HIGH SPEED R.P.M. BREAKDOWN


Information and questions on GL1500 Goldwings (1988-2000)
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sargentray
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HIGH SPEED R.P.M. BREAKDOWN

Postby sargentray » Mon Feb 15, 2010 8:28 pm



HI GOT A PROBLEM THAT IS ELUDING ME. HAVE A 1999 1500 WING SE WHILE OUT ON THE ROAD FOUND AN ISOLATED AREA TO OPEN HER UP TOWARDS 100 MPH AS THE BIKES BEEN SITTING FOR ALMOST A YEAR! YES I KNOW THAT ISN'T SMART, BUT I DON'T DO THAT ON A REGULAR BASIS. ANYWAY THE R.P.M. BREAKS DOWN AT ABOUT 95 M.P.H. AS IF I WAS EXCEEDING R.P.M. AT LOWER GEAR LIMITS. HAVE CHANGED PLUGS, AND AIR FILTER CHECKED FUEL PUMP, CHECKED EXHAUST PIPES FOR BLOCKAGE, JUST IN CASE BACK PRESSURE MIGHT BE PROBLEM, ADDED AN INJECTOR CLEANER AS A POSSIBILITY OF CLOGGED INJECTORS DOES ANYONE HAVE A IDEA FOR ZEROING IN ON THE PROBLEM? WILL BALANCE CARBS IN NEAR FUTURE.



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WingAdmin
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby WingAdmin » Tue Feb 16, 2010 3:36 pm

Fuel filter!

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MikeB
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby MikeB » Thu Feb 18, 2010 7:58 am

Bypass the fuel petcock and try it again. They do fail. It is just forward of the gas cap. Easy to bypass.
MikeB
Tacoma, WA, USA

maxtech7
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1982 Goldwing Interstate

Re: HIGH SPEED R.P.M. BREAKDOWN

Postby maxtech7 » Sun Feb 21, 2010 12:51 am

I had this problem on my '82/1200 wing and after much searching found it to be the fuel filter.

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MikeB
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby MikeB » Sun Feb 21, 2010 2:21 am

Yes, I saw that replacing the fuel filter was one of the suggestions. I just wanted to make sure that he knew about the fuel petcock as well. It does fail and it does give the same symptoms as a clogged fuel filter.

MikeB
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WingAdmin
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1982 GL1100A Aspencade (sold)
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby WingAdmin » Sun Feb 21, 2010 7:45 pm

Anything that restricts fuel flow can cause it. With a specific fuel flow, the engine will have enough, but at high speed and high RPM, when fuel requirements are highest, the restricted fuel flow will cause the engine to starve for fuel. A dirty fuel filter is a common cause, as is a failing petcock, dirt or residue in a pickup, blockage in carbs...any number of things. Fuel filter is a good (and cheap) place to start, though.

Gordwing
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby Gordwing » Sat Oct 11, 2014 11:08 am

Thanks for all the advice. Today I will change the fuel filter and test the fuel pump flow.The manual shows a drawing of the engine control unit connector but I can't find it beside the fuel tank under the right inside fairing cover? I want to jump the black/blue and black/white wires. Anywhere else I can find an actual picture ?

Gordwing

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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby WingAdmin » Sun Oct 12, 2014 9:28 am

Gordwing wrote:Thanks for all the advice. Today I will change the fuel filter and test the fuel pump flow.The manual shows a drawing of the engine control unit connector but I can't find it beside the fuel tank under the right inside fairing cover? I want to jump the black/blue and black/white wires. Anywhere else I can find an actual picture ?

Gordwing


It's pretty tough to miss, it's the biggest thing there:

Engine Control Module
Engine Control Module

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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby Gordwing » Tue Oct 14, 2014 6:10 am

I agree, thanks.....it's that I cannot find a black/white and black/blue wire to jump. I'll try again with a magnifying glass.
Do you happen to know where I can get the vacuum pump they describe for checking the fuel pump,besides Honda ?

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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby Gordwing » Wed Oct 15, 2014 5:34 pm

OK I found it and now my manual says to disconnect the control unit but I cannot. So whats the trick

Gordo

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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby WingAdmin » Thu Oct 16, 2014 9:58 am

Gordwing wrote:OK I found it and now my manual says to disconnect the control unit but I cannot. So whats the trick

Gordo


It's been a while since I did this, but I remember there are tabs you either have to squeeze or expand in order to unlock the locking mechanism before removing the connector. Mine were stuck from years of being locked in place, when this is the case a lot of the time you can get them to unlock by squeezing/expanding/whatever the tabs, and pushing INWARD on the connector, while rocking it back and forth slightly. Once the tabs release, you can then pull the connector off.

I lived in Orangeville for a year, if I was still there I'd drop by and help you with it. :) :)

Gordwing
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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby Gordwing » Thu Oct 16, 2014 11:41 am

Thanks. I figured it out last night. You're right,I had to squeeze to get the cover off and then squeeze the yellow plug at the back to get it off. I did the fuel pump test and its ok so now I do the fuel regulator test with a vacuum pump.

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Re: HIGH SPEED R.P.M. BREAKDOWN

Postby Gordwing » Sun Oct 19, 2014 8:39 am

OK,I did the fuel regulator test and the vacuum slowly came down from 200 mm to 100 in about 30 minutes. Is that a pass or does it mean absolutely no dropping in the manual.I checked my hose connections to my cheap little vacuum pump,but there could be a slow leak somewhere.




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