Question about 2002 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

My 2002 honda vt750 shadow ace backfires while decelerating. all original equipment carb and exhaust. when i pull out the choke it's fine. is it running too lean or is it something else? if it's lean where are the adjustment screws? it has 7000 miles. Mario

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  • mariocrone May 27, 2010

    my 2002 honda vt 750 shadow ace backfires during deceleration. problem stops if i pull out the choke. plugs have a nice tan color burn and dry no gas odor. could it be too lean?

    mario

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2 Answers

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If you are decellerating in gear, then the backfiring would likely be caused by just the natural forced ignition advance that is caused by that. The problem could be exacerbated by a possible need for a valve gap and timing adjustment.

What you are describing is very common. What you are doing when you gear down to slow down is to force an advance in the ignition. That will cause backfiring. It should not, however, cause the motor to stall. Have you had the valves adjusted at the appropriate intervals? The problem could have an additional relationship to that as well.

By gearing to slow down, you are not harming the bike so much as accellerating the intervals betwen valve adjustments. Remember that any time you force something like the ignition timing, you are forcing all of the other related components to advance as well.

As I said, it will not harm the bike, but it will force you to do the required related tune-ups a bit more; this does include the carb synch as well.

As far as the engine stalls, it doesn't make sense that the issue is related to the backfiring. More likely, the problem is triggered by something that is happening when you do that. Possibly with carbeuration or electrical. Check for any shorted wires in the main power or ignition system that are not secured properly.

Hope helped, and good luck.

Posted on May 27, 2010

  • ZJ Limited
    ZJ Limited May 27, 2010

    I suggest take off the air cleaner and look in the carb. There is a plastic
    venturi there that sticks. it will free up with your finger; check fuel fillter, but does sound like carbs need a clean out... jets
    will be made up with crud if bike has been stood over witner petrol
    goes off in them and makes jets up. in other case, would be a idea to replace
    sparkplugs as well, but you say that this are good. Tell us news.

  • mariocrone May 27, 2010

    thanks,



    valves were adjusted as recommended at 2500 miles. the engine does not stall. it has 7000 miles and i believe the next scheduled valve adjustment is recommended at 25000 miles.



    i've been running 93 octane, should i go back to 87?



    mario

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Hi! You may have fuel flooding. Try replacing the spark plugs for better fuel burning and spark plug wires for better current supply to the plugs. This will help eliminate fuel flooding. Hope this helps and good luck!

Posted on May 27, 2010

  • mariocrone May 27, 2010

    is there a special socket to remove the plugs? what's the recommended gap?

  • dj_relly999
    dj_relly999 May 27, 2010

    The gap should be .035, use the sparkplug socket that comes with the bike. If non, you can buy one. Just ask them to give you the one used for motorcycles. Good luck!

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Pleas rate this solution. Thanks!

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