Knock In Engine - PLEASE HELP

Information and questions on GL1100 Goldwings (1980-1983)
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Motorcycle: 1983 Goldwing gl1100i interstate

Knock In Engine - PLEASE HELP

Postby DetroitLionWing » Sun Aug 05, 2012 1:03 am

First Time Poster And Glad I Stumbled Across This Site. U Guys Have Helped Me Immensely With My Repairs Thus Far. I Just Put A Starter On My Bike And Now Am Getting A Knock On The Left Side. Shes Idling Rough And Really Starts Knocking At About 80. Seems To Really Dog Out And Not Much Climb Once It Hits About 70 Or 75. Ive Read That My Carbs May Need To Be Synced And Any Feedback On Possible Causes Or Issues that May Be Helpful Would Be Appreciated. Just Bought The Bike About A Month Ago And Am Planning a Trip In two Weeks. Would Love To Have This Issue Resolved By Then So Please Help. Also No Sign In The Coolant That The Head Gasket Has Blown.

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Re: Knock In Engine - PLEASE HELP

Postby eklimek » Sun Aug 05, 2012 7:52 am

The rough idle and lack of top end speed is likely carburetion issue. Even so it will tend will smooth out at higher speed. The multiple recommendations of carb cleaners is hard to argue against but is no substitute for dissassembly and refurbishing.

The knock that increases with power or speed is troublesome. A bottom end knock may be accompnied by low oil pressure. Piston slap improves with temperature.

Compression test before rebuilding carbs. If oil pressure still good with one bad cylinder compression, then time to check valve train. As virgilemobile pointed out, compression test with wide open throttle.

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Re: Knock In Engine - PLEASE HELP

Postby DetroitLionWing » Sun Aug 05, 2012 5:27 pm

not sure if the knock is worse at the higher speed but it seems to be more frequent i believe. gonna take it out here in a few and will update in a bit. looked at the diy carb sync and think i could manage it. also just replaced throttle cables and thats why im inclined to believe may just be out of sync. ill keep u posted and thanks for the advice.

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Re: Knock In Engine - PLEASE HELP

Postby seabee_ » Sun Aug 05, 2012 11:16 pm

Start with the simple things first. Do a carb sync on it and see if that eliminates the knock and improves the performance of the engine at higher speeds. If the carbs are unbalanced it will cause the rough idle and the knock especially at low rpms.
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Re: Knock In Engine - PLEASE HELP

Postby Wingsconsin » Mon Aug 06, 2012 9:18 am

Do your valve adjustments (read the "how to" section).
Then do the carb synch - it will help with the low end knock
I had a similar rattle on low end acceleration and the synch cleared most of it.
I have a manometer (carb synch tool) if needed you could swing by someday...
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Re: Knock In Engine - PLEASE HELP

Postby dingdong » Mon Aug 06, 2012 12:29 pm

Carb sync will only effect the idle. Any knock above idle isn't a sync problem.

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Re: Knock In Engine - PLEASE HELP

Postby scotterichmond » Mon Aug 06, 2012 2:27 pm

these bikes are so easy if you just resolve your self to the proper order of inspections/ adjustments.Short cuts will just waste time, unless you know the history.
ignition stuff has to be right, then carbs have to be clean( spotless) and the carbs need to be adjusted right ! if all that is correctly done. she will run great at all throttle positions.

Just my 2 cents worth,has worked good for me.

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