Question about 1986 Honda VT 500 C Shadow

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1986 VT 500 C SHADOW fuel line routing

1986 VT 500 C SHADOW FUEL TANK AND PETCOCK LINES? I have 3 line openings (*******?) on the petcock, and one line opening (nipple) underneath, on the bottom of the tank at the front of the bike. Just need help with locations of. ON PETCOCK 1) The Larger nipple is for the fuel line. 2) Smaller one, on side of petcock, pointing down, and located in the front of bike side o the petcock, the line comes off the cylinder and plugs to the nipple which is the vacuum line. 3)The third Petcock nipple (also small nipple) on the back pointing towards bike frame, is where I need help because there are no lines near it to attach it to so my question is where should I run this small line when I get a new one? What does it attach to if anything? East coast bike and no charcoal canister/emissions. 4) Also, the nipple at the front of the tank underneath had a short line that looked like it was broken off, but believe this is just the tank vent line that can be run down through the frame or someplace close? Thanks in advance for your help...

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Hi, Spinnuh for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1986 VT 500 SHADOW fuel line routing Google Search
Air Cut Off Valve Fuel and Vent Hose Connections for 1985 Honda Shadow...
http://www.cycleterminal.com/Service-Manuals/Honda-VT500C-Shadow-Service-Manual-English.pdf
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-vt-owners-manuals

Posted on Jul 14, 2017

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Posted on Jan 02, 2017

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SOURCE: fuel petcock

The petcock is what the fuel flows through when it comes out of the gas tank. It probably includes: * A switch with positions for On, Off and Reserve. * A fuel line going to the carburetors. * A vacuum hose attachment which attaches to a carburetor which tugs on a rubber diaphram to let gas flow through. * An overflow/drip valve from the vacuum area. It's located right under the tank on the rear/left side.

Posted on Nov 10, 2008

wd4ity
  • 4565 Answers

SOURCE: my 1998 Dyna has a small leak or drip coming from petcock

Sounds like you have a hole in the vacuum diaphragm that opens and closes the petcock. This is one of the problems with the vacuum operated device. The other problem is that sometimes they don't open and you're left stranded with a full tank of gas and not a drop in the carburetor. I changed to a manual operated petcock. Personally, I'd rather have a Pingle petcock than another vacuum operated Harley petcock. If you do change to a manual operated petcock, don't forget to plug the small vacuum hose.

If you want to keep your vacuum operated device, I think you can buy a replacement diaphragm. You will have to drain the tank and remove the petcock. There are four small screws on the backside. Remove the screws and the backplate will come off. The diaphragm and a sping is all that is in that section of the petcock.

Posted on Apr 01, 2010

  • 1857 Answers

SOURCE: Not sure the vacuum lines

bikebandit.com may have schematics, The sell parts and usually have a layout of the systems

Posted on Aug 10, 2010

  • 33 Answers

SOURCE: CAN I USE A DIFFERENT GAS PETCOCK WITHOUT THE VAC

if you dont use the original style you will flood the carbs every time. the vac style on this bike has metered flow for these carbs

Posted on Sep 06, 2010

Testimonial: "Thanks.Was very helpful."

  • 1 Answer

SOURCE: 82 gs 550 two nipples on petcock and one nipple on

is there one bigger then the other on the nipples. If so the one bigger is for the carb fuel and the little one should run down the left carb, betewwn the front of the carb and the carb mount.

Posted on Nov 04, 2010

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1984 Honda ascot vt500 will not stay running


Hi, Jerry and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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Aug 24, 2013 | 1983 Honda vt 500 ft ascot

1 Answer

1986 Honda VT 500 C Shadow will not start


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
14. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch, kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Jul 16, 2013 | 1986 Honda VT 500 C Shadow

1 Answer

1986 Honda VT 500 C Shadow will not idle


Hi, Dmikecarley and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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http://www.cycleterminal.com/Service-Manuals/Honda-VT500C-Shadow-Service-Manual-English.pdf
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-vt-owners-manuals

May 07, 2012 | 1986 Honda VT 500 C Shadow

1 Answer

1986 Honda VT 500 C quit running when hot


Hi, Jessemowry22 and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Faulty or corroded kill switch.
11. Accelerator pump damaged or not working.
12. Water or dirt in the fuel system, carburetor or filter.
13. Restricted, blocked or kinked fuel line.
14. Fuel tank empty.
15. The gas cap is not venting properly or fuel tank venting system blocked, loosen gas cap and go for a test ride.
16. A failed fuel pump, pressure regulator and or fuel injectors.
17. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
18. Needle and seat stuck closed in the float bowl.
19. Petcock clogged or damaged.
20. Lean angle switch is faulty or needs adjustment.
21. Catastrophic engine failure, perform a compression test.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Oct 17, 2011 | 1986 Honda VT 500 C

2 Answers

Does the Honda 500 shadow have a fuel pump


No this model did not come with a fuel pump. Actually the VT 700 Series was the only Honda from 1986 that contained a fuel pump.

Aug 27, 2011 | 1986 Honda VT 500 C Shadow

1 Answer

1985 Honda VT 500 C Shadow won't start


Hi, Hoskins22 and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
14. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch lever, or kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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http://www.cycleterminal.com/Service-Manuals/Honda-VT500C-Shadow-Service-Manual-English.pdf
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-vt-owners-manuals

Oct 07, 2010 | 1985 Honda VT 500 C Shadow

1 Answer

1987 Honda VT 500 C Shadow will not start


Hi, Sandromr_23 and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
17. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
18. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
19. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
20. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
21. Faulty neutral, clutch, kickstand safety switch.
22. Faulty fuel pump or fuse or relay.
23. Faulty or corroded run/stop switch.
24. Tilt sensor needs a reset.
25. Security system not disarming alarm needs a reset.
26. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Problem Solved
1983 1986 Shadow 500 VT500C Service Repair Manual English German French... $15
https://www.partsfish.com/page/oem-parts-for-honda
https://trawweasucne.files.wordpress.com/2015/08/1985-honda-shadow-vt500-owners-manual.pdf

Sep 06, 2010 | 1987 Honda VT 500 C Shadow

1 Answer

I have a '94 honda shadow 600 and would like to know how to remove the fuel tank.


Remove the seat and then remove the single bolt that holds the rear of the gas tank down. From that point, slide the tank back and off of the two rubber bushings that the front of the tank is resting on. Disconnect the fuel and vacuum lines from the petcock - then lift the tank from the bike.

Nov 25, 2009 | 1994 Honda VT 600 C Shadow

1 Answer

Need vacumn line routing for the petcock


The other two carburators will connect to each other, then the closest to the petcock attaches to the petcock vacuum. This is the smaller of the two lines off of the carburator. The larger one is where fuel runs into carb, the other operates the vacuum pumps in the carbs to pull fuel. I hope this helps, I repaired this myself, therefore I have no schematic to provide to you. I hope this is helpful

Jul 11, 2009 | 1986 Honda VT 500 C Shadow

1 Answer

Leaking Fuel tap (petcock)


This sounds like a vacuum lock pet ****. 3 position? run, prime,and reserve? If you have it on pri, You will fuel running or not. If set on run, then you will only pass fuel when engine is running, and of course res. when tank is used up. Is this leak at the valve? or from the tank or internally flowing? Tis should also be a gravity feed fuel system, please correct me if I'm wrong. good luck. Long fuel lines are not prefered on gravity feed systems.

May 20, 2009 | 1986 Honda VT 500 C Shadow

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