Funny noises after carburetor reinstallation


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shevik
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Funny noises after carburetor reinstallation

Post by shevik » Wed Oct 09, 2019 1:10 am



Hello again Goldwingers!

I'm at it again with my carburetor saga. So I reinstalled it tonight after taking a lot of time to get it cleaned up and bench synced (with the help of this community, for which I am incredibly thankful and looking forward to the day when I have more answers than questions)

When I started the bike up for the first time tonight it just didn't sound right. I've included a link to a video of the noises in question, any insight into what I might have done wrong would be much appreciated.





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Rambozo
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Re: Funny noises after carburetor reinstallation

Post by Rambozo » Wed Oct 09, 2019 2:03 am

Are all cylinders firing? Check the head pipes for equal heat.

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julimike54
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Re: Funny noises after carburetor reinstallation

Post by julimike54 » Wed Oct 09, 2019 8:00 am

Adjusted the valves?
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Maz
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Re: Funny noises after carburetor reinstallation

Post by Maz » Thu Oct 10, 2019 5:32 am

Sounds like something is touching a spinning object, like the Water pump impeller. Or might you have accidentally dropped a nut or washer into the open intake port while the carbs were off?

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OldguyGlen
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Re: Funny noises after carburetor reinstallation

Post by OldguyGlen » Thu Oct 10, 2019 10:27 am

+1 on the dropped something down the intake port ?? If you didn't maybe the PO did while messing with the single carb conversion. Or maybe +1 on the valve adjust.
Did the bike ever run while in your possession? Did it run well enough to even let you notice the ticking sound, especially if you were unfamiliar with the bike at the time? Another possibility is a timing belt off a couple notches. Valves might touch the piston, but not yet be catastrophic.
Can you crank it over by hand (remove cap over the stator axle at the left rear of the engine, and insert wrench). See if you can feel an interference, or hear the tick, to help identify location. Remove the plugs to permit easy, smooth rotation.

shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Thu Oct 10, 2019 4:37 pm

A small washer I believe is an outside possibility but a possibility nonetheless. I kept the valves pretty well plugged while the bike was sitting, but it could have happened while I was putting the carb back on.

The bike never made the chattering noise with the single carb on when I could get the thing to maintain an idle, it did run though. I drove it home when I bought it.

What are the chances that the noise could be happening because of improperly adjusted jets? I reviewed the guide I was using and came to the conclusion that I may have closed the idle jets on accident.

The only other work I've done to the bike is flushed the radiator (distilled water inside right now, can't complete the job until the bike maintains a healthy idle), changed orings on the thermostat pipes, and changed the handle bars.

shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Thu Oct 10, 2019 4:47 pm

Furthermore, what kind of nightmare am I looking at if I dropped something down a valve :|

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Overdog
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Re: Funny noises after carburetor reinstallation

Post by Overdog » Thu Oct 10, 2019 6:09 pm

I did exactly that///dropped a screw from one of the intake clamps. It made a few loud snapping sounds...then got under the valve. Bent valve, cracked valve guide and $200 for the machine shop to rebuild the head.

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Overdog
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Re: Funny noises after carburetor reinstallation

Post by Overdog » Thu Oct 10, 2019 6:10 pm

Easy enough to check...just pull and replace the intake tubes one at a time...no need to pull the carbs.

shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Thu Oct 10, 2019 6:21 pm

I'll be able to see just by shining a light down each cylinder?

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Overdog
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Re: Funny noises after carburetor reinstallation

Post by Overdog » Fri Oct 11, 2019 5:32 am

Yes and no.... the intake clamp screw that I dropped wouldn't make it all the way past the valve...a small washer might make it all the way into the cylinder

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Maz
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Re: Funny noises after carburetor reinstallation

Post by Maz » Fri Oct 11, 2019 9:00 am

Just listened to the video again and I'm thinking what OldguyGlen mentioned is a distinct possibility - check the cam timing and, if you haven't already, put two new belts on.
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shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Fri Oct 11, 2019 3:16 pm

It seems unlikely to me that something would have happened to one of the belts in the two weeks or so it sat without carbs on it, but I suppose anything is possible!

My next step when I have a day off is to pull the carbs again, double check my work with the jets even though I don't know if improperly adjusted jets could produce a chattering like that, and to check for a lost washer with my trusty endoscope.

I'm getting so used to pulling the carbs off this thing that I think I'll make a how-to guide for the forum. :D

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Re: Funny noises after carburetor reinstallation

Post by indianakid » Fri Oct 11, 2019 3:51 pm

just want to check the easy stuff first.... are you sure that the plug wires are correct? not swapped on one side ???

shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Fri Oct 11, 2019 5:35 pm

This easily could have happened. Can you explain to me what kind of effect it would have?

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Maz
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Re: Funny noises after carburetor reinstallation

Post by Maz » Sat Oct 12, 2019 1:39 am

shevik wrote:
Fri Oct 11, 2019 3:16 pm
It seems unlikely to me that something would have happened to one of the belts in the two weeks or so it sat without carbs on it, but I suppose anything is possible!

My next step when I have a day off is to pull the carbs again, double check my work with the jets even though I don't know if improperly adjusted jets could produce a chattering like that, and to check for a lost washer with my trusty endoscope.

I'm getting so used to pulling the carbs off this thing that I think I'll make a how-to guide for the forum. :D
I know it's unlikely, but it's possible - If the belts are slack/old, it's very possible that they may jump a tooth or more whilst cranking the engine over to start it. You want to check the simple things first?...well checking cam timing is one of them.
Maz
Ironically, Common Sense is the LEAST common of all senses!

shevik
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Re: Funny noises after carburetor reinstallation

Post by shevik » Sat Oct 12, 2019 6:58 pm

Maz wrote:
Sat Oct 12, 2019 1:39 am
shevik wrote:
Fri Oct 11, 2019 3:16 pm
It seems unlikely to me that something would have happened to one of the belts in the two weeks or so it sat without carbs on it, but I suppose anything is possible!

My next step when I have a day off is to pull the carbs again, double check my work with the jets even though I don't know if improperly adjusted jets could produce a chattering like that, and to check for a lost washer with my trusty endoscope.

I'm getting so used to pulling the carbs off this thing that I think I'll make a how-to guide for the forum. :D
I know it's unlikely, but it's possible - If the belts are slack/old, it's very possible that they may jump a tooth or more whilst cranking the engine over to start it. You want to check the simple things first?...well checking cam timing is one of them.
Maz
Yeah you're right Maz. Thanks for talking some sense into me. It did take a while to turn the engine over because the carbs were dry when I put them on. If they're old belts that's when it would have happened.

I'll hopefully have an answer for all of you on Tuesday next week. I have a couple days off in a row and a bag of tools. I've been itching to take a look all week! :D



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