Question about 1998 Honda CBR 250 RR

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Has spark, fuel, turns over but will not start

Its a 98 Honda CBR900rr,..Any ideas on what it could be?

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  • Larry Randall May 11, 2010

    have you checked the compreession

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3 things are needed for combustion (compression, fuel/air mixture & spark).

turn the key on. can you hear the fuel pump running to pump some fuel into the carbs? if no sound, then it might be a fuse or relay, or the fuel pump inself.

if you hear the pump clicking, then next try this. petcock on try and crank it. try for a few seconds (<10 sec) to give a start. stop cranking and immediately pull out a few of the plugs. are they wet? if they are, then fuel is making it to the cylinder(s). if dry, then no fuel to the carbs. check fuel filter & vent.

next turn to spark and see if that fixes it. don't look at the spark, but replace them. it has for me on dirt bikes and ATVs. one minute it was running, shut it down for a break and when trying to restart, nothing. changed out the spark plugs and she's back to life. never had good luck with NGK plugs.

worth looking at the air filter too. make sure you can still see light through it when holding it up to a light. and you should feel/hear a suction while trying to start it which means the passage to the carbs are clear.

take a look at the plugs themselves. is it black (like its running too rich?) or is it very white like a new plug (lean condition)? should look like light brown toast if its running right. throw in a few new plugs (properly gapped of course) if they look black and give it a try.

if nothing from above works, then go with lrandall's recommendation and check compression. you can rent one if you don't have one.

good luck.

Posted on Jan 27, 2009

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