09 Honda Shadow Aero 750
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Discussion Starter · #1 ·
Hey Everyone
I have an 09 Honda Shadow Aero 750. It has around 11k miles and is carbed.
When I bought the bike, it had an aftermarket air filter. The bike came with an instruction sheet about cleaning the filter and stuff from the air filter manufacturer. Anyways, it was looking really dirty so I decided to clean it today per the instructions. I let it dry out for almost 10 hours and verified it was dry before putting it back on.
Before I took the filter off, the bike ran perfect. Started on first turn over and only needed choked for a few seconds when cold. Now it wont start at all after putting it back on.
A few things I have done: verified spark, verified fuel, verified battery voltage, tried with the filter on and off to make sure something didn't happen to the filter.
The bike is turning over but just wont start. I tried with the choke on, and nothing. If I turn the choke off and turn the throttle I get one pop out of the exhaust almost like a backfire but nothing else besides the engine turning over. I made sure it wasn't flooded as well.
This is pretty embarrassing because I went to automotive trade school, got GM ASEP certified and worked in a car dealership as a mechanic for 4 years so I know what the engine needs to run, but even with air, fuel and spark it wont start. I will say I have no knowledge of how carbed engines work outside of the basic theory we were taught in my engine classes. I probably should have listened to my one instructors guidance of if it ain't broke don't fix it. I know it's got to be something stupid so I am looking for outside opinions to point out stuff I may have missed. I appreciate any help I get with this.
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Hmm...have you verified fuel reaching the cylinder, or just the carb? Also, could anything have gotten in the intake while the filter was off? Certain bugs LOVE the smell of fuel, I'm picturing a yellow jacket impaled by the needle valve...
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It would be a strange coincidence that something unrelated would go wrong when the air filter was removed. I would double check for something being disconnected in the process.
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Discussion Starter · #4 ·
Thanks for the info. I am getting fuel on the plugs so I would assume it's getting enough fuel but I could be wrong.
One thing i wasn't sure of is what this black thing is in the intake in the attached picture and if it's supposed to be up or down. I know I can move it by hand but it's in the closed/down position. I will check for bugs and other debris when I get home.
I would agree I think it's something I either accidentally hit when I was removing the intake or I didn't put something back on that was supposed to be put back. I don't have any extra parts laying around and the bike successfully handled an hour and a half drive the day before so it was running fine before hand.
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That black thing is your carb slide. It's supposed to be down until you twist the throttle. If you have CV carbs it won't move with the engine off, it moves from vacuum created by the intake, but a regular ol' carb slide is attached direct to the cable.
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Discussion Starter · #6 ·
After working on the bike for a few hours I still haven't fixed it. I charged the battery to be safe, replaced all of the plugs, drained the fuel and put new fuel in. Nothing different. I noticed there is what looks like gas seepage between the carb and the intake manifold(?) There's a rubber boot on the back side of the carb that connects it to the motor and that's where I see the fuel. Could it be that there isn't enough fuel getting to the motor? The plugs smelled like gas when I checked them and they were somewhat wet (not soaked). I'm going to take the tank and carb off tomorrow to investigate further.
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Oooh yeah, post-carb intake leak=bad news. Definitely check those boots. It would have to be pretty severe to keep it from running entirely, I would think, but even a tiny leak can ruin your day if you run it like that long enough. Incidentally, how did the plugs look? Nice and tan?
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Taking that further, is it possible that you knocked the carb(s) out of the boot, so they aren't really connected to the intake, just sitting on it? That would do it!
Did you disconnect the spark plug wires and perhaps mix them up?
This has to be something simple, your going to laugh when you find it, please share what you find!
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Discussion Starter · #10 · (Edited)
Well it was that boot between the carb and intake manifold. When I took the tank off I could see the boot was completely off the carb side. After putting the boot back on the carb the bike started right up and kept running. No more gas leaking either.
Thanks for the help. I kinda figured thats what it was when I saw the gas leaking from it last night. You guys have been a great help with this.
At least now the bike got the tune up it needed and I even fixed a few unrelated minor annoyances at the same time since the bike was apart.
I've attached a picture of the boot I'm talking about. It's kind of hard to see it but it might help someone with the same problem in the future.
Edit:
And yes, the carb most likely came out when I took the air filter off to clean it. I will say if it was that loose I am glad it happened then instead of when I was out riding. I knew I had caused the issue when I was working on it initially, I just didn't know what the issue was until I found that boot leaking fuel.
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Source: https://www.motorcycleforum.com/threads/09-honda-shadow-wont-start.195138/
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