Question about 2002 Honda CBR 600 F(4)i

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Have a crf450 and it will not start. There is spark when the fuel pump is removed, but there is no spark with the fuel pump is installed.

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Check the alternator and regulator/rectifier

Posted on May 14, 2014

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dmsr63
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SOURCE: My `04 crf450 started popping and running like

Popping and running bad, is still running, are you sure you lost spark? Or maybe the timing jumped.

Posted on Aug 30, 2010

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Hi, Anonymous if your carburetor/exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
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BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
2005 crf450 Popping
05 crf450 backfire
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
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1 Answer

Replaced bad fuel pump, installed new relay and fuel filter, engine turns over but is not firing on..... positive the fuel pump is pumping gas and checked to see if gas was going thru fuel filter. Tried...


Hi, Ok you have confirmed that it's not a fuel problem. You need to check for spark. Pull the coil wire off of the coil(secondary lead-looks like a spark plug wire) Have some one crank it over and listen for a popping sound. IF yes, spark is at the coil, that means all ignition sensors are working. Next check for spark at ends of wires after cap. IF no replace cap and rotor. IF yes remove a couple spark plugs and check for fouling(wet, fuel etc...) IF yes replace or clean plugs and retest for starting. IF no spark is present at coil you need to scan computer and watch for rpm signal. IF no rpm signal, replace crankshaft sensor with OEM delco part. BIGGEST problem with these engines is Cap and Rotor burn out.

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Once any air leaks are corrected, adjust the idle mixture screw to attain the highest idle speed when the engine is at normal operating temperature. Then, use the idle speed screw to set the correct idle speed.
Finally, ride the bike at full throttle for a short time, pull the clutch and coast to a stop. Remove the spark plug and check the color; a tan or light brown color indicates correct jetting. Too light = too lean. Too dark = too rich.

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If it is hard to start after it stalls, it is probably getting too much fuel. Could be dirt in the float valve. Also try running a hotter spark plug

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