Question about 2004 Honda VTX 1300

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Honda 1300c backfire through carb at wide open throttle. I have open up the exhust and rejetted the carb . the bike will run fine up to mid throttle or 65 mph but if you accellerate hard or go to wide open throttle it startes popping through the carb . i still have the factory intke ,air box and filter.the plugs are new also. i have 2006 Honda vtx 1300 with 2 1'2 pipes and hypercharger on it.. on recently ever time i decelerate it start popping how do i fix this.

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  • Anonymous Mar 12, 2014

    changing throttle grip on 2006 honda vtx 1300c

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If you have used Dyno jet kit I have had a kit come through with smaller main jets than the stock ones causing it to run way to lean.

Posted on Jun 01, 2009

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Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

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Are you talking about "backfiring" out the exhaust or "spitting back" through the carb?

Backfiring through the exhaust under acceleration is rare. If he ignition is misfiring, unburned fuel and air mixture is exhausted into the exhaust system. The next time the plug fires, it ignites this mixure. In other words, your engine is "missing" and your ignition system needs attention.

If it's "spitting back" out of the carb, this is usually an indication of a lean mixture. If it's doing it at wide open throttle, you might need to go up one size one your main jet. If it's doing it under less than full throttle acceleration, raise your needle up one notch and try it again. You want to richen the mixture just a bit. Too much and the bike will get sluggish.

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your carbs are dirty. and probably need to be balanced also... bring the bike bto a garage and have them cleaned by a profesional.... also after market pipes don't give your bike the proper back pressure .. that can mess up your carbs timing

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Honda 1300c backfire through carb at wide open throttle. I have open up the exhust and rejetted the carb . the bike will run fine up to mid throttle or 65 mph but if you accellerate hard or go to wide open...


Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Please rate this solution. Thanks!

Mar 30, 2009 | 2004 Honda VTX 1300

1 Answer

Exhust


just make sure you rejet the carb all bikes come from the factory on the lean side to meet epa standards etc. if you dont rejet you'll actually lose some power and have nasty backfires as well take the time to put a jet kit in i personally recommend dynojet easy to install and comes with suggestions for your application

Jul 21, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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