Knocking noise please help


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Grahamkeegan1989
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Knocking noise please help

Postby Grahamkeegan1989 » Mon Jan 11, 2016 1:32 pm



Hi my gl1200 makes a bad knocking noise when started it seems to leaves when moving but still I need to no what we think it is please




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twocams
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Re: Knocking noise please help

Postby twocams » Mon Jan 11, 2016 10:24 pm

When I was growing up the old farmer up the road had a IHC Corn Binder that sounded like that. But only when he was cutting Alfalfa hay. :shock: But that sounds like it could be a rod knocking. Have you tried to pinpoint the location where its coming from. One of the heads? Down low in the crankcase? Is it low on oil or was it low at one time?

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Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Tue Jan 12, 2016 3:04 am

At the front of the bike it hasn't been low on oil since I've had it but unsure of the past. The noise has got worse since I've had it.

thompsoj22
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Re: Knocking noise please help

Postby thompsoj22 » Tue Jan 12, 2016 6:51 am

just my opinion, it is hard to tell from listening to the video but its bad whatever it is. the pitch seems to low for a collapsed lifter. it sounds "cylinder specific" as it has a cadence so the rod/wrist pin is likely. My advice is simply go on ebay and buy a low mileage motor for approx. $500 to $700 and install a new stator, starter clutch insp, and clutch insp and down the road you go. Take your existing motor apart for fun and see what went wrong. it dosent sound like any type of "magic additives" are gonna cure that knock.

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twocams
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Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
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Re: Knocking noise please help

Postby twocams » Tue Jan 12, 2016 6:11 pm

Is that London, England? I lived in England for 5 yrs and never saw any Gold Wings. So that being said, looks like most of the engines are coming from the US.......$$$. if you want to keep the Wing I would take the engine apart. Rebuild the engine if need be. Other wise maybe get a BMW K1100LT/K1200LT great old bikes and easier to get over in that area.

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julimike54
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Re: Knocking noise please help

Postby julimike54 » Wed Jan 13, 2016 1:41 pm

Might be a wild pitch, have you checked the carb synch? Not sure but if it was out far enough, maybe make that noise?
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Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Wed Jan 13, 2016 2:15 pm

Hi all yes England it is and your correct almost impossible to find clean parts over here!! But to be honest I love the bike me and my dad were both so excited when we collected it and it holds a very nice memory of me and him anyways sentimental s**t over with the carbs probley need syncing and I've been looking into this but every shop I call say " oooo that's a very large bike isn't it call me back in two weeks and I see if I can do it them" so it might be a diy job!!!!????

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Maz
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Re: Knocking noise please help

Postby Maz » Wed Jan 13, 2016 2:35 pm

Hi, I think julimike54 is onto something. To me it sounds like my GL1000 did when the idle circuit on #3 carb was blocked. These engines do sound like they're about to self destruct when idling when the carbs are out of sync/clogged . Could need a thorough ultrasonic clean and check over.
I'm in England too. I'm also a VJMC member and that really is the club to be in for help with classic Japanese bikes.

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Mh434
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Re: Knocking noise please help

Postby Mh434 » Wed Jan 13, 2016 2:40 pm

Just a thought - from the sound, it's possible you have either a dead spark plug/wire, or a carb way out of balance or not providing fuel. Both of those, obviously, are preferable to rod knock or piston slap (although it doesn't sound at all like the latter to me). I had a Kawasaki Concours that sounded just like that (and I thought I'd need a new engine), but it turned out to be a stuck carb float, and no fuel was getting to that cylinder.

Personally, I'd start by checking to see you have a good, strong spark, and a good fuel supply, to all cylinders. If it IS a misfire due to one of the above, a simple way to check is with a pocket laser thermometer. With the engine running, aim it at each exhaust pipe. The one that's cold will be the issue. That's how I diagnosed my Kawasaki - worked like a charm.

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urbanmadness
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Re: Knocking noise please help

Postby urbanmadness » Wed Jan 13, 2016 8:13 pm

Carb sync..... They sound like that when one carb is a bit out. I would get a set of vacuum gages and read the carb sync procedure for the 1100's. I think the 1200's are very similar. It's not that hard. One way to tell, is up the idle about 200 rpm and see if it's better. If it is, it's a carb sync or plugged up carb issue. What you hear slapping around is the primary chain and it sounds horrid.

Sync first, and if you can't get it better, then pull the carb rack or try running some sea foam thru it for a few tanks.

A note about rebuilding goldwing 4 bangers. It's really hard to track down all the bearings now. They are out of production, that's why most of the guys say, change out the motor.

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wingman12
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Re: Knocking noise please help

Postby wingman12 » Wed Jan 13, 2016 10:36 pm

After listening several times to the recording it does remind me of the noise from the 82 1100 I restored last winter, check your timing, check your compression ( all cylinders should be around 150 to 160 psi) . When warming up to synchronize carbs, see if the exhaust pipes are all hot (test after about 20 seconds after starting) you probably have at least one carb not supplying fuel. May be solved with seafoam or equivalent in the UK. Possibly you might have to remove and clean every portion of each carb. Make sure your slides work smoothly. (Buff all surfaces with aluminum foil and plenty of parts cleaner) good luck and please keep us posted on your progress and solution. :D :D

thompsoj22
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Re: Knocking noise please help

Postby thompsoj22 » Thu Jan 14, 2016 8:06 am

a simple way to discount the "carb sync theory" is to simply apply the choke. does the clunking go away completely? if yes than its carbs. If not than its internals. unfortunate on the parts availability in your region. I consider myself an accomplished mech and I personally would not get into any crankshaft work on these bikes, you just cant get the parts. If you could get an aftermarket kit that inc a crankshaft with bearings than maybe but it just isn't avail. I also think I hear a lot of lifter clatter which suggests low oil pressure, pressure escaping past a bad bearing is my guess. understand carb sync is only applicable to idle and initial "off" idle performance, once the throttle is opened especially with "CV" carbs it just isn't that critical.a torn or leaking cv boot could kill a cyl. does it only clunk at idle?

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urbanmadness
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Re: Knocking noise please help

Postby urbanmadness » Thu Jan 14, 2016 9:43 am

I'll remember the choke test, next time I'm playing with a 4cyl goldwing. I constantly learn things from the people on this site....

Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Thu Jan 14, 2016 2:11 pm

Hi all thanks again for everyone's help I ordered a carb sync and will do this once it's here.. And no the nocking noise is there even with the choke down.

So guys if I do this

Step 1: balance carbs
Step 2:run sea or equivalent threw carbs (do I put this in the petrol tank)
Step3 : change timing belt

And if that all fails driver her till she's gives up the ghost

Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Thu Jan 14, 2016 2:12 pm



This is her with a bit of light Lol

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Mh434
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Re: Knocking noise please help

Postby Mh434 » Thu Jan 14, 2016 2:21 pm

Unbalanced carbs at idle will make that sound. The pulses are uneven, and the slide on the unbalanced carb will clack against its idle stop. To be honest, the sound of your engine is precisely like a 4-cylinder running on 3 cylinders, with the 4th having its carb clacking.

With any luck at all, that's all it is.

Remember, piston slap or rod knock won't cause the engine to run on only 3 cylinders, which appears to be the case at the moment. The second video really makes it clear to me that you're simply not getting firing on one of the cylinders, rather than having a serious mechanical issue. I'm pretty sure the problem is a simple, easily fixed one.

***BTW, if you haven't already done so, you should check spark at each cylinder as well. A dead plug or plug wire (in addition to the rough running you're hearing) can cause enough imbalance to cause that cylinder's carb slide to clack.

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twocams
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Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: Knocking noise please help

Postby twocams » Thu Jan 14, 2016 3:38 pm

Well Ive never heard a carb make that much noise, but hope that s what it is. Now sounds more like a bad exhaust leak. Can you put your hand up around the underside of the heads ( without getting burned of course) where the exhaust connects. If its a bad leak should be able to feel it. just another thought from the peanut gallery. :P

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Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Thu Jan 14, 2016 4:42 pm

Ok dudes well I will get the balancer on Monday and once I do it I'll post a vid about this sea foam how or where do I put this????

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urbanmadness
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Re: Knocking noise please help

Postby urbanmadness » Thu Jan 14, 2016 5:34 pm

Sync the carbs first. Actually, I'd adjust the valves first, then sync the carbs.

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julimike54
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Re: Knocking noise please help

Postby julimike54 » Fri Jan 15, 2016 9:09 am

1200s have hydraulic lifters, no adjustment
+1 on checking that it's running on all cylinders, when running pull plug wires one at a time & note if there is a change in running or not, if one has no change to running condition, that is your problem cylinder
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Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Fri Jan 15, 2016 3:01 pm

Hello again people

have a look at this vid if you good people have time thanks

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Maz
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Re: Knocking noise please help

Postby Maz » Fri Jan 15, 2016 3:13 pm

Sounds slightly better but I think it's because the idle speed is a bit faster. Still sounds like it's running on 3 cylinders, though. As suggested, remove the spark plug caps one a time until you find the one that makes no difference to the idle speed.
Maz
Nostalgia is not what it used to be!

Grahamkeegan1989
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Re: Knocking noise please help

Postby Grahamkeegan1989 » Fri Jan 15, 2016 3:16 pm

Hi maz I did that and all made engine sound a lot different like it was going to die

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Maz
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Re: Knocking noise please help

Postby Maz » Fri Jan 15, 2016 4:08 pm

Hi Graham. That's good in one respect as it shows that the ignition system is good (although the timing should be checked). Go ahead with the carbs sync when the gauges arrive and see what difference it makes. We're all waiting to help you out.
Maz
Nostalgia is not what it used to be!

Grahamkeegan1989
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Motorcycle: Gl1200 1984

Re: Knocking noise please help

Postby Grahamkeegan1989 » Fri Jan 15, 2016 4:15 pm

Cool thanks guys also one more question if you will. I was going to follow the gl1100 carb sync video on YouTube are they the same sorry and thanks g
Again lads




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