I need help figuring out a bizarre problem!! - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 16 (permalink) Old 04-06-2017, 08:32 PM Thread Starter
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I need help figuring out a bizarre problem!!

Hi guys, new to the forum and boy do I need you experts on here to help me

I recently bought my wife a 2007 Shadow Spirit 750 and it was owned by a friend of ours. It only has 7900 miles on it and is really clean. My wife has only been putting around our massive subdivision on it until she gets comfortable enough to ride on the roads with me. She took a riding course and got her license but is slowly building confidence to out amongst the crazies, lol.

Recently she took off on it and rode around the subdivision for maybe 10 minutes or so and came back and told me the oil light had come on and she had noticed a "sound" that she didn't think the bike was making before. She asked me to ride it down the road and I did. I didn't go far, got it up to about 40 mph and the oil light never came on for me but I did notice the engine was making a ticking/tapping noise that I had not noticed before.

I brought it back into the garage and parked it. It was due for an oil change so I changed the oil and filter on it this past Saturday and the tapping seemed to be louder but maybe it's because it's in the garage and sounds louder. I noticed that it doesn't idle smooth either, I can see it shaking the tank and it seems cold natured. I rode it down my street, again got it up to about 40mph and it seems to run fine but when I brought it back in the garage, it's still making racket. If I start it cold, it runs and throttle response is poor and and it'll cut off.

I don't have the foggiest of ideas what it could be. My brother at first thought it might be fuel related, maybe ethanol rearing it's ugly head but I don't see how that would make a tapping noise. Well, upon further investigation, I recorded it running with my phone and it appears that the racket is coming from the front head. I had originally thought it was coming from the crankcase because I could feel it there but I can also feel it in the fins of the head. I then began to wonder if it was an exhaust leak. My brother, strangely enough, called me and said he (after seeing the video) thinks it's an exhaust leak at the header. I noticed that the left bolt seemed loose but upon tightening it it seemed to make zero difference.

As for the connection, I see a split piece of metal that seems to act as a press that's using the flange to press against and I guess it's purpose is to keep the exhaust gasket in place. Am I close at least? Does anyone think it's the exhaust? Or is there something more sinister at work here?

I can't get a good look at the rear exhaust to see how it compares to the front header connection but these are pics I took of the front.





I don't know anything about troubleshooting these things so any help is greatly appreciated!!!

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post #2 of 16 (permalink) Old 04-06-2017, 08:49 PM
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If it is an exhaust leak you will see some black soot forming around the flange area. The flange connection looks good to me but if you wrap a rag around the flange before it gets very hot and see if the sound is dampened at all, that can help diagnose the exhaust. And get a piece of garden hose or similar 2-3 feet long to use as a listening device up against your ear. Move it around the head area to pinpoint the sound.
The oil light concerns me a lot too. Was it very low on oil when you changed it?


Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #3 of 16 (permalink) Old 04-06-2017, 09:05 PM
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My bets are on "Valve Adjustment" is due...
It is easy enough to adjust the clearance after removing the "cylinder head cover" as HONDA calls it...
But my laptop diagnosis is sometimes inaccurate with noises...


Our Gurus will further advise...


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D
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post #4 of 16 (permalink) Old 04-06-2017, 09:14 PM
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My concern is that a valve adjust noise usually comes on gradually. If it is loud and runs a bit rough, that is more serious. I hope it is an adjustment.
If you pull the spark plugs look for any damage to the tips. Even a loose spark plug can do strange things like that.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #5 of 16 (permalink) Old 04-06-2017, 09:28 PM Thread Starter
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Swifty, it was not low on oil when I drained it and the oil wasn't shiny with metal either thank goodness. I will check the plug this weekend. I pray this will have a happy ending. Thanks for the help so far y'all!
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post #6 of 16 (permalink) Old 04-16-2017, 04:15 PM Thread Starter
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For those that care to hear the engine noise I speak of, here ya go!

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post #7 of 16 (permalink) Old 04-16-2017, 05:00 PM
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All your spark plugs tight? sorry, @swifty2014 already covered it. Shoulda read more posts!

2007 Shadow Spirit VT750C2, Ride bell by h13man, Ride cross by Capt D

Last edited by smilie; 04-16-2017 at 05:05 PM.
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post #8 of 16 (permalink) Old 04-16-2017, 07:17 PM Thread Starter
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I actually replaced all 4 of the plugs yesterday just to eliminate that. I also took the valve covers off and adjusted all of the valves to the recommended clearances. Still making the noise!
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post #9 of 16 (permalink) Old 04-16-2017, 07:52 PM
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Exhaust leak, look at the second picture and you can see the right exhaust flange is not recessed in the exhaust flange ring like the one on the left. Also there is suppose to be a copper exhaust gasket that sets in the head.
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post #10 of 16 (permalink) Old 04-16-2017, 09:04 PM
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Is it me or does this look cracked?

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