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Post by giggsey999 on Feb 23, 2021 15:38:04 GMT 1
I bought my 350 pv about 5/6 weeks ago and was told by the seller it had had a £1500 engine re build mid 2019,up until today I had only had a quick spin round the block on it so was keen to get out a give it a go, all was fine for about 9 miles, I took it easy, got up to temp then started to stretch its legs a bit and at about 8k revs it sized, I coasted to a stop, found neutral and kicked it over and it started first kick, it was always a bit rattley I thought but now sounds like a bag of spanners in a washing mechine so I presume it's a top end re build on the cards. It is running an oil pump, all the oil lines are clear and full of oil and it smokes nicely when it's cold so I'm thinking the auto lube is working. What's my next move, just pull it apart to see what's happened?
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Post by midlifecrisisrd on Feb 23, 2021 15:43:31 GMT 1
That's a right bummer ☹
It's always my worry that no matter how careful you are rebuilding an engine there is always scope for a failure by a schoolboy error or something out with your control
First thing to do is whip the top end off and have a look at the pistons for clues
To some people a rebuild is a set of rings and new gaskets.
Also was it run in after the rebuild
Steve
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Post by elsiefan on Feb 23, 2021 15:58:37 GMT 1
Sorry to hear of your woes.
Had my old X7 nip up on me in the 80's on a journey from Ipswich to Colchester, managed to whip the clutch in before it did too much damage and a new set of pistons and rings (+gaskets) saw me running again. Hopefully that will be all that you need.
Turned out to be the aftermarket K&N's pulling the carbs down on the inlet rubbers and causing an air leak. Do you have any such aftermarket filters?
You might want to pull the plugs out first and see if they show weak running, or any metal deposits on them from melted pistons.
Good thing with a stroker is it's easy to check the top end, unlike a diesel!
If you are unsure, pop some pictures up and I'm sure you will get some helpful suggestions (and a couple of unhelpful ones as well I guess!)
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Post by giggsey999 on Feb 23, 2021 16:03:13 GMT 1
I am presuming it was run in correctly, I have a dyno sheet from mutts Nutts dated 4th August 2020 so I would think it was run in before that.
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Post by steve h on Feb 23, 2021 16:04:11 GMT 1
Always a bit rattley?, after a £1500 rebuild? Something amiss there. Well, more expense now, 2ts.. dont you just love em.
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Post by shaunthe2nd on Feb 23, 2021 16:12:33 GMT 1
That's a bugga.
£1500 on an engine should be a full rebuild. I guess things can still fail, especially if pattern seals were used.
Whip plugs out, check they were correct spec and what they look like. Then whip head off as stated above to see what you find. Hopefully nothing too serious.
Fingers crossed for you.
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Post by midlifecrisisrd on Feb 23, 2021 16:15:41 GMT 1
That's funny as if mutts dyno'd it then it has been ragged and the fuel/air will have been checked
Does the dyno sheet have the a/f line on it?
Steve
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Post by Shytalk on Feb 23, 2021 16:25:08 GMT 1
I think if it sounds that bad it’ll be more than a top end rebuild.
Questions would be - what crank seals were used, was the oil pump rebuilt or not at the same time.
As Steve said if it’s been dyno’d then it’ll have been set up and running correctly.
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Post by giggsey999 on Feb 23, 2021 16:28:47 GMT 1
No, just power line 51.4 bhp.
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Post by midlifecrisisrd on Feb 23, 2021 16:42:10 GMT 1
Good point, Yambits crank seals fail quickly ☹
Jetting is another thing. If it was set up and jetted bang on in hot weather then it may be lean in the cold. Either that or if not used much or old fuel can partially block jets or make it run lean
As said pistons will tell a story whether lean, oil starved or head gasket
Steve
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Post by midlifecrisisrd on Feb 23, 2021 16:42:53 GMT 1
No, just power line 51.4 bhp. Is it standard or pipes/filters? Steve |
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Post by giggsey999 on Feb 23, 2021 16:50:38 GMT 1
Expansion chambers and standard air filter.
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Post by julianboolean on Feb 23, 2021 16:57:55 GMT 1
I had a 250LC that had a blocked oil injector in one carb, everything looked fine and oil came out of the pipe with the engine running, none of it was getting into the right hand cylinder though, could be worth checking that these aren't blocked, I squirted WD40 into them, after a good squirt whatever was blocking it came out - take the carbs off to do this, I don't think WD40 would be good for the engine.
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Post by dusty350 on Feb 23, 2021 17:00:34 GMT 1
I wonder if the top end has been re torqued after initial running ?
Dusty
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Post by giggsey999 on Feb 23, 2021 17:11:01 GMT 1
Anyone be interested in having a look at a video of it running now? I will have to send via Watts app.
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Post by dusty350 on Feb 23, 2021 17:15:11 GMT 1
If you use Flikr you can upload a vid in the same way you do a pic  Dusty  |
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Post by giggsey999 on Feb 23, 2021 17:18:55 GMT 1
I don't have Flikr or know how to use it.
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Post by elsiefan on Feb 23, 2021 17:26:00 GMT 1
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Post by dusty350 on Feb 23, 2021 17:36:32 GMT 1
If you get stuck with Flikr, Whatsap it to me and I will host it on here for you I will pm you my number. Dusty |
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Post by midlifecrisisrd on Feb 23, 2021 17:38:02 GMT 1
To be honest I wouldn't run it
A damaged cylinder is bad enough but more damage from running is bigger rebore size
If there is debris in there you don't want it getting jammed in a port
Just strip it
Steve
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Post by dusty350 on Feb 23, 2021 17:40:57 GMT 1
I agree with Steve, but guess you have already video'd it running ?
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Post by stusco on Feb 23, 2021 17:45:17 GMT 1
Maybe a leak down test if you can it before you strip it
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Post by steeley on Feb 23, 2021 17:47:02 GMT 1
I had a 250LC that had a blocked oil injector in one carb, everything looked fine and oil came out of the pipe with the engine running, none of it was getting into the right hand cylinder though, could be worth checking that these aren't blocked, I squirted WD40 into them, after a good squirt whatever was blocking it came out - take the carbs off to do this, I don't think WD40 would be good for the engine. A friend of mine had this happen on his yamagamma the one side nipped up . He pulled the top end to have a look and got new rings i cleaned the cylinder and piston up but while i was there i noticed the crank had spread which cheered him up ,not. |
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Post by giggsey999 on Feb 23, 2021 17:49:30 GMT 1
Dusty, what you need to send pm?
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Post by giggsey999 on Feb 23, 2021 17:59:35 GMT 1
I have already videoed it, wasn't gonna push it home so rode it gently and filmed it as soon as I got home.
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Post by LC_BOTT on Feb 23, 2021 18:49:27 GMT 1
Might just be the mains or big ends gone, how much work does £1500 get you, I think we just assume no labour charges as most of us do all that sort of work ourselves?? But if done in a garage...
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Post by dusty350 on Feb 23, 2021 19:25:42 GMT 1
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Post by 29davyt on Feb 23, 2021 19:29:36 GMT 1
My Lawn mower sounds better than that !not looking good giggsey 😢
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Post by veg on Feb 23, 2021 19:29:50 GMT 1
£1500 rebuild but rusty head bolts?  ?? |
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Post by midlifecrisisrd on Feb 23, 2021 19:32:19 GMT 1
Oh dear ☹
Sounds a bit more than a heat seizure then free off
Steve
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