Issue with cutitng out after on the road at high speeds


Information and questions on GL1100 Goldwings (1980-1983)
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RBGERSON
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Issue with cutitng out after on the road at high speeds

Postby RBGERSON » Thu Oct 16, 2014 8:53 am



Trying to help a guy with this issue.

Carbs have been redone, tank clean, tubes clean out too, filter replaced, spare coils tried, gas cap loosened, fuel pump tested, So what else??

The bike idles fines and runs fine for a few minutes until taken on the highway at high speeds after few minutes seems like two cylinders drop out..when checked for spark it's there.

any ideas??


HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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virgilmobile
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Re: Issue with cutitng out after on the road at high speeds

Postby virgilmobile » Thu Oct 16, 2014 9:14 am

If you can back off the throttle a bit and it recovers then quits shortly again as you throttle back up,you may simply not be getting enough fuel.Especially if the low demand yeilds a smooth engine.

loosen the gas cap to test for a vacuum(plugged check valve).test run with it loose.
Flow test the fuel pump by the book.make sure it is providing enough fuel to the carbs.
Another possibility...
Look with a mirror in the plenum box at each slide as you rap the throttle.All 4 of must slide up and down .i had one sticking that caused a flat spot around 3500 rpm.one cylinder was fuel starved.

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littlebeaver
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Re: Issue with cutitng out after on the road at high speeds

Postby littlebeaver » Fri Oct 17, 2014 7:01 am

If you have the 4 gauges to sync the carbs, hook them up and watch the gages as you throttle up, it may give you a idea which carb is misbehaving or not getting proper fuel, sticking or whatever.... :D

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RBGERSON
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had every year from 75 to 83

Re: Issue with cutitng out after on the road at high speeds

Postby RBGERSON » Fri Oct 17, 2014 7:49 am

Thanks for the ideas..anymore??
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

moritz1100
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Re: Issue with cutitng out after on the road at high speeds

Postby moritz1100 » Fri Oct 17, 2014 10:50 am

Could be a bad cdi unit, if you knew which 2 cylinders stop firing at higher speeds when the unit heats up you could swap them over to see if the problem moves to the other 2 cylinders. Try pulling the ht leads off the plugs while driving, should be obvious when you remove a ht lead from one of the 2 remaining good cylinders. Then swap the cdi units around and see if the problem moves to the other pair of cylinders. Or replace both units if you have some spare ones..

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HawkeyeGL1200
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1981 GL1100 Interstate

Re: Issue with cutitng out after on the road at high speeds

Postby HawkeyeGL1200 » Fri Oct 17, 2014 12:21 pm

Are the two cylinder that are cutting out on the same side or opposite side? If it's same side, I would suspect the fuel system.. if they share a coil, then I'd look for a loose wire, or a coil with weak windings that may be grounding when it gets warm... maybe even a crack in the coil.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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RBGERSON
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had every year from 75 to 83

Re: Issue with cutitng out after on the road at high speeds

Postby RBGERSON » Mon Oct 20, 2014 8:04 am

FYI problem solved..valves set too tight..caused this. Guy said too tight = too hot when running at high speeds so lost compression and cylinders..reset and all's well. Never heard of that before but it fixed his issue..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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HawkeyeGL1200
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1981 GL1100 Interstate

Re: Issue with cutitng out after on the road at high speeds

Postby HawkeyeGL1200 » Mon Oct 20, 2014 8:16 am

That's good information to know... one more thing to check off the list of things to check when dealing with a strange problem!

RBGERSON wrote:FYI problem solved..valves set too tight..caused this. Guy said too tight = too hot when running at high speeds so lost compression and cylinders..reset and all's well. Never heard of that before but it fixed his issue..
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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WingAdmin
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Re: Issue with cutitng out after on the road at high speeds

Postby WingAdmin » Mon Oct 20, 2014 9:39 am

RBGERSON wrote:FYI problem solved..valves set too tight..caused this. Guy said too tight = too hot when running at high speeds so lost compression and cylinders..reset and all's well. Never heard of that before but it fixed his issue..


Definitely heard of this. Valves when cold need specific amount of clearance. This is to allow for expansion of the valve when it gets hot. If the valve is set too tight, when the engine gets hot and the valve expands, it no longer seats completely. The result is that exhaust blows by the slightly unseated valve, losing compression and power. The exhaust blowing by heats the valve even more, which makes it expand more, which opens up the seal more, which lets more exhaust by...and so on. Eventually the end result is burned valves and/or valve seats. You can also end up with worn cams, as the valve is putting excessive pressure on the cam lobe when there isn't meant to be.

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littlebeaver
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Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: Issue with cutitng out after on the road at high speeds

Postby littlebeaver » Tue Oct 21, 2014 12:16 am

Wow, you rarely hear about this.... That's a good one... :D Wonder why they were set like that...




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