hesitates low end rpm any ideas? carbs?


Information and questions on GL1500 Goldwings (1988-2000)
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tech1
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hesitates low end rpm any ideas? carbs?

Postby tech1 » Sun Feb 19, 2012 2:16 pm



Hi everyone
Well yesterday I added an 88 1500 to my bikes. It has a bad hesitation. flat spot taking off and then goes ok at higher revs.
Anyone flamiliar with 1500 driveability? is rebuilding the carbs difficult? Or is there anything well known for this?
Thanks Tech1



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virgilmobile
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Re: hesitates low end rpm any ideas? carbs?

Postby virgilmobile » Sun Feb 19, 2012 10:03 pm

There are bunches of posts about the gl1500 carbs.Usually all the problems are associated with failing vacuum lines,carb slide,syncing,and idle mix adjustments.
My carbs needed all the things listed and took me a whole day of real work to get it right.The carbs are a real pain to get off.My 1100 and 1200 carbs come off in 45 minutes,the 1500 carbs took me 2 1/2 hours,and yea,you do have to drain the antifreeze too.
I found that there was a factory mod for the 88/89.It replaced the idle jet and the slide needle with a slightly different size to enrich the mixture a bit.I just opened the mix screw 1/2 turn and mine seems to be OK.
viewtopic.php?f=6&t=9804

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airpane
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Re: hesitates low end rpm any ideas? carbs?

Postby airpane » Mon Feb 20, 2012 7:16 am

Sounds like you have a non-functioning accelerator pump. Take off the radio and the top of the airbox. On the top of the carb venturis there will be two brass fittings sticking out horizontally from the inner part of the opening. These are the fittings that spray a stream of extra fuel in to the venturi opening when the throttle is opened. This extra fuel helps smooth out the change over from the slow speed jet to the highspeed jet as the motorcycle accellerates. Turn your throttle a few times and watch for a stream of fuel coming from the under side of the two brass fittings. If the accelerator pump is working there will be a small stream of gas squirting down into the top of the venturi. If not then some thing is stopped up or the diaphram inside the accellerator pump is bad, or the small carter key has come out of the linkage and the push rod is not attatched to the pump. The pump is located on the right rear side of the carbs. The bottm half of the airbox will need to be removed to get at the accellerator pump. Becareful not to break any of the hoses attatched to the air box while removing it. There are vaccume hoses on the right side and a crank case ventilation tube on the front right corner and in the middle on the rear side. Becareful not to drop anything down in the carbs as you remove the screws. It may be best to put a clean shop towel or paper towl down in to the top of each venturi before you start the removal of the airbox. Draw your self a map of the vaccum hoses noting the color of the stripes around the hoses for reasembly purposes. Or just take pictures with you cell phone as you go. If you go to cheap cycle parts and look at their schematics forthe fuel system you will have a better Idea of the lay out of the accellerator pump and parts. I hope this helps. If the bike idles smoothly and runs good at higher rpms this is probbably the culprit.

James "airplane" Harlan

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dingdong
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Re: hesitates low end rpm any ideas? carbs?

Postby dingdong » Mon Feb 20, 2012 8:49 am

The 88s, and I think 89s, had a well documented problem with hesitation. There is a timing trigger wheel that seems to solve the problem.

http://wingstuff.com/products/20358-tim ... ce_exhaust
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Mon Feb 20, 2012 11:18 am

Thanks for the info. I will check into the accel pump and reluctor wheel. It has been a long time since I have rebuilt a carb. feed back quadraad jets was the last ones . Being an automotive tech I like fuel injection. Too bad I couldn't fuel take it off my 86 SEi and put it on my 88. I never missed carbs when they went away. I've been wreching a long time but like fuel injection. I will keep you posted
Tech 1

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robb
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Re: hesitates low end rpm any ideas? carbs?

Postby robb » Mon Feb 20, 2012 12:05 pm

You failed to say if bike had been setting unused for a length of time. Might want to run some seafoam through fuel system before digging in. Mine set for 2 years anf after a couple tanks with seafoam cleared up.

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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Mon Feb 20, 2012 12:53 pm

He rode it a bit last year not much .
I'd say a few hundred miles is all last year

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Re: hesitates low end rpm any ideas? carbs?

Postby Bogator » Fri Feb 24, 2012 9:05 am

I don't like seafoam---go to the parts store and get some --chevron techron--put a bottle in and run for about half an hour--then let it sit overnite----then run the sh&%#! out of it and see if that clears it up---before you tackle the carbs--that is my suggestion---
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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Sun Feb 26, 2012 1:36 pm

I have seafoam in it now and also got Chevron Techron too. I am also going to do a vacume leak search if that doesn't cure it. I asked the previous owner when the timing belts had been replaced and he said he didn't and he has owned it since 98. I immediately ordered belts and the 4 degree reluctor wheel for while there. Need better weather to ride and get the seafoam throught it. Hope it warms up soon!
Tech1

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Re: hesitates low end rpm any ideas? carbs?

Postby dingdong » Sun Feb 26, 2012 5:12 pm

Bogator wrote:I don't like seafoam---go to the parts store and get some --chevron techron--put a bottle in and run for about half an hour--then let it sit overnite----then run the sh&%#! out of it and see if that clears it up---before you tackle the carbs--that is my suggestion---

Uh, um, sputter, sputter,cough, cough! Blasphemy I say! ;) ;)
Tom

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Re: hesitates low end rpm any ideas? carbs?

Postby WingAdmin » Sun Feb 26, 2012 8:32 pm

Hey, nothing wrong with his not liking Seafoam. I know it's fixed enough potentially expensive carb problems for me that I most definitely LOVE Seafoam. :)

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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Mon Feb 27, 2012 11:05 am

i have not used seafoam or techron before. I will try it first before going deeper just incase.
Tech1

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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Sat Apr 07, 2012 9:43 pm

Just rode today after cleaning the the carbs. Wow what a difference! 3 cans of seafoam and 3 cans of techron and little help. Nothing beats cans of carb cleaner and a old tooth brush and compressed air. I knew better but tried the Seafoam techron route. It is backfireing on RPM decel not bad though little more diagoising to do. Slowly but surely getting it all fixed right. Took it over to my freind the previous owner and let him ride it to see how it is suppose to run.
He was amazed.
Tech1

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Re: hesitates low end rpm any ideas? carbs?

Postby JohnCJK » Sun Apr 08, 2012 8:22 am

open your air/fuel mixture screw a bit to take care of the backfiring...

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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Sun Apr 08, 2012 6:01 pm

JohnCJK wrote:open your air/fuel mixture screw a bit to take care of the backfiring...


Hi John do you mean the Pilot screws with limiter caps? I did not take the caps off I put them back where they were.
Thanks Tech1

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Re: hesitates low end rpm any ideas? carbs?

Postby JohnCJK » Mon Apr 09, 2012 8:19 am

Yes the pilot screws
These are mainly responsible for your idle to 1/4 rpm range fuel supply.

Turn them to the close position without using force, count the number of turns.
then open them again and add 1/4 to 1/2 turn
do this for each carb.

Carbs should have the same number of turns.

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tech1
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Re: hesitates low end rpm any ideas? carbs?

Postby tech1 » Tue Apr 10, 2012 1:40 pm

I tried opening them up BUT it already seem rich It blows black smoke on reving it up and still popping a bit. I talked to the local dealer and he seems to think I have a vacume leak and rich??
Well the hesitation is gone. More digging!
Tech1

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Re: hesitates low end rpm any ideas? carbs?

Postby JohnCJK » Tue Apr 10, 2012 1:54 pm

Could be a vacuum leak or bad sparks.
Bad ignition will cause the fuel mixture to not burn.

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Re: hesitates low end rpm any ideas? carbs?

Postby 93Wing » Tue Apr 10, 2012 2:33 pm

On the right hand side of the bike while sitting on it there is a subfilter that you need to check. It has to do with the decel circuit that pumps air into the exhaust while on decel. Mine crumbled when I pulled it out. Change that subfilter along with the subfilter for the cruise control. I also had a vacuum leak on the lefthand side right at the rear of the intake. It was the line that you take off to hook up a vacuum gage to balance the carbs. And check the carb balance while in there.
I had the backfire on decel and the vacuum leak and filter change took care of that. Not sure if it was related but I had the hesitation and after all of the above it went away.




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