GL 1000 lack of higher speed power


Information and questions on GL1000 Goldwings (1975-1979)
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Beemor
Posts: 5
Joined: Thu Nov 26, 2015 9:41 pm
Location: Brockville Ontario Canada
Motorcycle: 1979 GL1000

GL 1000 lack of higher speed power

Post by Beemor »



I have a 1979 GL1000 and it runs very well but seems to not have a lot of top end acceleration that you would expect. On open highway running about 110 KPH(65 mph) at about 4000 rpm in 5th gear and go to hit it to pass this 18 wheeler and nothing, just very gradual increase in speed, not much pull at all. I've been told by local shop that this I kind of normal for this type of bike but don't know seems a bit dead to me. I've never had a 1000 before but other bigger wings and they didn't perform this way. Is this normal for this bike as was told? Thanks in advance for any help on this.

Beemor


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dingdong
Posts: 4025
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: GL 1000 lack of higher speed power

Post by dingdong »

That doesn't sound normal for your bike. 4000 rpm is where the power band starts. How does it accelerate in 4th gear at that speed? Should pull really strong. Sounds like you have a problem to me. I can pass easily from that speed riding two up and pulling my trailer with my 76. Carbs, points, spark, compression and or timing. How about a little history service of the bike.
Beemor
Posts: 5
Joined: Thu Nov 26, 2015 9:41 pm
Location: Brockville Ontario Canada
Motorcycle: 1979 GL1000

Re: GL 1000 lack of higher speed power

Post by Beemor »

Hi Tom

Just got the bike late last fall, is a reclamation project, carbs were rebuilt and synced, new spark plugs, all fluids and filters changed, timing belts done, valves reseated, electronic ignition replacing the points system, everything that can be changed and setup has been done supposedly(done by local bike shop not me), so can't think of anything else to change up on it. Haven't checked compression yet so will check that and see what's up there. I know the power band is in that 4000rpm range so it should pull hard in every gear right there but in 5th it doesn't just slowly up in speed. Other gears even 4th not as bad but it just doesn't seem to have that shoot out from under you acceleration. Buddy of mine had one of the first wings in my area a 1975 and let me ride it. I couldn't believe to go in that thing. Mines no where near that. Other than compression check anything else that should be looked at? Could the carb rebuilt not done properly cause this? Should that be checked? Thanks Tom

Bruce
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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: GL 1000 lack of higher speed power

Post by maintainer »

Maybe check fuel filter for blockage.
Or fuel pump for poor performance.
I suspect the fuel pump or fuel delivery somehow restricted or blocked.
I would rate low compression on down the list. Surprisingly, I've heard several report good performance even with compression as low as 100 psi per cylinder.
My 1000 comes on strong above 4k in any gear including 5th.
1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)
Beemor
Posts: 5
Joined: Thu Nov 26, 2015 9:41 pm
Location: Brockville Ontario Canada
Motorcycle: 1979 GL1000

Re: GL 1000 lack of higher speed power

Post by Beemor »

Hi Maintainer

Thanks for more info on this issue. More I talk to people about this more I realize this can't be normal for these bikes. I will look into every idea that I have been given and see what is causing this. If anyone can think of anything else please pass it on. Thanks

Bruce
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dingdong
Posts: 4025
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: GL 1000 lack of higher speed power

Post by dingdong »

Carbs could still be a problem. They are very picky when it comes to rebuilding. Go to http://www.Randakksblog.com for good info on gl1000 carbs as well as tech tips regarding tuning the gl1000. The 78/79s were slightly de-tuned (for better mpg) compared to the 75/76/77s so they aren't quite as speedy. Should pull hard through all the gears though.
Beemor
Posts: 5
Joined: Thu Nov 26, 2015 9:41 pm
Location: Brockville Ontario Canada
Motorcycle: 1979 GL1000

Re: GL 1000 lack of higher speed power

Post by Beemor »

Thanks Tom I'm beginning to suspect the carb rebuild may be the culprit. Everything suggested in this post has been looked at and completed except the carbs. That was supposed to be done by previous owner so maybe that's what should be checked next

Bruce
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swr1977
Posts: 206
Joined: Sun Sep 29, 2013 9:18 am
Location: Puyallup, Washington, USA
Motorcycle: 1978 Goldwing GL1000
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Re: GL 1000 lack of higher speed power

Post by swr1977 »

Sorry I'm a little late to the party here... Here is my thought... I purchased my '78 GL1000 three years ago this summer... Was told the first thing I needed to do was sync the carbs ... I didNOT do as told & rode for 2-3 months before syncing ... after the sync I noticed much faster throttle response! That would be the first thing I suggest checking & if you're so inclined to try it yourself here is a link to WingAdmin's how to!...viewtopic.php?f=11&t=81


For Some there's THERAPY, for the Rest of Us There are MOTORCYCLES
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