Question about Honda VTX 1800 Motorcycles

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I have a 2003 vtx 1800s with hyper charger and custom exhaust dont know what kind bought it this way.The bike keeps fowling sparkplugs every 4 to6 hundred miles what is wrong with bike

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You have a fuel injected motorcycle. It is made to work with a stock intake and exhaust. When you alter the stock system it does not know how to compensate for some of the conditions that will come up. Most people buy a Power Commander and program it to compensate for the changes that the stock system will not compensate for. If you already have a Power Commander then you should hook it back up the computer and reprogram it or look on line to see if there is a better map available for the changes on your bike. If you do not have a Commander get, get one. If you already have one, get your program disc and cables and re-map it or take your cycle to someone who can.

Posted on Sep 10, 2010

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SOUNDS LIKE IT IS TO RICH OR THE VALVES NEED CHECKED ALSO HAVE YOU INSTALLED PIPES OR TAKIN OUT BAFFLES,MAKES A DIFFERENCE,JETTING WISE ALSO STOCK AIRFILTERS ARE ****,GET ATLEST A UNI FILTER COST MAYBE 20 TO 30 OR K N.COST 50 TO 60 IF YOU GOT THE MONEY GET THE ARLEN NESS PACKAGE OR HYPER CHARGER,THOSE BIKES DONT BREATH WELLALSO CHECK YOUR TAIL PIPES ARE THEY WET OR ALOT OF RESIDUE.IF SO THAT IS SIGNS OF BOTH TO RICH OR CHOKING OR BOTH
ALSO THIS NEW GAS IS ****,WHAT I WOULD DO CHEAPEST,IS INSTALL NEW AIRFILTER,NEW PLUGS AND AT THE BOTTOM OF YOUR CARBS UNLESS FUEL INJ IS DRAIN SCREWS UNSCREW THEM UNTILL GAS DRAINS OUT AND RETIGHTEN IN CASE YOU BIKE HAS ANY WATER LAYING IN THE BOWLS,MAKE SURE YOU ARE IN A WELL VENTALATED AREA.,YOU MAY ALSO TRY TURNING YOUR FUEL METERING SCREWS A HALF A TURN AT A TIME TILL YOU GET YOUR LIKING,BUT YOU NEED TO TURN ,RIDE THEN READJUST

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Only getting 20 to 26 miles per gallon. Usually gets 29 to 31. Replaced fuel pressure regulator, spark plug wires. Useing power commander and bike runs good but low miles per gallon?


You don't say how many miles you have on the bike or if you replaced fuel filter at the same time or sparkplugs too..How is the aircleaner ? Do you use choke a lot.VTX's seem to be touchy if the choke is over used.How about the aftermarket power commander.Are you running factory pipes.Let that baby breath Remember the engine is a pump The idea is to get the right ratio of air and fuel in and allow enough discharge orexhaust toget out..Hope this is a little help

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sound like you just running low on fuel you probably dont have a problem at all don't let you fuel level run so low if it does that turn your fuel petcock to reserve and head for the nearest gas station.

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I recently bought a 2003 Honda Vtx 1800s. when I go in to a left turn the bike does not fill like it wants to take the turn. I do not have this problem turning right. no matter how hard I lean into the...


run a stringline around the wheels, check wheel alignment, check wheel bearings, tyre wear. swingarm bearings, bent handle bars, fork twist. stand back and see if it looks staight
some bikes will have some throttle effect when turning, if you thottle off, it may drop further into the corner, but check all others first, could be something dangerous

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great news you can only win with this. i bet if you pull a spark plug and look at it, it will be white or close to it. if so your motor is lean, it's not get the right amount of gas. when you put pipes on a bike it lets more air flow and you need to jet your carb. you local bike shop can help you get a jet kit and handle the install if needed. when done right you get more performance out of it. while you are look into jets get a high flow air filter or look into a hyper charger they come a jet kit, k&n air filter and the air scoop price isn't bad rsports.com/wps/Honda_OEM/HondaMC.asp?Type=13&A=474&B=25

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I just purchased a 2003 Honda vtx 1800 with acustom diamond seat.


Should be a hex bolt on either side towards the rear of the seat ahd a 10mm bolt at the rear of the pass. seat.

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Bike backfires and misses.


Run some Seafoam through the carbs. Should be available locally at a parts store. Mix with your gas according to directions. This will clean out the carbs, which sound like they are a little gummed up.

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