Question about Honda VTX 1300 Retro Motorcycles

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I have a VTX 1300 that is backfiring, coughing and sputtering. I had the floats adjusted end of last season, didn't help. I've tried octane booster , didn't help. I've heard this model year, '06, is difficult to get carbs adjusted correctly. If I go over a bump, it seems to cough too - any ideas?

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You may have an air leak (extra air getting in) between the carbs & the engine. Inlet manifold rubbers do crack on Hondas but Yamahas are the worst.
Check for cracks, check the o rings (each end of inlet manifold) & check for leaks from air-box to carbs
Carbs need to be balanced (synchronised) to let the engine run smoothly but will not produce those symptoms if left unbalanced.
You should also check the HT leads & spark plug caps for shorting, run the bike in the dark & look for sparks going to earth (sometimes you can only hear a ticking as the spark jumps across). Make sure the leads are not touching anything during this procedure

Ride safe
Please mark this as very helpful (if it has been!!)

Posted on Apr 27, 2010


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06 Honda 1300 VTX C started dying on warm up recently was told about petcock take big line off turn it over gas come out but still it won't start is this a petcock problem help!!!!

Hi, Ryan the following applies to carbureted also fuel injected models and the usual suspects are:

1. Severely discharged or a damaged battery, 9 volts or lower.

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, 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. Air/fuel mixture screw improperly adjusted.

10. Water or dirt in the fuel system, carburetor or filter.

11. Restricted, blocked or kinked fuel line.

12. Fuel tank empty.

13. Gas cap is not venting properly or fuel tank venting system blocked.

14. A failed fuel pump, pressure regulator and or fuel injectors.

15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.

16. Needle and seat stuck closed in the float bowl.

For more information about your issue and valuable "FREE" downloads that you need please visit the websites below. Good luck and have a nice day.

2006 CBR 600 RR sputters out after it heats up Honda Motorcycles...

Mar 11, 2016 | Honda Motorcycles

1 Answer

2003 Honda VTX 1300 Retro popping from the exhaust just off idle

Hi, Anonymous if your carburetor or exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp build up of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
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.
Exhaust Popping Idle
Honda VTX1300S Service Manual
Honda VTX1300C VTX 2004 Owner Manual

Apr 10, 2013 | 2003 Honda VTX 1300 Retro

1 Answer

I have a '05 VTX 1300R. The thing sputters and coughs so I put an expensive grade additive to the fuel. Has been working well enough till I get closer to the bottom of the tank. Recently the weath

Hi most likely the carb need cleaning or you have some water in the bottom of the float bowl. you can try this, there is a float bowl drain screw on the float bowl so if there is water it will drain out. this is just a first easy step if it works your good to go if not time to pull the carb and do a complete cleaning (note most do it yourself home mechanics will clean carbs and over look the most important part, you need to pay close attention to the low speed jet make sure it is not blocked and if it is unblock it i use copper wire strand if it is fully blocked the blow it out and spray through with carb cleaner.
I use Brand name carb cleaner ( Sea-Foam ) This is an excellent product for removing gummed and hardened fuel deposits it comes in can liquid and as a spray.

Oct 30, 2012 | 2005 Honda VTX 1300 R

1 Answer

Honda vtx 1300 backfires when letting off throttle,never did it before until it was laid down on loose gravel

replace the air filter, and when the covers off tap the bottom of the carbs with a hammer and piece of wood or plastic.

Sep 07, 2012 | 2004 Honda VTX 1300

1 Answer

My 05 VTX 1300R just sat and was only ran 1 time in almost 2 years w/ Stabil in the gas.It ran fine last time I rode it, fall of 2009. Statred today and acts like it is starving for fuel, will not idle off...

Recheck fuel flow wth float bowl removed allow floats to hang free. And fuel will flow out, remove float needle check for sticking in seating, remove secondary jet and clean with fine wire to remove fuel contamination,also main jet, if all else fails find a used carburettor to replace old one

May 01, 2011 | 2005 Honda VTX 1300 R

1 Answer

2004 honda vtx 1300 c stalls out after down

ever drain your carbs ? should be done seasonally . fuel filter problem, sounds like it is running out of gas.

Oct 10, 2009 | 2004 Honda VTX 1300 Retro

1 Answer

My vtx backfires wont run over 40 km/hr ..changed air filter

Watch if is not limited or adjust the air in carburator.

Aug 06, 2009 | 2005 Honda VTX 1300 R

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