4th gear thump, GL1500 - Steve Saunders Goldwing Forums

 
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post #1 of 10 (permalink) Old 10-14-2006, 10:15 AM Thread Starter
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I have noticed on my '90 1500 that when I am in 4th gear coasting and I roll on the throttle, it feels like the bike is taking up slack out of the drive shaft or rear differential. I cannot duplicate this in any other gear; it only occurs in 4th gear. For example, if I am riding in 4th gearand traffic slows I let off the throttle. As I accelerate, I feel a little "thump" from the drive train.

I thought that there was a previous thread on this but I cannot find it. I'm not stressing about this; it doesn't feel strong enough that it's causing a problem it is just that with the smooth riding bikes, you notice things like this.

Ruaidh

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post #2 of 10 (permalink) Old 10-14-2006, 10:25 PM
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I don't have an answer for you, and this will put you back to the top but I'm willing to bet that to fix it you have to pull the seat.

Mike
Now in limbo trying to decide what I want to get.
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post #3 of 10 (permalink) Old 10-16-2006, 08:19 AM Thread Starter
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fatalattraction wrote:
Quote:
I don't have an answer for you, and this will put you back to the top but I'm willing to bet that to fix it you have to pull the seat.
hehehe

Yeah, I have no doubt.

To know what is right and not act accordingly is the worst cowardice. - Confucius

Words, unwritten, have no value. - Caius Merlinus Brittanicus

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post #4 of 10 (permalink) Old 07-07-2009, 06:35 PM
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i feel it on mine in 4th and 5th , really any gear. im so glad to find at least one person who has felt this.



all i have to do is go about 45 mph in 5th and gently roll off the throttle and i feel a light bumping in the forward pegs, and if i roll off completly, and rol on i feel it as one thump, i think exactly as you said. will do in 4th as well. a little in third and not noticable anymore in lower gears.

'maybe normal??



did you ever find a cause or just keep on riding it?


Just my 1.99 cents
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post #5 of 10 (permalink) Old 01-29-2010, 07:30 PM
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fixed this later on by replacing the u-joint. couldnt see what the problem was as it looked fine, but the used one from ebay stopped 90 percent of the slack feeling. just thought I would update this in case it helps somebody else.

Just my 1.99 cents
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post #6 of 10 (permalink) Old 01-29-2010, 09:08 PM
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Hope it is something simple. A couple of places to check might be the rubber dampners inside the rear wheel that absorb shock from shifting. Might pull the drive shaft out and check the front and rear splines. How is the rubber boot over the front of driveshaft? If it is gone, might lead to the U joint failure.
Tom Bishop
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post #7 of 10 (permalink) Old 01-30-2010, 05:51 AM
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There is some freeplay in the drive line. I doubt it's something to be concerned about. Mine seems like an inch or two at the wheel.

But it doesn't hurt to look at the U-Joints, the drive shaft splines, the rear drive and the rear wheel splines and dampener as has already been mentioned. If you haven't been in there in a while, it's as good a time as any to do so and moly paste those splines.




Rudy

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post #8 of 10 (permalink) Old 01-30-2010, 07:55 AM
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i had the same prob in 4th gear only lasted a couple of months then the dreded 4th gear selector fork rattle kicked in after that engine out split in two 2,000euro fixed

Peter

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post #9 of 10 (permalink) Old 01-30-2010, 08:18 AM
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Like I said. I hope its something simple. Just before the transmission gave up on my old `91 Aspencade, it would have a strange lurch when downshifting from 5th, to 4th. You don`t mention if you have floorboards, with a heel/toe shifter.
Tom Bishop
`98 S.E.
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post #10 of 10 (permalink) Old 01-30-2010, 09:43 AM
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so what is the dreaded 4th gear selector rattle you mention? what does that sound / feel like and when do you notice it? is it something you feel in the shifter or what exactly? and what year bike was this on, i heard some years had problems with 4th and an "improvement was made"

Just my 1.99 cents
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