loud knocking noise at mid to high RPM


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Big Mack 13
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Joined: Sun Mar 13, 2016 1:53 pm
Location: Sicily, Italy
Motorcycle: 1982 Gl1100 Interstate, European spec.

loud knocking noise at mid to high RPM

Postby Big Mack 13 » Fri Aug 12, 2016 12:58 pm



So, i have done my research before i decided to post this. Everything i have read has been about low RPM knocking, out of sync nocking, poor fuel, no spark, firing on one cylinder or 2. I have the complete opposite problem, bike ideals wonderful, runs great but still has a knock that appeared out of nowhere.

The Carbs were rebuild by pistol pete, he did a wonderful job. I screwed up and didn't completely clean out my fuel tank and clogged up all the jets. So i got that fixed 3 weeks ago, i currently have the disassembly and removal of the carbs down to 45min. I have put 600km on the bike in the last 3 weeks, it was running wonderfully other than i was unable to fuel out past 6000 rpm when i needed to get outta the way of crazy Sicilian drivers. Well i have a long weekend this weekend so i pulled the carbs out, ensured the floats were set at 15mm and cleaned out the jets ago.

Poof knocking noise. so i pulled them out a second time and ensure it was 100% clean. it was. now i still have the noise.

I did took a blunt metal object to use a stethoscope and try and locate the noise. i can not seem to hear it on the left or right side or on the bottom side.

From what i have read it is due to preignition knock, so on to the spark plugs, 3 spark plugs have a perfect burn on them, the fourth was a little darker but still with in a normal range.

timing belts have been changed, oil is good, i did add the recommended amount of seafood 4 or 5 days ago.

I am trying to get the video up i will post it ASAP. Thank you all in advanced.



Big Mack 13
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Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Fri Aug 12, 2016 1:12 pm

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roadwanderer2
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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Fri Aug 12, 2016 2:02 pm

i might be wrong, but to me that sounds like its in the valve train on the right side of the motor. possible loose or bent valve, cam lobe rounded out, or something is hanging up. can you pull the valve covers and check to see if any of the valves are loose, bent or hanging up?. in any event, i wouldn't run that bike until its checked by a bike mechanic, but thats my personal opinion.

stuart.

Big Mack 13
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Joined: Sun Mar 13, 2016 1:53 pm
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Motorcycle: 1982 Gl1100 Interstate, European spec.

Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Fri Aug 12, 2016 2:20 pm

I will take a look tomorrow morning and see what is going on inside.

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Johnyy Smoke
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Re: loud knocking noise at mid to high RPM

Postby Johnyy Smoke » Fri Aug 12, 2016 3:01 pm

I agree, don't run it until you get this fixed. Could be a dead cylinder. How is your spark?
Almost has to be gas or electrical related. Bent valve is a concern.
What type off seafood do you feed your bike? :) Regards, Johnny

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roadwanderer2
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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Fri Aug 12, 2016 4:08 pm

Johnyy Smoke wrote:I agree, don't run it until you get this fixed. Could be a dead cylinder. How is your spark?
Almost has to be gas or electrical related. Bent valve is a concern.
What type off seafood do you feed your bike? :) Regards, Johnny


i think he meant to say sea-foam. i've never heard a dead cylinder sound like that. wouldn't a dead cylinder sound like a misfire? that sounds more metallic than anything else. could it be a timing belt thats missing a couple of cogs and the valves are hitting the pistons? definitely do NOT run that bike until you at least take the valve covers off along with the belt covers off and see whats going on in there. if it is a belt going bad, your running the risk of damaging the motor if you continue to run it. Honda recommends changing the timing belts every 10 years/30,000 miles. whats the mileage on your bike and do you know if the belts were ever changed.

stuart.
Last edited by roadwanderer2 on Fri Aug 12, 2016 4:15 pm, edited 1 time in total.

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Johnyy Smoke
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Re: loud knocking noise at mid to high RPM

Postby Johnyy Smoke » Fri Aug 12, 2016 4:13 pm

I think he meant to say sea-foam. i've never heard a dead cylinder sound like that. wouldn't a dead cylinder sound like a misfire? that sounds more metallic than anything else. could it be a timing belt thats missing a couple of cogs and the valves are hitting the pistons? (Stuart)

True. I wonder if he had the noise before the carbs were rebuilt? Regards, Johnny

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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Fri Aug 12, 2016 4:27 pm

Johnyy Smoke wrote:I think he meant to say sea-foam. i've never heard a dead cylinder sound like that. wouldn't a dead cylinder sound like a misfire? that sounds more metallic than anything else. could it be a timing belt thats missing a couple of cogs and the valves are hitting the pistons? (Stuart)

True. I wonder if he had the noise before the carbs were rebuilt? Regards, Johnny


ok, he said the belts were changed, but, could they have been put on with the right side cam gear a couple of teeth off T1? BTW, Big Mack, in what gear are you doing 6,000 RPM? after listening to it again, it almost sounds like a bad crank bearing, connecting rod or a wrist pin coming loose? hope im wrong about that, but it almost sounds like it because its not doing it until he puts the engine under a load. it don't sound like a "rattle" from preignition knock to me, but i could be wrong.

stuart.

Big Mack 13
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Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Sat Aug 13, 2016 2:33 am

I did not have the noise before the carbs were rebuilt. Yes it was sea foam not seafood ha.

I am leaning towards a spun bearing myself. Before the carbs got rebuilt it flooded the crank with gas and thinned it out which caused the pressure to drop I'm afraid that damage has caught up to it now. When the oil light came on I was at 160kph. :(

Just so everyone knows it is a European bike that has been frainkenstined before I got it.

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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Sat Aug 13, 2016 6:37 am

oh man. sorry to hear that. well, you have 2 options, take the motor off the bike and tear it down and rebuild it, or find another motor and replace it using your rebuilt carbs. you said you had the belts replaced? you might/should take them off and put them on the new motor you find before you put it onto the bike and any other "new" parts you've already installed.

stuart.

Big Mack 13
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Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Sat Aug 13, 2016 6:44 am

Adjusted the valves this morning. They were off a little but not much. After making the adjustment there was no change :(. So I'm still hoping and praying it's the valves so I am going to pull the front off and check the belts and timing this afternoon and try again.

New update though.

There was an excessive use of oil in 600km about a half quart was added to bring it back up to full. :(

Will anyone be willing to ship a motor to an FPO/AE Address ? :)

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roadwanderer2
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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Sat Aug 13, 2016 6:57 am

Big Mack 13 wrote:Adjusted the valves this morning. They were off a little but not much. After making the adjustment there was no change :(. So I'm still hoping and praying it's the valves so I am going to pull the front off and check the belts and timing this afternoon and try again.

New update though.

There was an excessive use of oil in 600km about a half quart was added to bring it back up to full. :(

Will anyone be willing to ship a motor to an FPO/AE Address ? :)


a half quart in only 600km is not good, but it does sound like its an "internal" engine problem. if you have access to eBay, you might be able to find another motor on there and its possible it could be in your area or closer than here in the states.

stuart.

Big Mack 13
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Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Sat Aug 13, 2016 11:38 am

Went to check the belts this afternoon. And....... The right side came loose :( ..... Tightened her up and....... Nota darn thing changed. So I pulled the right head off. Can anyone tell me if this is normal???? HAHAHAHAHA


where can I get parts? And since I have to pull the motor what else is a good idea to replace?
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Big Mack 13
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Motorcycle: 1982 Gl1100 Interstate, European spec.

Re: loud knocking noise at mid to high RPM

Postby Big Mack 13 » Sat Aug 13, 2016 12:09 pm

After looking at another thread it seems the cylinder actually looks normal. So that means there is a spin bearing on the inside :(.

Here is what the inside of the head looks like if anyone can give advice that would be aamazballs. Thank you again for the comments and anything in the future.
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Johnyy Smoke
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Re: loud knocking noise at mid to high RPM

Postby Johnyy Smoke » Sat Aug 13, 2016 5:01 pm

I would get another motor. And put your rebuilt carbs on it.
Swapping out the motor is not a very hard process, just tedious.
Sea foam? Now what do I do with all the shrimp I bought for my bike? Regards, Johnny

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roadwanderer2
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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Sat Aug 13, 2016 6:18 pm

Big Mack 13 wrote:Went to check the belts this afternoon. And....... The right side came loose :( ..... Tightened her up and....... Nota darn thing changed. So I pulled the right head off. Can anyone tell me if this is normal???? HAHAHAHAHA


where can I get parts? And since I have to pull the motor what else is a good idea to replace?


from what i can see of the pistons inside that part of the cylinder block, i would say they your current motor is done including the valves. i would pull those valves out and check to see if they aren't bent, but here's what i would do........get another motor, swap out YOUR rebuilt carbs AND you new timing belts, put er all back together and see what happens. chances are you have a spun bearing or a bad wrist pin in that motor.

stuart.
Last edited by roadwanderer2 on Sat Aug 13, 2016 6:23 pm, edited 1 time in total.

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roadwanderer2
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Re: loud knocking noise at mid to high RPM

Postby roadwanderer2 » Sat Aug 13, 2016 6:21 pm

Johnyy Smoke wrote:I would get another motor. And put your rebuilt carbs on it.
Swapping out the motor is not a very hard process, just tedious.
Sea foam? Now what do I do with all the shrimp I bought for my bike? Regards, Johnny


johnny is right. its a little time consuming, but well worth it in the long run to just change motors using what new parts you've put into the motor you have now.

quote johnny- Sea foam, "Now what do i do with all the shrimp i bought for my bike? LOL johnny, your funny.

stuart.

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Re: loud knocking noise at mid to high RPM

Postby WingAdmin » Mon Aug 29, 2016 9:51 pm

Both those exhaust valves look burned, and the one piston is not looking healthy either.

My guess? A bad valve spring (or two), that can't close the valve quickly enough at higher RPM. That would account for the exhaust valve damage.

I agree, the cost of fixing this is going to far exceed the cost of a new engine.




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