Question about Harley Davidson FLSTS Heritage Springer Motorcycles

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Flsts carb gasket dried out. How do i replace it.

It is hard to keep running after starting or idleing. any deceleration causes back fireing. hearing loud air "sucking" noise at intake.

Posted by Anonymous on

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  • Harley Davidson Master
  • 3,506 Answers

Remove filter and back plate and loosen and free up the enrichener and disconnect the fuel supply and vacuum lines and pull carb away and then you can replace the carb seal. If you have an intake leak at the heads that will require more work.

Posted on Nov 26, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

rselvy
  • 83 Answers

SOURCE: 2002 crf450, rough running, back firing, hard start

Classic valve train issues. Sounds like the valves are tight. One thing that concerns me is the "sudden onset". Valves usually tighten over time.
Make sure you also tighten the cam chain as well.

Posted on Dec 27, 2008

BearWeb
  • 357 Answers

SOURCE: Yamaha 2002 TTr 250

Hi hoeygatt

Look around your bike near where the throttle cable meets the engine, when you pull the throttle, the cable pulls a quarter circle piece of metal which is connected to a spring, then connected to that should be a screw, that is the idle screw, turn it very slightly, usually clockwise to make the idle higher, and this should sort out the problem.

Please remember to rate this solution as FixYa!

Kind regards
BearWeb

Posted on Apr 12, 2009

raffaiel
  • 209 Answers

SOURCE: i have a 1994 1200 sportster that back fires

try to adjust the air of the carburator to obtain a equal mixture of gas and air try to clean your spark plug as well.

Posted on Apr 16, 2009

  • 3567 Answers

SOURCE: starts and stays running with choke on. stalls

Pay special attention to the parts in red. DO NOT mix parts from the front carb with parts from the back carb. When removing adjuster screws and jets, count the number of turns to remove them, write it down, and replace with the same number of turns.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Go to this site and you can download a free PDF service manual.
www.carlsalter.com/motorcycle-manuals.asp Most all of the manuals are in English but some are not. There is no way to be sure without doing the download. You can always delete it if in a foreign language.
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Posted on Jul 02, 2009

  • 1 Answer

SOURCE: when it warms up it miss fires

I had the same problem with my 04 1200C. It was a defective crank position sensor. replaced the sensor and no problems since.
Good Luck

Posted on Aug 30, 2009

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1 Answer

What or symptons of incorect valve adjustment on 250 honda recon? the exhaust pipe is turning red, hot after running or idling for a short time. also back fires.


has nothing to do with valve clearance!
You are running to lean at idle.
Your idle jet is most likely plugged up!
Do not drill out, blow out with carb cleaner and compressor. If it is too plugged up replace it. Mixture screw should be at about 2 turns out.

Im guessing right now it will only idle with the choke on, or run with the choke partially on. When you let off the throttle off, deceleration it back fires the most.

I do recommend having a trained tech service the carb!

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Maybe float level is low. If possible split top off carb to observe wet level inside carb. Thinking 2 things for deceleration that changes pressure in fuel line is volume push by fuel towards front components and maybe Evaporative Emissions is getting solid fuel instead of vapors from splash.

Idle dashpot is part on some early carbs to allow throttle gradual closing. Some are vacuum controlled with what is called a "vacuum tree" which routes the vacuum to the dashpot by temperature. Vacuum tree could have wrong hose routing or THERMOSTAT for engine could be too cold.

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Back fires 24/7?????????????????


Backfiring can be caused by fouled spark plugs (you have four,two per cylinder), bad spark plug caps, bad air cut valves on the side of the carburetors, but most likely leaking exhaust gaskets. I am guessing that you have changed the exhaust system but did not put new crush o-rings between the cylinder head and the head pipe. You should also change the tubular gasket/seals between the head pipes and the mufflers. If this does not fix the problem , take out the two screws that hold the air cut diaphragms in place and remove the covers . If the rubber diaphragms have holes in them or have become sticky they need to be replaced. Air cut diaphragms turn off the fuel during deceleration to prevent back firing. If they go bad they can cause poor running , popping , and back firing during normal operation.

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1 Answer

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Have you tried new spark plugs? One fouled plug or bad spark plug cap can cause backfiring. Possibly dirty carbs ( a stuck float). Backfiring on deceleration can be caused by bad exhaust gaskets where the headers attach to the head (an air leak)

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