Dropped bike and now it runs poorly - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 19 (permalink) Old 09-12-2019, 06:12 AM Thread Starter
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Location: Valparaiso, IN, USA
Year: 1990
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At least it wasn't moving at the time, even after two years of having it I still forget to plan for the weight of it. I need to keep remembering keep the front wheel straight when stopping and now remember to check for that side stand light! My Shadow 600 was so different, almost like getting on a kids bicycle.

1990 GoldWing 1500
2002 Shadow VLX Deluxe
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post #12 of 19 (permalink) Old 09-12-2019, 10:22 AM
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Of all my bikes, the 1500 seemed to be the one that most often decided to take a nap.
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post #13 of 19 (permalink) Old 09-13-2019, 06:18 AM Thread Starter
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OK, I'm feeling better with comments like that .....


Started taking it apart, nothing found yet although I now have two screws with stripped heads that hold the air filter housing to the carbs, that's when I stopped for the night!

1990 GoldWing 1500
2002 Shadow VLX Deluxe
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post #14 of 19 (permalink) Old 09-14-2019, 03:54 PM Thread Starter
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Update:
I pulled the carbs off today and have not found any possible reason for the low idle. The rattling noise only happens around 500 rpm, at normal idle speed it's fine. The orange stripped hose that goes between the intakes under the carb is fine, as are the rest of the vacuum hoses at least as far as I can tell. To check the floats I blew into each fuel inlet and rotated the carb until the needle closed, they don't appear to be stuck. I have spark at all 6 plugs, however the left side plugs are a little black and sooty whereas the right side plugs are a more normal tan/whitish. I'm a little stumped, I have spark, I have fuel and I have compression - except it seems that something is not quite right. Any more thoughts while it's all apart?


Anyone know where the bank angle sensor is? Can't seem to find it in my manual.

1990 GoldWing 1500
2002 Shadow VLX Deluxe
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post #15 of 19 (permalink) Old 09-14-2019, 05:58 PM
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It is not unusual after years of use that the carb insolators shrink up and become loose. A dropped bike could cause the carbs to move and suck air. That would lean out fuel mixture. A small leak will increase idle speed. A bigger leak will cause the idle to slow down.
If that is the case the plugs will turn black from misfires so don't let that fool you. Lean mixtures can have black plugs.
Beware, there are stops on the clamps so they can't be overtightened at the factory. After you put the carbs back on try to rock them back and forth. You should not be able to pull them loose from the manifolds very easy.
One of the best ways to find a vacuum leak is to use your propane torch or gas from your gas grill. Make sure you use the regulator on the gas grill tank.
One other thought. Try turning the idle up to 750 with the adjuster knob under the fuel filler door.

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Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #16 of 19 (permalink) Old 09-14-2019, 09:05 PM
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Quote:
Originally Posted by fibersport View Post
Update:
I pulled the carbs off today and have not found any possible reason for the low idle. The rattling noise only happens around 500 rpm, at normal idle speed it's fine. The orange stripped hose that goes between the intakes under the carb is fine, as are the rest of the vacuum hoses at least as far as I can tell. To check the floats I blew into each fuel inlet and rotated the carb until the needle closed, they don't appear to be stuck. I have spark at all 6 plugs, however the left side plugs are a little black and sooty whereas the right side plugs are a more normal tan/whitish. I'm a little stumped, I have spark, I have fuel and I have compression - except it seems that something is not quite right. Any more thoughts while it's all apart?
Anyone know where the bank angle sensor is? Can't seem to find it in my manual.

The key to a successful repair is to diagnose the problem to a component. No mechanic dives into a problem hoping they will see a fault, it is done through DIAGNOSIS. You were given a routine to follow earlier. Like minded problems on an internet forum is a shot in the dark and a guessing game.

Now, your darker colored plugs could mean proper combustion with lighter lean combustion or darker colored rich combustion and lighter colored correct combustion. This would have been confirmed one way or the other through proper DIAGNOSIS before ripping things apart, now you are pucked and back to square one. I pretty much gave up long ago trying to convince folks to DIAGNOSE the problem first before the masses (more often wrong) easy replacement part fix.
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J.D.

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post #17 of 19 (permalink) Old 09-14-2019, 10:50 PM Thread Starter
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Redwing52 - I once had a 73 Beetle, also used a propane torch to check for leaks but since the drop in rpm was on the high side, I thought for sure it was a problem with the orange marked hose between the intakes. My insulators were nice and tight, I had also thought maybe that's where I would find the problem but no such luck.



DriverRider - You did privide a nice tutorial on diagnosing but you also suggested "After a visual inspection of components strip it down a bit and diagnose the problem." Part of my visual inspection was to verify that the 30 year old vacuum lines had not developed any holes or cracks, really can't do that unless you pull off the carb, and besides I had a few hours to myself and my bike. Now that I know the vacuum lines are not the cause of the problem, I can continue to inspect and diagnose. I do appreciate your assistance on this and your diagnostic method is indeed a good methodical way to approach an unknown problem.

1990 GoldWing 1500
2002 Shadow VLX Deluxe
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post #18 of 19 (permalink) Old 09-15-2019, 12:14 AM
It aint rocket science
 
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Originally Posted by fibersport View Post
DriverRider - You did privide a nice tutorial on diagnosing but you also suggested "After a visual inspection of components strip it down a bit and diagnose the problem." Part of my visual inspection was to verify that the 30 year old vacuum lines had not developed any holes or cracks, really can't do that unless you pull off the carb, and besides I had a few hours to myself and my bike. Now that I know the vacuum lines are not the cause of the problem, I can continue to inspect and diagnose. I do appreciate your assistance on this and your diagnostic method is indeed a good methodical way to approach an unknown problem.
Your thirty year old hoses would not have suddenly out of the blue developed holes after a tip over.You read too much of the false internet, not everything written on the net is factual.
Your problem would be diagnosed to a component in my shop in less than 30 minutes after plastic removal.

J.D.

There is NO substitute for experience
I'll be around when I come around and not before
Internet myth buster

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Yamaha 360
Yamaha 650
WS Grand Chapter CT
If local and need help with a 1500, Valkyrie or ST repair please PM
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post #19 of 19 (permalink) Old 09-15-2019, 08:14 PM Thread Starter
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Year: 1990
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Turns out it was fouled plugs. When I started thinking about it, the fact that my bike will sometimes put out a puff of smoke if left on the side stand for a few days got me thinking. When it fell over, it went past the roll bars and really laid down. That allowed oil to flow into the left valve cover, when I righted the bike and went to start it, some of that oil leaked past the valve guides an went into the left cylinders which then allowed the left plugs to get fouled with oil. New plugs and she's purring like a kitten.

Thanks to all who replied, having a bunch of ideas does help.
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1990 GoldWing 1500
2002 Shadow VLX Deluxe
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