Question about Honda VTX 1800 Motorcycles

2 Answers

2000 vtx 1800r running rich at idle...spark plugs black with soot.

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 491 Answers

Check out this forum for some good tech info on the VTX

If you have been running high octane gas, it will foul the plugs on a VTX. They run cleaner on low octane fuel.

also the choke has a tendancy on some of these bikes to move out, so make sure it seats all the way down.

Posted on Jan 06, 2011

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 53 Answers

Have you changed the oil lately? If there is to much oil in the motor the bike will push oil up into the airbox and foul the air filter out. This will cause the bike to run rich. check the oil level and then drain any excess out to the proper level. You will need to clean or replace the air filter in order to make the bike run well.

Posted on Jan 02, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

00 honda passport intermittent rough idle

called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

Jun 07, 2014 | Cars & Trucks

1 Answer

Engine is running rich, spark plug is black, spark arrestor is black, after only 2 tanks, do they have smaller jets for this carb

you need to alter the fuel mix. there is a fuel mix screw on the side of the carb. screw in for less fuel. then check on ldel loads on spark plug... then test on full load then check spark plug again. dont mix up the idle screw with the mix screw. should have a white film on idle speed and a slight red colour or full load. run for 10min at a time then check.

Jan 08, 2014 | Yamaha Ef2600 Generator/inverter...

1 Answer

What size is the socket to remove a spark plug on na Honda 1800R 2004 model

Hi Anonymous, I believe it is 5/8" Good luck and have a nice day.

Dec 03, 2013 | 2004 Honda VTX 1800

1 Answer

Audi a3 1.8 non turbo 1999. car idles very ruff, i changed the spark plugs with the last service last week. could this be a faulty spark plug? it has a very rich fuel smell, when idling

A rough idle can be due to poor timing./fuel tuning.So an examination of the spark plug will give the indication of the firing of all the cylinders with which we can confirm . If the spark plugs are burnt then the fuel mixture is good but if there is a black soot or soggy smear then the fuel settings are high or the spark intensity is low.
So you need to check on the fuel pressure-- have the pump calibrated .
Check the spark intensity , it must be good or the HT coils or the electronic ignition is faulty as the trigger can be low. Check also the timing. it is good to have the job done at the service outlet.

Sep 01, 2011 | 2005 Audi A4

1 Answer

Backfiring on deceleration from exhaust pipes

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

Apr 03, 2010 | 2005 Honda VTX 1300 R

1 Answer

My spark plugs seem to soot up, is the mixture wrong. will the jets need setting. i have a heritage classic year 2000

Yeah the mixture is too rich.Didn't say but are both plugs sooty?Anyway,if jets have been ok then all they could be is dirty and you'd have other problems.Take air cleaner off and make sure choke plate is fully open with choke lever off.Adjust all the fuel/air screws for proper idle and throttle response.Check voltage of spark from coil.Then try differant heat ranges in plugs to get hotter fire.Just a thought.Are you sure it's soot and not oil residue?Oh yeah,when you have new plugs in before you fire it up wipe out the ends of the pipes,real clean.Then after it runs awhile look at the pipes.Sooty? gray?black?Gray or lite tan is best.Try heat ranges til you're happy.

Mar 20, 2010 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

Vehicle smells like gas both inside and out of car after engine is off. Check Engine light is on but no noted deficiences noticed, all fluid levels good. what could be the problem?

If your check engine light is on when the car is running, then that means there is probably a trouble code stored in your vehicles computer. With a code reader, you can find out what the code is. That will direct you to the problem. You can post your code here and we will tell you what it means.
Regarding the 'gas' smell, first check to see if your car is running 'rich'. You can rub your finger inside the tailpipe and see if there is a lot of black soot there, which would indicate its running too rich (too high of a fuel to air mixture). If this is inconclusive to you, remove the spark plugs and check if they are with black soot on them where the pin is. This will tell you how the engine is running in terms of fuel mixture. If they are black, then you have found the problem (fuel injection problem or Oxygen sensor, most likely). The trouble code might also point to this. Other than that, sometimes an exhaust leak can cause fumes to leak up into the car when running. My car had the gas smell problem and it was both a hole in the exhaust under the car and an overly rich fuel mixture. I had black soot inside the tailpipe and black sooty spark plugs and the final problem ended up being a bad oxygen sensor (located on the intake manifold), that was sending an improper signal to the vehicle's computer, thus the reason for the problem.

Sep 24, 2009 | 1996 Dodge Intrepid

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

414 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4525 Answers


Level 3 Expert

76164 Answers


Level 3 Expert

4340 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides