CBR F4i not starting - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 13 (permalink) Old 05-04-2006, 02:52 AM Thread Starter
 
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CBR F4i not starting

Guys, I'd really appreciate your help on this. My bike is a 2002 CBR F4i with around 6K miles on it. I bought it a few months back.

The bike was running fine on Apr 22nd, no issues. I hadn't started my bike for 1 week and when I tried to start it on Apr 29th (this Saturday), it would not start. The lights came on, fuel pump charged, and the battery was turning the engine, but the engine wouldn't start.

First, the simple fixes:
1. Kill switch is on.
2. Bike is in neutral. Side stand is down, but that doesn't matter since bike is in neutral.

I also checked the following:

1. Did the flooded engine procedure, with throttle fully open and start button pressed for 5 seconds. No change except I drained the battery.
2. Recharge the battery with a trickle charger, and also tried jump starting it with a car on a separate occasion, no change in symptoms.
3. I tested each spark plug for sparking, by taking out one at a time, and grounding it against the chassis, all of them sparked. They looked old, but not worn out.
4. No blockages on the air intake. No obvious blockages on the exhaust.
5. Could faintly smell the fuel when the engine turned. I'm assuming this means that fuel is delivered without any issues.

Could something be wrong with the fuel pump ? Circuits that I can check ? Can I rent a diagnostic somewhere and run it ?

Appreciate your help !
thanks!
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post #2 of 13 (permalink) Old 05-04-2006, 12:16 PM
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This stuff sucks and it already souns like you have a good start.

Have you check your fuses?

Are we sure the fuel pump is coming on? Disconnect the fuel line and see if it spits!

Do you have a fuel filter? Is it clogged or gummed up?

Is the gas in the tank good? How old is it?

Are we sure you didn't kill the battery. I have seen bikes before not run cause the battery is sooo bad that the newer bikes and all the sensors won't let it run.

Have you checked the tip over sensor?




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post #3 of 13 (permalink) Old 05-04-2006, 12:20 PM
 
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You could just buy my bike. J/K. Good luck w/ that.
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post #4 of 13 (permalink) Old 05-05-2006, 03:14 AM Thread Starter
 
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Quote:
Originally Posted by Gas Man
Thanks

Quote:
Originally Posted by Gas Man
>>Have you check your fuses?
Yes, all of em are ok.

Quote:
Originally Posted by Gas Man
>>Are we sure the fuel pump is coming on? Disconnect the fuel line and see if it spits!
I can smell some fuel, but I can try this too. Where exactly is it ? Do I have to take the tank off, prop it against something and locate the fuel pump, or is it elsewhere ? I assume I would just disconnect the far end of the hose leading out of the fuel pump ?

Quote:
Originally Posted by Gas Man
>>>Do you have a fuel filter? Is it clogged or gummed up?
I'm not sure where the fuel filter is, can you help me locate it and do I just take it out and check for clogs ? Is it reusable after taking it out ?

Quote:
Originally Posted by Gas Man
>>>Is the gas in the tank good? How old is it?
Nore more than a week at the time this problem started.Now 3 weeks.

Quote:
Originally Posted by Gas Man
>>>Are we sure you didn't kill the battery. I have seen bikes before not run cause the battery is sooo bad that the newer bikes and all the sensors won't let it run.
The bike was cranking like mad when I jumped it, so it may not be the battery. It does run down after 2 or 3 6-second start button tries though. I also noticed that the battery voltage drops below 10V (to 9V) when I hit start. Time to change the battery ? It's only a year old and seemed perfectly ok 3 weeks back.

Quote:
Originally Posted by Gas Man
>>>Have you checked the tip over sensor?
No, but I assume if that's screwed up, the bike will not crank. ?

thanks !
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post #5 of 13 (permalink) Old 05-05-2006, 11:31 AM
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The fuel pump is in the bottom of the tank. But there might be some kind of special clip release to get the fuel line off either the pump or fuel rails.

The fuel filter should be under the tank. They aren't re-usable and should be replaced every 2 years depending on riding and gas/dirt quality.

Battteries can be bad after a year if not in good cercumstances. I suggest a constant jumped bike during this process to eliminate that as a possibility.

NO 100% sure on your bike. Some will crank and just not fire the fuel injectors.

I'm sorry but I'm no mechanic and just grasping at straws. Remember the basics.... After assuming you have compression and you haven't screwed up the timing. Fuel, Air, Spark. If you have those it should run. Carbed or FI, if your ECU is messed up for some reason you won't get all 3.




-Chris
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Was: 2002 Kaw ZX-9R
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post #6 of 13 (permalink) Old 05-05-2006, 03:28 PM Thread Starter
 
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CBR not starting: Replacement parts

Quote:
Originally Posted by Gas Man
I'm sorry but I'm no mechanic and just grasping at straws. Remember the basics.... After assuming you have compression and you haven't screwed up the timing. Fuel, Air, Spark. If you have those it should run. Carbed or FI, if your ECU is messed up for some reason you won't get all 3.
Thanks for the advice GM.

Any idea what are good places to buy thw following:

1. spark plugs
2. fuel filter
3. battery
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post #7 of 13 (permalink) Old 05-05-2006, 03:33 PM
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I have no idea if this suggestion will apply to your bike.

My 1985 Honda Interceptor stranded me once. Inside the fuelpetcock is a vacuum operated petcock. I think the design was to stop the fuel flow if you crashed the bike. The vacuum diaphram in the petcock had a leak resulting in no fuel to the filter.

Your results may vary!
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post #8 of 13 (permalink) Old 05-05-2006, 10:30 PM
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Fire... just your local dealer really. I don't know of anywhere to get any better deal on those particular items.




-Chris
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Was: 2002 Kaw ZX-9R
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post #9 of 13 (permalink) Old 05-06-2006, 10:25 PM Thread Starter
 
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Re: CBR F4i now starting !!

Whooooooo hooooo ! Got it to start.

It was the fuel system, I don't know where, but most likely the fuel injectors were clogged, which is surprising since it was sitting only for a week. Anyway, here's what I did:

Bought some starter fluid, sprayed it into the air intake manifold under the air cover. And started with battery jumped by a car in the off state (the battery was draining rapidly by now).

Took it out for a celebratory ride, it's running ok now, and starting within 2 cranks after pressing the starter button.

Thanks for the help, mates !
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post #10 of 13 (permalink) Old 05-07-2006, 08:52 AM
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So you used a bit of starting spray.... I can say I've never did that to a bike... I guess it got running and that's all that matters.

Now that its been a day is it still running ok?

You might want to run some injector cleaner thru it then as well...




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Was: 2002 Kaw ZX-9R
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post #11 of 13 (permalink) Old 05-14-2006, 04:53 PM Thread Starter
 
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CBR F4i - starting, but low mileage

It's been a week now and it's been running fine, but the mileage (mpg) has been cut in half. Are the fuel injectors dispensing too much fuel ? What injector cleaner do you recommend, GM ?
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post #12 of 13 (permalink) Old 05-14-2006, 07:02 PM
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I would use STP stuff you can get about anywhere!




-Chris
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post #13 of 13 (permalink) Old 05-15-2006, 12:00 AM
 
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Quote:
Originally Posted by f4fire
It's been a week now and it's been running fine, but the mileage (mpg) has been cut in half. Are the fuel injectors dispensing too much fuel ? What injector cleaner do you recommend, GM ?
The best way to find out what's going on in the cylinders is to pull your spark plugs (keep them in order). One or more injectors may be clogged or leaking, or a plug(s) may be fouled or not firing.

And a shot of starting fluid will work wonders on quickly troubleshooting an engine. If after a shot of ether the bike starts and then dies, there is a fuel problem. If the bike won't start with ether, there is an ignition problem.
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