Question about 2007 Honda CRF 250 X

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2007 Honda CRF 250 X hard to start

Why is my bike very hard to start and when I get it started it misses and breaks down like it is starving for fuel it also backfires when it starts

Posted by Anonymous on

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  • 39,907 Answers

Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery damaged or nearly discharged, should have 12.5 volts.
4. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
10. Choke valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition is not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
CRF250X Hard Starting 4Strokes com
honda CRF250R Hard to Start
Honda 2010 CRF250R Service Manual
Honda CRF250X 2007 Owner Manual Competition Handbook

Posted on Aug 03, 2017

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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: bike won't start or wo't stay running

if air is entering the carb anywhere but the intake boot then you will have problems. if the crack is in the float bowl then you are llucky..if big deal you can get a carb cheap from a slavage yard or buy it new ...if there is a crack in the air boot then it will need to be mcguyver repairs on that

Posted on May 03, 2009

  • 1392 Answers

SOURCE: bike backfires and misses.

Run some Seafoam through the carbs. Should be available locally at a parts store. Mix with your gas according to directions. This will clean out the carbs, which sound like they are a little gummed up.

Posted on May 30, 2009

  • 3567 Answers

SOURCE: Bike is sometimes hard to start.When bike stalls

There is a proper way to start the engine. Four controls are on your bike to assist in starting.

  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Posted on Jun 29, 2009

  • 431 Answers

SOURCE: engine missing/ backfiring, no pulling power

Hi I am vortash sounds to me like an ignition lead short check that the leads on the pot are not sparking to earth effectively cutting off the spark to one cylinder ( electricity takes the shortest point to earth so wont reach the plug if sparking to the cylinder ) I think youll find if it was the Kick stand sensor it wouldnt even fire up .. ? check all your HT circuit for damp or damaged leads .. hope this is of help regrads Vortash

Posted on Jul 21, 2009

  • 1564 Answers

SOURCE: no fuel to carb, I think..

I would check the vacuum line that opens the fuel feed valve. It's located right under the fuel shutoff valv and is fed by the #2 carburetor.

Posted on Aug 16, 2009

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I have to have the choke all the way on in order for my bike to run, an when i do get it started it back fires an like its starving for gas, we didnt ride it much last year, went to put it away last season...

Did you clean the air filter ?. The bike will miss like hell if it is starved for oxygen.
The Air filter is normally a sealed box with a curved air intake and a rubber hose connected to the carburetor. Open the box and clean the sponge filter with petrol and squeeze it dry before reassembling. If you have access to 2T engine oil dip the sponge in it and squeeze dry before reassembling.Back firing does not indicate starving for fuel .

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