Question about 2005 Honda CRF 450 R

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2005 crf450x won't start

I am getting spark and the cdI was just replaced. The bike burps over,but won't stay running.I am clueless....

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Sounds like its fuel starved.when bike stalls, remove plug and if it is dry, fuel problem. check any fuel filter and the carb bowl

Posted on Jul 30, 2009

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Hi i have a cr250 what wont start. i have checked electrics. it has a spark. just changed cdi unit. petrol flowing. any ideas?


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82 Yamaha xs400 maxim. I keep burning up CDI. New CDI and bike runs great. If it goes on a long run (over 45 min), the idle speeds up and the next day the CDI is dead. I put and old one back that runs for...


Hi,
The CDi usually breaks down when it gets an over voltage from the voltage regulator.
Try to replace the voltage regulator so that the CDi won't overheat.
Check also the ignition coil, it might have a short circuit it the connection terminal or the polarity is wrongly placed.
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I have a NC30 that has been standing for about a year, the only reason for that is CDI issues. I bought a De-restricted CDI from Japan, replaced the Spark plugs and checked all fuses and connections. I...


Check your CDI on the other bike is a good option. if it was perfect before the CDI change then the new CDI is the only variable.
Wont be shimming.the valves need to wear to change that setting, and the bike has been sitting.
Sounds like its sucking air after the carby once over, but the balancing would have picked that up.
But how did you balance them if its idling at 5000rpm?
Recheck the carb once over,and balance, and make sure the fuel and vacumn tubes are in correct positions. check the throttle cable is replaced correctly
I assume it is running on all cylnders.

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Took my bike out, WR450f 07 model, got to the shop and had something to eat, came out and bike wouldn't go, headlight globe was blown, actually smashed, was no spark so replaced spark plug and checked...


My thoughts...Light globes are made to withstand voltages of less than 16 volts. So if you are finding your headlight globe burnt out, it's because the system voltage has exceeded this. Have your voltage regulator replaced which will remedy the problem. Over voltage will have an effect on other electronic components such as the CDI unit and wreck your battery too.

Apr 07, 2010 | Yamaha WR 450 F Motorcycles

1 Answer

Fresh rebuild now no spark


If it ran before, I would double check your electrical connections. Its more likely you didn't get a connector pushed all the way together or left off a ground wire. The ignition coil specs are generally 1 ohm or less on the primary (small Wire) side, and 5K-10K ohms on the secondary (spark plug) side. Each side should be tested to ground. Pick-up coils are typically open or really large ohm reading in Megaohms normally and around 100 ohms when the magnet on the flywheel passes by. there is no way to test the CDI box other than putting it on a know running bike or getting a known good CDI and putting it on your bike. Double check that the spark plug cap is secured to the high tension lead as well. Testing the stator is a little more complicated, but a quick way is to close the gap on an old spark plug to about 0.010" and see if there is a week spark. If so, the stator will need to be replaced.

Jun 16, 2009 | 2003 Suzuki RM 125

1 Answer

No spark


I too have a 1087 Honda Shadow and after we rebuilt, cleaned and painted the bike, it would not spark.

Behind the battery, check the CDI box. Look inside and shake upside down, looking for the presence of water. Once we completley dried out the unit. The bike runs like a champ.

the other day I rode in the rain for 160 miles. Engine died. Went to the CDI, water was there. Dried it out and again the bike runs fine. I am going to seal my cdi unit now. and hopefully the problem will not come back.

Richard
Colorado

Mar 30, 2009 | 1987 Honda VT 1100 C Shadow

1 Answer

Bike won,t start.has spark


see for weather the CDI unit is working properly a less C.V. may cause such problem too check the spark plug for better igneting capability or the spark plug is in worst condition then replace it with new , & U have'nt mention that your bike is a fuel injection or a carbeaurator varient see for it & then let me know so that i can help you out fearther with what trouble you come with see you soon....

Mar 23, 2009 | 2003 Honda CRF 230 F

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