power loss above 4K rpm


Information and questions on GL1100 Goldwings (1980-1983)
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Mariner
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power loss above 4K rpm

Postby Mariner » Sun Feb 03, 2013 1:29 pm



Hi folks, I am not a mechanic by any stretch of the imagination but I can follow instructions. Anything complicated I have the local Honda shop fix it. I am simply looking for a place to start. My bike is an 83 Goldwing Interstate 1100.

Out for a ride this week and noticed that every time I got a little past 4000 rpm I would lose power. At lower rpm she runs fine. Idle is steady and throttle response is as it should be with no hesitation below 4000 rpm.

This bike was not well maintained before I got it and has taken much work and money to get it to where it is safe to ride. I believe it has about 45,000 original miles on it, (speedometer broke a couple of months back and none of the replacements I've purchased work), and I am not assuming anything like a normal maintenance routine in the past. Before the "bogging" down symptom I did replace my throttle cables and had to unseat and move the carburetors as per the excellent instructions on this site. Bike ran normally and powerfully afterwards so I'm hoping I didn't mess anything up doing that. I'm thinking maybe something in the fuel system?

Thanks in advance for any help.


"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755

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RBGERSON
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Re: power loss above 4K rpm

Postby RBGERSON » Sun Feb 03, 2013 3:21 pm

Could be a lot of things..related to fuel flow..floats set too high so at high rpm's they starve the engine, fuel pump/filter issues reducing flow..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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Mariner
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Re: power loss above 4K rpm

Postby Mariner » Sun Feb 03, 2013 3:30 pm

I had the carbs rebuilt about a year ago. I don't recal if the fuel filter was repalced at the time or not but after reading the diy article on the fuel filter I'm wondering if the original rubber fuel lines aren't part of the problem. I'm heading out to get a fuel filter and some new fuel lines. It's an easy first step and eliminates it as a cause.
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Re: power loss above 4K rpm

Postby virgilmobile » Sun Feb 03, 2013 3:38 pm

It does sound like fuel starvation. On my 83 it was 2 slides sticking closed.
Use a angled mirror in the plenum and rap the throttle.watch for each slide to jump as the rpm is rapped up.

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Re: power loss above 4K rpm

Postby WINGER3 » Sun Feb 03, 2013 3:49 pm

I agree with RBGERSON and virgilmobile it's a fuel problem.

I think you have a speedometer cable problem also, or speed gear in the front wheel hob where the cable connects. You said you bought a couple gauges and none work, that is why I think you have a cable problem. Some times the nut holding the cable to the speed sensor is loose or cable is broken, if not then the sensor gear is wore out from moister, sand, or no lube. Hope this helps. Bob :mrgreen:
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Mariner
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Re: power loss above 4K rpm

Postby Mariner » Sun Feb 03, 2013 4:26 pm

Allright! Thanks - I'll look at the slides as soon as I find my inspection mirror. I'll check the speedomenter cable and the speed sensor too. With a little luck maybe one of the used speedos I bought might work. It would be nice to actually know how fast I'm going - let you guys know when I get done checking all this.
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755

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Mariner
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Location: San Diego, CA
Motorcycle: 2003 GL1800 (current),
1983 GL1100 Interstate (last), Z1000, CB750F, CB750K, CB550, 450 scrambler, 90 Scrambler, and a few I've forgotten

Re: power loss above 4K rpm

Postby Mariner » Sun Feb 03, 2013 9:13 pm

Replaced the fuel lines and fuel filter IAW the diy article - worked really well, checked the gas tank cap - ok, still bogs down over 4K in 5th. I get slightly better performance if I down shift and run around 5K rpm...
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755

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WINGER3
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Re: power loss above 4K rpm

Postby WINGER3 » Mon Feb 04, 2013 12:44 am

Mariner wrote:Replaced the fuel lines and fuel filter IAW the diy article - worked really well, checked the gas tank cap - ok, still bogs down over 4K in 5th. I get slightly better performance if I down shift and run around 5K rpm...


If you can run 5K+ in 4th, I would do a compression check, at 4K+ in OD you might just not have enough HP because of low compression to get more RPM. Air flow and fuel flow at 5K is the same in 5th (OD) or 4th, HP is the only difference other then valve lash settings are to tight for full compression. Since my wife tells me I'm allways wrong, she might be right. That's my answer and I'm sticking to it. Good luck. Bob :mrgreen:
DON'T DESTROY IT-RESTORE IT

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Mariner
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Joined: Mon Oct 08, 2012 10:02 pm
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Motorcycle: 2003 GL1800 (current),
1983 GL1100 Interstate (last), Z1000, CB750F, CB750K, CB550, 450 scrambler, 90 Scrambler, and a few I've forgotten

Re: power loss above 4K rpm

Postby Mariner » Mon Feb 04, 2013 3:46 am

Thanks Bob - I'll check it out.
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755

User avatar
Mariner
Posts: 29
Joined: Mon Oct 08, 2012 10:02 pm
Location: San Diego, CA
Motorcycle: 2003 GL1800 (current),
1983 GL1100 Interstate (last), Z1000, CB750F, CB750K, CB550, 450 scrambler, 90 Scrambler, and a few I've forgotten

Re: power loss above 4K rpm

Postby Mariner » Sun Mar 03, 2013 7:28 pm

Okay - sorry so long between posts. Had to make a couple of business trips. Meantime, after less than 5 miles on the new fuel lines and fuel filter, which may have nothing to do with the problem, the bike started running like it's supposed to. I ran the tank down to pretty much nothing - no debris, screen clear. Running mostly Chevron premium - I get a little knock on regular, never tried the middle grade. Compression good (one cyl a tiny bit low but still okay). Guess I'll wait until it comes back. Thanks for the help.
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755

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WINGER3
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Re: power loss above 4K rpm

Postby WINGER3 » Sun Mar 03, 2013 8:46 pm

Hi Mariner; what was the compression on each cyl,? You should be using just reg. grade 87, if you get pinging the carb's are way to lean, which means loss of power, my carb's are all at 155 psi ea, and have no ping what so ever, unless you are not getting any advance, which can cause the same problem. You will need to check the timing and run it up to 3100rpm + to check to see if it is advancing. Good luck Bob :mrgreen:
DON'T DESTROY IT-RESTORE IT

User avatar
Mariner
Posts: 29
Joined: Mon Oct 08, 2012 10:02 pm
Location: San Diego, CA
Motorcycle: 2003 GL1800 (current),
1983 GL1100 Interstate (last), Z1000, CB750F, CB750K, CB550, 450 scrambler, 90 Scrambler, and a few I've forgotten

Re: power loss above 4K rpm

Postby Mariner » Sun Apr 14, 2013 4:58 pm

Been wondering about having to use premium. I'll have my Honda mechanic check the timing and re-check the compression. For now still running really good. Lot's of power, good throttle response.


"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." Benjamin Franklin, 1755


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