Question about 2004 Honda CRF 250 X

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86 honda shadow VT500C flat spot in throttle about 1/4 throttle

VT500C honda shadow, just bought, been in storage 3 years. Have gone thru bike, serviced carbs(dirty), new plugs, etc. Starts up and idles great, flat out acceleration is great, but normal driving it seems to have a dead spot in the throttle - and when you give it a little more all of a sudden it's like it wakes up and hauls it. This model does not have mixture screws on the carbs, it was running fine when parked, bike only has 11,000 miles on it. I checked compression, running about 165, so no problem there. Any ideas?

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The carbs are most likely clean, especially if they were soaked in real alkaline carb cleaner. Honda Shadows are very fussy about incoming air. If the air cleaner intake box is not fastened securely to the carburetor intakes the engine will run lean. The reason for the lean mixture is there is not enough negative pressure with the airbox disconnected and the carbs get too much air and not enough fuel.

Posted on Sep 15, 2015

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Posted on Jan 02, 2017

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SOURCE: 1986 honda shadow vt500c throttle hesitation.

If your bike has carbs and not fuel injection, ( difficult to remember back 23 years ago ), then remove the carb slides and move the clip on the jet needle down one notch. This will richen the low end mix and provide it sooner. You may need to go two notches but start with one notch. Also, sync the carbs such that the slides on both carbs move at the same exact instant when the throttle is slowly turned from idle speed < engine off. Clean the carbs when you get a chance.

Please rate this solution. Thanks Cindi!

Posted on Apr 30, 2009

  • 10 Answers

SOURCE: I have a 85 Honda Shadow vt 500. Engine is surging

did you clean all the jets good sounds like it may be in the jets and needle part of the carbs

Posted on May 07, 2009

chadschloss
  • 11 Answers

SOURCE: magna engine surges

The carbs may need to be cleaned. Try running seafoam in the tank first and see if that clears some of it up. The slow jets may be plugged up inside the carbs. If the snorkel had been removed from the airbox, it could cause siminlar problems as well. have you changed the spark plugs yet? be sure to check out the Honda Magna forums for more info:

http://forums.delphiforums.com/MagnaRiders
http://www.magnaownersoftexas.com/forums/
http://v4hondabbs.com/

Posted on Sep 08, 2009

  • 6 Answers

SOURCE: 2002 HONDA SHADOW ACE 750 CARB

It sounds like you may have or will be jetting your carbs. I did this using the directions with the kit and used the Clyman manual for this bike to show me step by step how to remove the carborator. You will only need to attach 2 of the 4 hoses on your carb. syncronizer. If I remember right, you need to remove the bolt-on cooling fins to expose the engine block. The is a black screw or bolt that you take out and screw the threaded metal adapter of the sync tool. Be careful using the sync tool. Be very light on the throttle or the vacuum in the cylinder will **** in the mercury from the sync tool - not good. The problem you are stating on idle & backing off sometimes happens when the carbs are running rich (too much fuel) Hope that gets you in the right direction.

Posted on Oct 03, 2009

mwoodring1
  • 496 Answers

SOURCE: 2001 Honda Shadow ACE 750 idles, but won't rev up

vac leak craked boots

Posted on Jan 05, 2010

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