Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: yozzer74 on April 28, 2018, 03:31:38 PM
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My mates just got his bike running after rebuild.does the tapping noise sound ok .we regapped tappits again so there ok .https://youtu.be/xjeSlNsPSN0
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I had a similar noise start on a Yamaha I run, horrendous engine tapping noise, its done 99K miles so thought its knackered, turned out to be a split leaking header exhaust. Worth a check!
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Will do thanks
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My mates just got his bike running after rebuild.does the tapping noise sound ok .we regapped tappits again so there ok .https://youtu.be/xjeSlNsPSN0
Sound like clutch rattle? Does it reduce/disappear if the clutch lever is pulled in?
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Nope it stays there when clutch pulled in
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The speed of the tapping sounds top end y.
It has got oil to both sides of the head? Hasn't it?
Take the tappet covers off to have a good look and don't run it if at all suspect.
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Out of balance carbs. can cause rattles.
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K2 that was first thing we checked .yeah plenty of oil .will take a look at carbs .
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Hi Yozzer, as above I had that noise on mine and it was a leaking exhaust copper crush gasket, sounded very metallic, great relief when I check tightened the headers and it went away!
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Cheers mark will give it a check
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That's how the problem with my down pipe header is presenting itself.
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Sounds like loose tappets to me, if not possibly cam chain
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Have you found out what it was/is yet Yozzer?
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Not yet mark it's my mates bike and he's away at minute
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I spent half a day chasing a tappet noise till i nipped up the flanges on the exhausts i fitted the month previous!
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Easy mistake though Bryan, it really does sound like someone tapping an anvil with a toffee hammer 🙂
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Not yet it's my mates bike and he's away at minute
Hi Yozz....has your mate been back to see Steve yet about this rattling noise ?
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He's taking it over next week Steve told him not to start it again till he's over there with
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What's people's thoughts on this .the tapping noise turned out to be one of the oil feed head barrel bolts being loose .So not getting oil to top end. It's my mates bike he had the top end built by rother classics .he charged him 300 pounds originally for the work .he said it wasn't his fault he only built the engine .surely he should have checked this before rebuilding it. So my mate let him sort that problem. Out at a cost of 700 pounds for him to take engine out and strip the top end again and fix the problem. He didn't get the bike running for that price. Just put engine back in and carbs back on .So when my mate got it all back together. Guess what oil leak from inside the head .So took bike back over to rother classics .to only be told it's nothing he's done .he says it's leaking from one of the cam tower studs .So he's a thousand pounds in and bike still no good .were should he go from here .
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If he's got the required skills to work on these engines he seems intent on not revealing them to his customer!
A business doesn't really work like that, you'd expect a reasonable appraisal before work of the projected outcome and if it requires additional steps/costs to complete a competent repair, then that discussion should indicate the full picture prior to taking on the work.
If he encountered difficulty during the work, then he should have gone back to client indicating a revision was needed to succeed.
He doesn't seem to be taking into account that (besides wanting the job done correctly) these bikes have the consideration of not being able to work on the top end in situ. Makes it even more important to get it right as further work involves the labour of dismantling the bike.
The original problem, if the engine builder says it's not his fault then I don't see that as a good basis for preceeding if you can't even guarantee that you've torqued all the head studs correctly. That's if I've understood it correctly.
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A top end rebuild for £300 ! The parts alone would cost nearly that ;)
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That was just labour no parts
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That was just labour no parts
Are you saying that he had it rebuilt using no new parts or machine work ?
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Top end already stripped head had been skimmed. New guides & rings .gasket set provided.
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Trigger I was interested to know your view on it was.
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Top end already stripped head had been skimmed. New guides & rings .gasket set provided.
I have just read though this thread and K2-K6 asked, if there was oil getting to the top end and you replied yes. And then you stated that the head barrel bolts being loose so, not getting oil to the top end. Confusing ! Seems to be half a story and half a job ;)
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Trigger I was interested to know your view on it was.
It is hard to comment as i have never seen the engine and have no idea of what work has been done in detail !
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Yes when we got the bike running there was oil to top end oil was coming out of the tappit covers when removed .which is what mine was like .it was the engine builder who said there wasn't enough oil ?? To the top end.
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Yes when we got the bike running there was oil to top end oil was coming out of the tappit covers when removed .which is what mine was like .it was the engine builder who said there wasn't enough oil ?? To the top end.
Still all confusing !
To me a engine re build is the whole engine.
I will say that i do spend a lot of time correcting others work as, everyone seems to be starting up restoration shops everywhere, who don't have a clue what they are doing.
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I just think he's paid a 1000 pounds out just in labour no parts .he's got a engine that's still no good which can't be right .
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I just think he's paid a 1000 pounds out just in labour no parts .he's got a engine that's still no good which can't be right .
Take the bike back to the shop and ask them that question !
There must be a invoice for parts and work carried out ;)
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He already as .the engine builder told him were it's leaking from as nothing to do with what he's done .So were does he go from there.
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He already as .the engine builder told him were it's leaking from as nothing to do with what he's done .So were does he go from there.
All depends on what the invoice says on what work has been carried out.
Were is the leak from ? Head, rocker, pucks. Clean the engine, dry it off and put a layer of talcum powder over the engine and this will show were the oil is coming from.
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Not sure if I've got it right, but to clarify.
Was the original "tippety tap" problem considered to be caused by the head/barrel stud being left so lose so that oil pressure, although getting to the head, was not able to pressure the cam carrier etc?
If that's the case, which person was responsible for mounting and torqueing the head onto the engine?
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K2 that would be the engine builder
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Is the engine builder the same person / company that reassembled the head?
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Yes it is
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So you have your answer then. If your mate asked a company / person to do a job and that job was not done to the standard expected of a competent, professional engine builder, the liability remains with that company but only if your friend can prove that nothing he has done after taking the engine back from the builder, or by supplying his own parts, has contributed to the damage now caused. What I will say is that if it was a well established reputable company, they would have no issues with re doing the work as their reputation is at stake. If it's a tin pot bunch if cowboys who know diddly squat and are playing at being engine builders, good luck, I don't think you will get anywhere.
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Did the engine builder ask your mate to supply the parts ? If so, then he was covering his arse.
In a courts the court take a very dim view to any aftermarket parts being used (the same as a main stream manufacture, will not guarantee vehicle if any aftermarket parts fitted or any modifications).
The courts will not back up any claims to any vehicle that is non standard.
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If its who and where I think, doesn't he specialise in 750 sohc engine building. Its about 3 or4 years since I was in his workshop.