to collect me. Mine was through Peter James insurance – so I rang them the next day:
Long story short, I was contacted by the director of the insurance company who chased the breakdown people on my behalf. I was compensated. Can’t recommend Peter James highly enough.
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Post by earthman on Jun 8, 2018 8:22:04 GMT 1
Seized my lc last night at 7000rpm on the M8 locked up solid lucky it wasn’t busy,took a plug out it’s dripping with aluminium,what really pissed me off was waiting 3hours for the recovery vehicle 😭 Sorry to hear that, any idea what went wrong/why it seized? At 7000 revs, you wasn't exactly pushing it hard were you. |
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Post by midlifecrisisrd on Jun 8, 2018 8:36:57 GMT 1
Was this your newly rebored, cool head motor which was problematic before?
Think this may need to end up at Mutts to find out the culprit.
At least if the plug was covered in molten alloy it may mean the bores can be saved as sounds like a melt down rather than a lubrication failure or bore clearance issue
Steve
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Post by Shytalk on Jun 8, 2018 10:06:57 GMT 1
Blimey you’re not having much good luck at all.
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Post by Tobyjugs on Jun 8, 2018 10:13:01 GMT 1
Hi Stusco i hope you get to the bottom of this and its a quick fix.
I have noticed on my engines when trying correct the 6k stutter is, If you lean the jetting out in that area to get it to react well then the area just above this is also dangerously lean until it can make the transition into the main jet. I never drop the needle less than halfway because of this. Id rather run with a stutter and too rich.
I have never experianced it but have heard lots of stories about detonation and one of the tell tale signs is small bits of aluminium on the spark plug..
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Post by midlifecrisisrd on Jun 8, 2018 10:29:13 GMT 1
Hi Stusco i hope you get to the bottom of this and its a quick fix. I have noticed on my engines when trying correct the 6k stutter is, If you lean the jetting out in that area to get it to react well then the area just above this is also dangerously lean until it can make the transition into the main jet. I never drop the needle less than halfway because of this. Id rather run with a stutter and too rich. I have never experianced it but have heard lots of stories about detonation and one of the tell tale signs is small bits of aluminium on the spark plug.. Detonation of some sort was my first thought If it's the motor I'm thinking of it has done some miles before this prob so timing and mixture unchanged My worry is the addition of the cool head and around chamber volume and squish Either that or the cool head ain't really living up to its name Steve |
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Post by mattybeckett on Jun 8, 2018 11:01:53 GMT 1
That's bad news, just when you think everything is ok they rear there ugly head. Sounds like a holed piston.
Hope it's an easy fix.
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Post by Tobyjugs on Jun 8, 2018 11:04:48 GMT 1
Hi Stusco i hope you get to the bottom of this and its a quick fix. I have noticed on my engines when trying correct the 6k stutter is, If you lean the jetting out in that area to get it to react well then the area just above this is also dangerously lean until it can make the transition into the main jet. I never drop the needle less than halfway because of this. Id rather run with a stutter and too rich. I have never experianced it but have heard lots of stories about detonation and one of the tell tale signs is small bits of aluminium on the spark plug.. Detonation of some sort was my first thought If it's the motor I'm thinking of it has done some miles before this prob so timing and mixture unchanged My worry is the addition of the cool head and around chamber volume and squish Either that or the cool head ain't really living up to its name Steve Sounds like you could be onto somethig Steve Stusco you still have one unit that is good. Try to do a compression test on the good unit and then check the squish height and uncalculated compression ratio. If thats good its not the cylinder head. |
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Post by steven on Jun 8, 2018 11:05:11 GMT 1
...Aww shite !
You have my condolences m8.
Steven.
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Post by jackjabba on Jun 8, 2018 11:10:11 GMT 1
Shitty luck, Problem is do you rebuild the crank as you have just sputter coated the bearings with molten Aluminium. You could cure your problem only for a bearing on the crank to give up and then trash your top end. Its one of those "do I or don't I" moments.
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Post by stusco on Jun 8, 2018 15:36:01 GMT 1
Was this your newly rebored, cool head motor which was problematic before? Think this may need to end up at Mutts to find out the culprit. At least if the plug was covered in molten alloy it may mean the bores can be saved as sounds like a melt down rather than a lubrication failure or bore clearance issue Steve It is that motor I’ve do about 1000 miles since it was run in was going great ,so I’m having a cuppa then I’m going to look at the damage I’ll do an air test first |
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chrisk
Drag-strip hero
Posts: 281 
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Post by chrisk on Jun 8, 2018 17:17:42 GMT 1
Hi..
Which side seized.
Btw.. if your bores need alloy removing, I find spirit of salts does the job using cotton buds. Be carefull tho the fumes aren't very nice. If the bore has slight scores due to the seizure, this stuff will get the alloy out of them with a bit of patience. Wash thoroughly afterwards..n oil.
Keep away from alloy that you don't want fuzzing away.
May be other methods, but this is easy at home, and does not involve touching other parts of the bore...honing etc.
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Post by stusco on Jun 8, 2018 17:33:52 GMT 1
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Post by steve h on Jun 8, 2018 18:11:27 GMT 1
Kin ell...more expense  |
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Post by Tobyjugs on Jun 8, 2018 19:46:09 GMT 1
That looks like too lean on one side. Your right about doing a pressure test to check for leaks. I had a similar siezure and the cause was a cheap fuel filter that reacted with the fuel and didn't flow properly. |
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Post by arrow on Jun 8, 2018 21:13:56 GMT 1
Sorry to hear of your bad luck again.
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Post by doohanno1 on Jun 9, 2018 14:45:00 GMT 1
Jeez, what a run of bad luck..
Hope you get sorted..
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Post by stusco on Jun 9, 2018 14:51:44 GMT 1
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Post by Shytalk on Jun 9, 2018 15:08:28 GMT 1
I think you have been relatively lucky all things considered.
Do you know if it was an air leak?
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Post by stusco on Jun 9, 2018 16:00:27 GMT 1
Tested it before I stripped it no air leak ! Any ideas ?
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Post by midlifecrisisrd on Jun 9, 2018 16:13:12 GMT 1
I don't like the colour of either of those pistons
Very dry and grey.
How did they look before the last rebore/coolhead
First of all I'd bolt the head back on and check the squish
Also what make pistons are they?
Last set I got from pjme were mitaka but marked as made in Taiwan
Steve
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Post by stusco on Jun 9, 2018 16:23:01 GMT 1
They are mitaka but made in Japan ,I’m sure I checked the squish but can’t remember the size I should write this stuff down.ill get the Ali off the barrel hopefully I won’t need a reborn there is a very small amount of splatter down the crank but I’m splitting the cases anyway to change out the noisy gears so I will check the crank then.
What size should the squish be ?
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Post by midlifecrisisrd on Jun 9, 2018 16:26:40 GMT 1
On a road bike around 1mm
Steve
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Post by stusco on Jun 9, 2018 16:27:43 GMT 1
Cheers
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Post by jessy03 on Jun 9, 2018 16:36:09 GMT 1
That’s bad news, but you do need to get to the bottom of the problem, what was your set up, pipes, filters, carbs, jetting and dome size?
Jess
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Post by stusco on Jun 9, 2018 16:39:03 GMT 1
That’s bad news, but you do need to get to the bottom of the problem, what was your set up, pipes, filters, carbs, jetting and dome size? Jess Tsa pipes,pod filters I’ll get back to you on the rest i really should write it down!! |
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Post by stusco on Jun 9, 2018 17:22:57 GMT 1
I don't like the colour of either of those pistons Very dry and grey. How did they look before the last rebore/coolhead First of all I'd bolt the head back on and check the squish Also what make pistons are they? Last set I got from pjme were mitaka but marked as made in Taiwan Steve It’s never looked lean before |
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