Knock knock, Time for new motor?


Information and questions on GL1100 Goldwings (1980-1983)
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BigSwede
Posts: 52
Joined: Fri Dec 02, 2011 11:26 pm
Location: Sunnyvale, CA
Motorcycle: 1983 Gl1100

Knock knock, Time for new motor?

Post by BigSwede » Thu Jul 20, 2017 5:58 pm



sooooooo… recently when riding to work, while acelerating hard my engine started making a loud knocking sound. It happens when revved over 3000 RPM and under load. It happens when revving in neutral but not nearly as loud. sounds like my car did when it spun a rod bearing.

When I first got the bike back in 2011, it had a bad water pump & the oil had that nice foamy mayo/milkshale look & consistency so I'm thinking that might have started some wear that has now turned catostrophic.

I'm going to try & get a recording of the sound and post it here soon.

Any ideas? Is it time to start looking for a "new" engine?

P.S. t runs fine other than the knock, no power loss or vibration, idles fine


Current:
83 GL1100 Interstate
Past:
76 GL1000
74 Honda CB350
86 Honda Elite 250
85 Yamaha Riva 175
82 Yamaha Seca 650
76 Yamaha RD400

Milkman_d83
Posts: 13
Joined: Mon Jul 17, 2017 11:48 pm
Location: Lancaster Ky
Motorcycle: 1983 Gl1100 Interstate
1979 cb750k (sold)

Re: Knock knock, Time for new motor?

Post by Milkman_d83 » Fri Jul 21, 2017 12:24 am

Do u have a idea from what area on the motor the noise is coming from?

User avatar
Hoosier Jack
Posts: 409
Joined: Thu Oct 02, 2014 4:21 am
Location: Terre Haute, IN
Motorcycle: 1982 GL1100 Interstate

Re: Knock knock, Time for new motor?

Post by Hoosier Jack » Mon Jul 24, 2017 5:04 am

I would try a compression test first and see where your are. Let's go from there.

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DenverWinger
Posts: 424
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: Knock knock, Time for new motor?

Post by DenverWinger » Thu Aug 03, 2017 10:49 am

I don't think a compression test would really reveal the source of the knock.....

Back in '05 I was driving a 77 GL1000 with just a Windjammer on it. A friend of mine mentioned a GL1100 he'd bought that hadn't run in years. He left it with a "mechanic" who'd actually done more damage than good, still not running. By now he was pretty disgusted with the whole affair and offered to sell it to me for $300.

I wanted the full Vetter kit it had so I could put it on my GL1000, and I was just going to part out the 1100. But after a frustrating afternoon I determined the Vetter mount kit for the 1100 will not fit the 1000.

So I decided to see if there was any hope for the 1100.

Forget putting gas in the tank, it was half-full of something that you never want to smell again, and all rusted.

So I ran a fuel line from a 1 gallon gas can to the fuel pump, borrowed the battery from the 1000, and after a bit of cranking it actually fired up, more-or-less running on 3 cylinders, if I let the revs go below 2k it would stall, etc.

I noticed a knock when first starting that quieted right down as soon as the oil pressure came up, sounded like a rod knocking. No knock while running, just when first starting.

I put a couple hundred miles on it, just driving around town with the 1 gallon gas can in the trunk, carburetors "As-Is", no idle, running on three cylinders to decide if the knock was going to get worse and whether or not to put any more work into it.

Well, the knock remained unchanged, so I went ahead and fixed her up and put her on the road. I decided the knock was not the rod bearing on the crank, that wouldn't last very long, but was instead a wrist-pin knock.

That was with 58,000 on the clock. I sold the GL1000 a year later.

Fast-forward to today, 101,000 on the clock, still knocks on startup and quiets down when the oil pressure comes up, but I can tell the miles have taken their toll on that wrist pin. The start-up knocking is much louder than it was 43000 miles ago, and under certain load / RPM you can hear some knocking as you are driving.

So I figure it is a matter of time before that rod lets go, but who knows? Maybe another 20,000 miles?
They say 98% of all Hardleys ever made are still on the road..... The other 2% made it home. :lol:
(I stole this from somebody on another GW site...) :roll:

User avatar
BigSwede
Posts: 52
Joined: Fri Dec 02, 2011 11:26 pm
Location: Sunnyvale, CA
Motorcycle: 1983 Gl1100

Re: Knock knock, Time for new motor?

Post by BigSwede » Sun Aug 06, 2017 5:30 pm

Here are 2 videos I made today of the 1100 knocking. 1st is parked & revving up, you can hear it pretty good but it's really loud in 2nd one where I'm riding it







Current:
83 GL1100 Interstate
Past:
76 GL1000
74 Honda CB350
86 Honda Elite 250
85 Yamaha Riva 175
82 Yamaha Seca 650
76 Yamaha RD400

User avatar
DenverWinger
Posts: 424
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: Knock knock, Time for new motor?

Post by DenverWinger » Mon Aug 07, 2017 9:28 am

Sounds like mine, but louder. What we didn't hear in the videos is starting it up, waiting for the oil pressure lite to go out...
They say 98% of all Hardleys ever made are still on the road..... The other 2% made it home. :lol:
(I stole this from somebody on another GW site...) :roll:

User avatar
Hoosier Jack
Posts: 409
Joined: Thu Oct 02, 2014 4:21 am
Location: Terre Haute, IN
Motorcycle: 1982 GL1100 Interstate

Re: Knock knock, Time for new motor?

Post by Hoosier Jack » Fri Aug 11, 2017 7:29 am

Make sure that the carbs are synced before you go too much further. I replaced a motor on my 82 and looking back now, with a lot more experience, I am pretty sure that the "rod" knocking in my motor was actually the carbs out of sync, especially after changing the motor and still having a noise. These motors do clank around and tap so it is not unusual. It is a rather easy thing to do and if they are okay at least you have that out of the way.

User avatar
DenverWinger
Posts: 424
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: Knock knock, Time for new motor?

Post by DenverWinger » Fri Aug 11, 2017 8:32 am

+1 Carb Sync. These things are pretty rattley when they are out-of-balance.
They say 98% of all Hardleys ever made are still on the road..... The other 2% made it home. :lol:
(I stole this from somebody on another GW site...) :roll:

User avatar
BigSwede
Posts: 52
Joined: Fri Dec 02, 2011 11:26 pm
Location: Sunnyvale, CA
Motorcycle: 1983 Gl1100

Re: Knock knock, Time for new motor?

Post by BigSwede » Sun Jan 07, 2018 5:51 pm

Wow, almost 5 months! I finally got around to some more troubleshooting: I tried running it with each spark plug disconnected and when I got to #4, the noise stopped. So, something wrong with that cylinder, I'm thinking rod bearing?
Current:
83 GL1100 Interstate
Past:
76 GL1000
74 Honda CB350
86 Honda Elite 250
85 Yamaha Riva 175
82 Yamaha Seca 650
76 Yamaha RD400

User avatar
DenverWinger
Posts: 424
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: Knock knock, Time for new motor?

Post by DenverWinger » Sun Jan 07, 2018 10:55 pm

This could go back to the carb Sync again, if carbs are out of sync that one could be firing a little hotter than the rest....


They say 98% of all Hardleys ever made are still on the road..... The other 2% made it home. :lol:
(I stole this from somebody on another GW site...) :roll:

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