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Steve Kurk Posted on Jan 20, 2019
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New carb. But idles fine then backfires as you throttle up

1 Answer

CJ Rock

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  • Master 4,429 Answers
  • Posted on Jan 20, 2019
CJ Rock
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Likely idle mix too lean. But other as well.

5 Related Answers

Anonymous

  • 2 Answers
  • Posted on Dec 18, 2008

SOURCE: kawasaki brute force 750 2005,

Your jetting on the carbs are wrong.

if you want more info on the jetting and how to do it along with some GREAT info, check out highlifter.com/forum

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bennyde

  • 6 Answers
  • Posted on Oct 03, 2009

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.

wadembly

Wade Mobley

  • 513 Answers
  • Posted on Nov 13, 2009

SOURCE: Polaris 500 idles fine but when i give it any gas

the idle air mixture might be off or sometimes a bad spark plug can cause it

mwoodring1

mark woodring

  • 498 Answers
  • Posted on Jan 05, 2010

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

vac leak craked boots

tombones

  • 3567 Answers
  • Posted on Feb 09, 2010

SOURCE: wont idle unless i havethe throttle barley turned

The idle circuit is still plugged up or it would not be giving you this problem. Remove the carb and dis-assemble it then soak the parts in denatured alcohol for 30 minutes. Then use a spray carb cleaner to finish the job. Spray into all the little holes in the carb body. Especially spray into the air screw and throttle screw holes. Reassemble the carb and LIGHTLY seat the air and throttle screws then turn each of them one and one half turns outward. This is the factory setting. Before putting the slide back into the top of the carb, move the clip on the jet needle one notch lower on the needle. This will richen the low end fuel mix. Install a new spark plug and clean the air filter. Please rate my answer. Thanks.

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