Question about 1985 Honda VT 500 C Shadow
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.
1985 VT500 Won Start
What to do When Your Motorcycle Won Start
Posted on Jul 15, 2017
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Posted on Jan 02, 2017
Your valve clearances should be:
Intake .08-.12 mm (.003-.005 in)
Exhaust .12-.16 mm (.005-.006 in)
I usually start all gaps in the middle of given specs, then fine tune from there.
Hope this helps
Posted on Mar 15, 2009
start by synchronizing your throttle plates. Honda calls the next step the "idle drop procedure". u need to know if you have fuel adj. screws or air adj. screws. fuel screws will be on engine side of carb slide, air screws will be on airbox side of carb slide. start leaning out mixture, (turn in fuel screw, turn out air screw. idle will increase so keep adjusting idle back to spec.after each turn if needed. Adjust about 1/4 to 1/2 turn at a time on each carb until there is no change in idle, then richen up mixture by one half turn. If u sync throttle plates first then follow this procedure, there should be no hesitation when you "blip" the throttle, and after revving it should return to idle smooth,
Posted on Apr 09, 2010
The fuel filter is in the tank on the petcock and is self cleaning. I suspect you have bad spark plug caps on your bike the cap is part of the wire. If you remove the wire and take a reading with an ohm meter, the cap should read 5000 ohms . Anything above or below and you should replace the cap. This is probably causing the slight miss.
Posted on May 06, 2010
Take off the left side cover (press fit) . You'll need a screwdriver phillips or flat head and a ten millimeter socket. Remove the bolt on the right side of the bracket to the frame and swing it out of the way. Unbolt the battery cables, unhook the overflow tube, and lift the battery out of the left side of the bike.
Posted on May 06, 2010
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