Question about Honda VT 500 C Shadow Motorcycles

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I am having problem with my shadow only running at both cylinders during idle the minute you give it gas the front cylinder cuts out wew checked the compression and have 175psi in the front cylinder and 170psi in the rear also we have spark all the way around and am getting plenty of fuel and air. we took the carbs off and they were clean only possible problem with them were they were slightly out of sync could this be the problem or is there a timing issue. Thanks

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This is a timing issue. if they was out of sync then you would feel a more powerful hit on one and a drag on the other. if you do not get the hard slow hard slow then sync is not it. go and have your timing looked at i am willing to bet you are a couple of degrees (sorry for this, its the term not a hit on you) retarded.

Posted on Feb 10, 2010

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1998 Honda VT 600 C Shadow one cylinder stops firing occasionally


Hi, Charsman_99 and the usual suspects are:
1. Severely discharged or a damaged battery must 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. Faulty 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. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system and or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty 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. Fuel tank empty
11. Fuel tank contaminated with ethanol sludge.
12. Water or dirt in the fuel system, or clogged filter.
13. Restricted, blocked or kinked fuel line.
14. Faulty fuel pump.
15. Faulty pressure regulator.
16. Faulty or clogged fuel injectors.
17. Lean angle switch is faulty or needs adjustment.
For more information about your issue and valuable "FREE" downloads that you need please click on the blue links below. Good luck and have a wonderful day.
One cylinder stops firing while riding
1983 Honda Shadow running on one cylinder
Honda VT600C Shadow VLX Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda VT600C Owner Manual

Apr 16, 2012 | 1998 Honda VT 600 C Shadow

3 Answers

Front cylinder misfire at idle,then raise rpm's to 2000 area an it comes in an out popping thru exhaust.front cylinder cold to the touch when rear is hot, till it runs a couple of min. New plugs, good...


I am not sure if the bike is a 650 or 1100 but in either case it sounds like a fuel issue or and air leak. When the carbs were off for re-jetting did they get cleaned? The slow circuit controls to about 2000 rpm and it sounds similar to your problem.

The first thing to look at is the carb synchronization. If the front cylinder is lagging, it can give the same symptoms. I do not think that the exhaust is a factor because the front is cold when running.

Spray some WD 40 at all the intake manifold area when the bike is running and see if the idle changes. the idle will change and push some smoke out of the exhast if the intake is leaking.

If both of these check good I would pull the carbs back off and clean the slow circuits out completely. This is delicate work and shoud be done by and experienced tech.

If I can help some more just send message.

I hope that his helps. Steve

Jan 18, 2011 | 2004 Yamaha V Star Classic

1 Answer

Vehicle takes 5 minutes to idle by itself. Why?


An inadequate functioning egr system.The exhaust gas recirculation valve uses spent exhaust gases to line the cylinder walls with burnt gases.The purpose of this is to keep the cylinder temperature lower to reduce emissions of oxides of nitrogen.

Jun 01, 2010 | 1990 Pontiac Trans Sport

3 Answers

96 Shadow. 1 cyl cuts out after heating up. Then engine runs on 1 cylinder.


After heating up.. I would check for spark on that cylinder when it is warm... could be a coil going bad.
Just a thought...

Feb 28, 2010 | 1996 Honda VT 1100 C Shadow Spirit

1 Answer

1984vt 500cc honda shadow back fires on front cylinder engine runs and idles good


Back fire to tht cylinder could be due to lack of gas (fuel) in the float chamber..try to check tht carburator and adjust the float.
Hope this helps!

Oct 23, 2009 | 1984 Honda VT 500 C Shadow

1 Answer

'07 Triumph Bonneville idles but wont accelerate


What happens when you try to accelerate?

Does the exhaust smell 'weird' when it's idling?

The most likely problem, especially with the bike sitting up during summer, would be gas has gone stale. If the bike sits long enough, the gas will actually turn into a varnish.

Drain the tank, refill with fresh gas, and let it run a while.
Basically, you have to run out whatever gas is between the tank and the cylinders, so the fresh gas can get to the cylinders.

I'd put a box fan blowing on the front of the bike to help keep the ehat down. Blip the throttle after a few inutes. Depending onhow much old gas is 'stored' in the fuel lines and such, it may take 10 or 20 minutes to burn out the old gas. Keep blipping every few minutes, and let it cool down after 20 minutes. Some bikes have short fuel path and clear in 2 minutes at idle, I've seen custom setups that took over an hour.

Sep 27, 2009 | 2007 Triumph Bonneville T100

1 Answer

Motorcycle dies while riding,like gas is cut off


Check fuel pump. You might have a bad diaphragm.

Jun 02, 2009 | 2002 Honda VT 600 CD Shadow

1 Answer

Just purchasted my Shadow and it seems to be only firing on one cylinder at idle. the bike was not run for 5 or 6 months. It will backfire when rev'd and the other cylinder will kick in spiraticly. Any...


Gas could be old, but it sounds more like you are losing spark to that cylinder at low rpm. Try a new spark plug, they're cheap. If that doesn't help, you could have a particle clogging the pilot jet of that carburetor. The pilot jet only works until you throttle it above idle. If it's clogged with a little junk, it will make bike idle terribly. Try spraying some carb cleaner through it (the one not running) with the engine on, and see if it likes the addition of fuel to that one cylinder. THis will tell you if you're lean on that jug. Good luck. Let me know. TT

Apr 21, 2009 | 2002 Honda VT 750 DC Shadow Spirit

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