hesitation when trying to keep a constant speed


Information and questions on GL1100 Goldwings (1980-1983)
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Acces-wild33
Posts: 7
Joined: Sun Aug 24, 2014 3:06 pm
Location: Racine wi
Motorcycle: 1980 honda goldwing 1100

hesitation when trying to keep a constant speed

Postby Acces-wild33 » Wed May 13, 2015 8:56 pm



Hi everyone I'm having problems trying to keep a constant speed. When I get to the speed limit my bike starts to pop and back fire but once you start to accelerate that goes away. The bike has been sitting for a long time and I just had to get a new battery for it. I also just put some seafoam in the tank with a fresh tank of premium gas. It has been popping before I put the seafoam in the tank. I put new spark plugs in it and only put 20 miles on it and this is what they look like. Please help me and I appreciate the help so far.

Thanks
Nate
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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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81 GL1100
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83 GL1100 I
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Re: hesitation when trying to keep a constant speed

Postby virgilmobile » Thu May 14, 2015 1:50 pm

Too much unburnt fuel.
Step1.compression test.Wide open throttle.ignition killed,all 4 plugs removed.Expect above 130 PSI with no more than 5 PSI difference.
Step2.Voltage test at 3000 RPM.It should be above 13 volts but not over 14.4 volts.
Step 3.Stick a mirror in the bottom of he plenum box.Rap the throttle and verify that each slide moves from the closed position to about 1/3 to 1/2 way up and go back down at a idle.

Verify the air cleaner is not obstructed.
Sync the carbs.

This is assuming that all 4 plugs are the same way.

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CMReynolds1
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Location: Oregon
Motorcycle: 2013 F6B

Re: hesitation when trying to keep a constant speed

Postby CMReynolds1 » Thu May 14, 2015 2:28 pm

Virgil, that sounds like an awesome troubleshooting method. Nice info/experience sharing. Kudos!!
Ride Safe,
Taz


TF 116, RivRon 512, Can Tho, S. Vietnam, 8/66-/9/68, GM(G)2

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: hesitation when trying to keep a constant speed

Postby virgilmobile » Thu May 14, 2015 2:58 pm

Troubleshooting methods vary depending on the guy doing it.I prefer the cheap easy tests first of the most common problem areas before jumping down a rabbit hole after some obscure thing somebody mentioned on the internet.
It's just a systematic process of elimination.check,verify then move on.
There is obviously too much unburnt fuel as he shows by the condition of the spark plug(s) and popping (probably it igniting in the exhaust).
The steps list the most likley cause.
Poor compression,poor spark or just too much fuel being dumped.
This is a starting point.Easy and cheap.It can just as easily be a bad coil too if just a couple of plugs show fouled.
I don't know yet if its all 4 or just one.
It makes a difference on what to do in step 4.

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CMReynolds1
Posts: 647
Joined: Wed Sep 24, 2014 5:56 pm
Location: Oregon
Motorcycle: 2013 F6B

Re: hesitation when trying to keep a constant speed

Postby CMReynolds1 » Thu May 14, 2015 3:01 pm

I agree, after retiring from a Fire Dept. I went into tech repair. Troubleshooting is the key. Some are better than others. I was impressed how you laid it out. As you know, just about anyone can replace a part once they know which part. That is the trick of knowing which part!
Ride Safe,
Taz


TF 116, RivRon 512, Can Tho, S. Vietnam, 8/66-/9/68, GM(G)2

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: hesitation when trying to keep a constant speed

Postby virgilmobile » Thu May 14, 2015 3:15 pm

Sad but true.So many "repair" facilities (because of labor cost) lean more to requiring there techs just replace the most likley problem part(s) till its fixed.
My neibour had his car "fixed" this way.
About $1200,BCM,ECM and other parts replaced till they finally found a corroded fuel pump connector.
There was no actual testing done other than to confirm there was no fuel pressure.After that it was a parts changed job.

Acces-wild33
Posts: 7
Joined: Sun Aug 24, 2014 3:06 pm
Location: Racine wi
Motorcycle: 1980 honda goldwing 1100

Re: hesitation when trying to keep a constant speed

Postby Acces-wild33 » Fri May 15, 2015 10:36 am

Just wanted to say thank you for all the replies. I just did the compression test and cylinder # 2 had 90 psi, # 4 had 85 psi, # 1 had 115 psi, and # 3 had 120 psi. So when i started it up this morning the left side was smoking really bad the one with low compression.
Also i ran a volt test at 3000 rpms and the voltage on the battery was 14.9. it does have a brand new battery in it. So my next question is what is the next step i have to take. Thanks for the help so far and also looking forward to the replies.


Nate

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: hesitation when trying to keep a constant speed

Postby virgilmobile » Fri May 15, 2015 11:01 am

Forget about the volts for the moment,yes it will need to be fixed if you keep the bike.The first problem is the compression.Assuming it was measured wide open throttle on all 4 cylinders,there is your problem.Unequal compression.Or at least more that 5 psi difference.You'll never get it to idle and run well until you get them closer.90 psi is a borderline compression to fire a cylinder.120 is even on the low side.
First thing to try is check all the valve clearance.Adjust as necessary after you check the timing belts and cam marks.
If they all turn out OK the next step is to determine why the compression is low.Sometimes just lapping the valves will greatly improve it.A "head job".
You need to get the compression back up and equal for it to ignite the fuel correctly.Deal with the carb sync and electrical later.

Acces-wild33
Posts: 7
Joined: Sun Aug 24, 2014 3:06 pm
Location: Racine wi
Motorcycle: 1980 honda goldwing 1100

Re: hesitation when trying to keep a constant speed

Postby Acces-wild33 » Mon May 18, 2015 10:12 pm

Ok i finally got to work on my bike today and adjusted my valves. First thing i did was drain the oil and that smelt like straight up gas in my oil. I put the bike back together and did another compression test. 2 and 4 resulted in 90 psi and 1 and 3 was at 120 psi. So after the adjustment 1 and 2 moved up 5 psi. So thank you for the help so far. i was just wondering what the next step would be.


thanks

nate




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