Sudden Poor Performance..


Information and questions on GL1000 Goldwings (1975-1979)
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spookytooth
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Location: Houghton Lake, Michigan
Motorcycle: 1979 gl1000

Sudden Poor Performance..

Postby spookytooth » Tue May 27, 2014 7:55 pm



I put a little over 300 miles on the Honduh Sunday. On my way home as I was turning a corner the bike sounded like it was only firing on three cylinders. It seemed to idle ok and when I pulled one plug wire at a time each time the bike stalled so it would seem the electrics are okay... It seems most prevalent under load while accelerating... Shift into 3rd and it barely accelerates at full throttle. Here's where it gets weird.. If I keep accelerating in 3rd up to 7k rpm, all of a sudden it takes off like a rocket! It kind of feels like the engine running with the fuel petcock shut off.. Until it hits 7k ...

Any ideas?



grthwyn
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Re: Sudden Poor Performance..

Postby grthwyn » Tue May 27, 2014 9:06 pm

carbs synched? thats what caused mine to do that at lower rpms, one of the nuts on the adjustment vibrated loose and i fixed it with some low power lock tite

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Fred Camper
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Re: Sudden Poor Performance..

Postby Fred Camper » Tue May 27, 2014 9:24 pm

Electronic ignition going soft. High rpm needs less energy to ignite the mixture. So I would be sure of the electrical first as seldom does a carb issue come and go so quick.

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WingAdmin
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Re: Sudden Poor Performance..

Postby WingAdmin » Tue May 27, 2014 9:33 pm

Fred Camper wrote:Electronic ignition going soft. High rpm needs less energy to ignite the mixture. So I would be sure of the electrical first as seldom does a carb issue come and go so quick.


Yup, what he said. When under load, it takes more energy to ignite the mixture, so electrical issues will come to the forefront - it might run fine most other times, but under hard acceleration it misses and sputters.

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spookytooth
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Re: Sudden Poor Performance..

Postby spookytooth » Tue May 27, 2014 9:40 pm

I happen to have a brand new electronic ignition and coil set. I bought them when I got the bike and when I cracked open the rotor I found it already had one. I think the coils are oem.

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spookytooth
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Re: Sudden Poor Performance..

Postby spookytooth » Thu Jul 03, 2014 8:12 pm

So... It's been a long road since I started this thread.. First I changed out the coils. It had stock coils and I replaced them with Dynas, no good. I then replaced the Dyna S with another Dyna S, no good. Next, I blew the right head gasket and I thought AHA! But... No good. So... It's got to be the carbs, right?

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Fred Camper
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Re: Sudden Poor Performance..

Postby Fred Camper » Thu Jul 03, 2014 9:52 pm

Sticky sliders? When you get to 7K then the slider finally moves. No need to pull the carbs if that is all that is wrong. But while you are at it...

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spookytooth
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Re: Sudden Poor Performance..

Postby spookytooth » Thu Jul 03, 2014 9:56 pm

Well I shouldn't say nothing has changed... It seems to "chug" below half throttle now. Open it up and once it gets above 3.5 - 4 k it smooths out and takes off..

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Fred Camper
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Re: Sudden Poor Performance..

Postby Fred Camper » Fri Jul 04, 2014 9:34 am

I do not recall if you have had those carbs out yet. But seems like that is now the mostly likely issue. Certainly not clear what is going on, but the ignition does not seems like a issue anymore.

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spookytooth
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Re: Sudden Poor Performance..

Postby spookytooth » Fri Jul 04, 2014 3:13 pm

I haven't had the carbs off. The further into this I get the more I'm considering doing the Webber conversion...

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Fred Camper
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Re: Sudden Poor Performance..

Postby Fred Camper » Fri Jul 04, 2014 10:05 pm

Weber is cool but pricey. They scoot fine but use more fuel and loose a bit of torque down low. Rebuilding these is not that bad, and with regular riding or use of marine sta-bil they just keep on going. So the choice is yours either way.




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