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Well hello im new to this site but i have read a lot of the forums similar to my problem but they were not exactly the same. My GL has a similar knock that of a rod bearing goin out but only does this when temperature of the motor is warmed up or if the outside temp is above 70 degrees. Also the only time that the motor will knock is under acceleration and if one or both of the previous conditions are present. Im thinking carb sync is off. I need to put a few other things into it yet but UPS moves too slow hehe. Id appreciate any input on my situation and i will get a pic up soon of my baby. Thank you!
 

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That's really difficult to diagnose over the internet but if it does it at more than 1/4 throttle, it's not the carb synch. First make sure the plug wires go to the right plugs.
 

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Try the sync first, you could also have a cylinder just along for the ride if there's an ignition or carb problem which can cause a knock.
The history of the motor and more details about the knock might help to come up with more ideas.

There are many knocking 1100's out there, you're not alone.
I've talked with many owners who have tried everything short of a rebuild with no improvement, these are still running strong. Most have been confirmed having low oil pressure but that wont stop these motors.
I'm not saying this is your problem, hopefully not.
Fine tuning can work wonders with engine noises, especially this flat 4 with it's slap happy primary chain.
 

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i'm thinking #4 carb lugging and needs to be totally rebuilt.

had 1 once sounded like going to throw a rod. ended up replacing carbs on that 1 and totally different bike.



mark:waving:
 

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Mine also sounded like it was going to throw a rod. Installed a Randakk carb kit, runs fine now (if a little rattly).

Check the condition of all four plugs. Sounds like one carb is not doing it's job.
 

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Welcome to the site Iroc,

I'm with the rest here. Make sure before you tear into the engine. That gets real expensive, real fast, and depending on the mileage, which you didn't list, may not be a bearing.

 

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I just got through having a very similar problem after getting some bad gas with a bunch of water in it. I drained the bowls and ran two tanks of clean gas with seafoam in it and then resynced my carbs.

I had tried to sync it before and had the number one carb unable to be synced. Right after that, I had to adjust the carb to get the bike to run somewhat smoother than it was.

When I tried to sync the carbs again after the seafoam, the carbs were way off and it took a couple of minutes to get the carbs synced. The rattle went away as soon as the number one carb got back into sync and I got the number three carb synced and the idle back to the proper range. The number one carb was bogging down the bike and I had idled it up higher than what was normal without realizing it.

You might get the same results, worth a try for sure before you do anything else other than a simple carb sync! I thought I might have a bent exhaust valve because of how it sounded and thought I might need a new motor.
 

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My carbs on my 83 Aspencade done the same thing. I done the carbs without a nanometer, as close as I could anyway, and got most of the knocking out. Soon as I get the new head gaskets on, I'm gonna do it with a nanometer. These engines can go under a lot of abuse, but check it and make sure nothing is very serious. They are great Bikes, and yet many are not broken in till around 100,000 miles. I also possibly could be a bent valve. I hope not, but if it's not too serious, ride it. But if your like the rest of us, you want the purr and power.
Good Luck!
Nightrider1
 

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Hey thanks alot guys for the replies. well i have the carbs out and there clean. Actually not what i was expecting. The syncro set screws for the carbs still have the original yellow glue on them so i know now they were never touched but did find in one carb that someone had put the wrong main jet in which is drilled out and the wrong part that the main jet crews into. Blasted if i could only remember the name of it, hehe.Probably the problem though huh?
 
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