hard knocking


Information and questions on GL1100 Goldwings (1980-1983)
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mcbrayer3rd
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hard knocking

Postby mcbrayer3rd » Thu Mar 08, 2012 10:13 am



just bought a 1982 GL1100 Interstate, its been sitting for 2 years.
just got it running but it has a hard knocking at low rpms, at 3000 rpms you cant hear it (maybe a little)


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virgilmobile
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Re: hard knocking

Postby virgilmobile » Thu Mar 08, 2012 11:25 am

This isn't a knock knock joke is it ? ;)
We have heard a few knocking noises around here on bikes.

It's been everything from a flat spot on a lifter,rod bearings,hyvo chain slap,and loose nuts or missing parts in the clutch and alternator area.

Get a stethoscope from Harbor Freight and see if you can more closely locate the area.
Even post a video if you can.It is much easier when we can hear the pitch and area it's coming from.

Also,does it fire on all 4 cylinders evenly at a idle ? Chain slap from a unsynced engine.
Start it from cold at 1000 rpm for 5 seconds,shut it down and tap lightly on the exhaust headers.Warm is a firing cylinder,cold is a dead one.Don't rev the engine up at this test.We want a pure idle condition.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Thu Mar 08, 2012 6:42 pm

wma video wont up load to page what format can i us
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virgilmobile
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Re: hard knocking

Postby virgilmobile » Thu Mar 08, 2012 6:57 pm

I take my video on my phone,copy it to the computer, then upload to u-tube.once there, copy and paste the link in your next post.easy peasy
I can upload to u-tube directly from the phone too.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Fri Mar 09, 2012 9:50 am



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virgilmobile
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84 GL 1200 I

Re: hard knocking

Postby virgilmobile » Fri Mar 09, 2012 10:23 am

I listened.......Does it fire on all 4 cylinders?(I doubt it) tap the exhaust pipe after 5 seconds of running.A warm pipe is OK a cold pipe is a dead cylinder.
It doesn't sound like a rod knock.It's too loud.
It does sound like a valve hitting the piston.

First thing...Find the dead cylinder.Do a quick compression test with your finger in the hole.Or temperature of the exhaust header.
Second...Pull the timing belt covers and check the timing belts and valve timing.Then pull the valve covers and check the valve travel.

I'm gonna best guess here....the timing belt is so loose it slipped a couple of notches(or was installed wrong) and bent a valve.The valve is still tapping on the piston and the bike is running on 3 cylinders.

That's the best diagnosis I can come up with.Now it's up to you to check.
Please keep us up to date on what you find,and take pictures please.

If I guessed right,and the piston has not been destroyed,it can be repaired.

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virgilmobile
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Re: hard knocking

Postby virgilmobile » Fri Mar 09, 2012 10:39 am

One more thing,I also heard a timing belt whine really loud.Much more than normal.
Just one more reason to look at the belts and valve timing.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Fri Mar 09, 2012 3:48 pm

well i warmed it up, and if this is possible only #4 got hot

checked the belts they look good and tight, i put iton T1, and both was on mark.

had to stop(rain) :roll: :roll:
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virgilmobile
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Re: hard knocking

Postby virgilmobile » Fri Mar 09, 2012 5:23 pm

It sure will run on one cylinder.next step.... Pull all the plugs and stick your finger in the hole,crank it and find out which one dosen't have compression.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Fri Mar 09, 2012 5:31 pm

will do :D .............
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D2D
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Re: hard knocking

Postby D2D » Sat Mar 10, 2012 8:46 am

Did the previous owner do any work on the bike at all? I ask because it sounds to me like the timing is way off too. A few years back I picked up a 78 CX500 and found that the PO had set the timing 180* off. It would start after several attempts and them sound just like the noise you are getting. I checked and found the timing was off, re-set and re-set valve clearances and all of the noises stopped. Just a suggestion.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Sat Mar 10, 2012 1:30 pm

They all have compression, but i noticed that on the spark plugs 1-2-3 did not smell like gas.
Took off the manifolds and #4 was clean from seafoam, but the seafoam did not get to 1-2-3, so now im looking at the carbs :shock:
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virgilmobile
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84 GL 1200 I

Re: hard knocking

Postby virgilmobile » Sat Mar 10, 2012 9:09 pm

It's amazing it runs on one cylinder,huh?Yea It's time to pull the carbs.Let us know how they look in the bowls.Take some pictures too.

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Sun Mar 11, 2012 9:50 am

two float vale needles glued shut, one vacuum cylinder gummed up, accelerator pump diaphragm had a tear in it, air cut off valve diaphragm is like sticky bubble gum, i cleaned it the best i could put it back together. and yes it runs alot better but still will not stay idle and now have fire works coming out the tail pipe. i will have to rebuild the all carbs. yeah
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virgilmobile
Posts: 7646
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: hard knocking

Postby virgilmobile » Sun Mar 11, 2012 10:11 am

Good job and good diagnostics.Take your time on the carbs,get the slides to move butter smooth.Plenty of "how too" articles here.
If it ran that good on one cylinder,just imagine what a 75% increase will do. :D :D

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Wed May 02, 2012 8:46 pm

running better, but not right yet.
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Re: hard knocking

Postby littlebeaver » Wed May 02, 2012 10:43 pm

Brother man, you didn't mention the slow jets...I think your slow jets are clogged, aren't the 82's unscrewed not pressed, 80-81 are pressed in 82-83 are screwed in aren't they Virgil..

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mcbrayer3rd
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Re: hard knocking

Postby mcbrayer3rd » Tue May 15, 2012 10:39 pm

3 slow jets are clogged, now clean and purring . front fork seals next


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