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Honda CBR 600 Discussion of the Honda CBR 600F1, Honda CBR 600F2, Honda CBR 600F3, Honda CBR 600F4, Honda CBR 600F4i, and Honda CBR 600RR Motorcycles.

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Old 07-04-2012, 3:00 PM   #1
 
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CBR Loses Power "Runs Out of Gas"

Hi There,
My name is Andrew, I am new to the site, new to motorcycles and new to riding. I just recently bought a 1998 CBR600 and upon riding it home, the RPMS dropped suddenly and died. I was in I think second around 6 or 7000 RPM. I have checked the tank breather vent for vapor lock but it is clear. Also I drained the carb floats and replaced the gas and it started right up. I then road it around a parking lot for 2 hours, in first in low RPMS and it didn't cut out once. I thought the problem was old gas. I then took it out this morning and sure enough once I got up into higher RPMS it chocked and died and I couldnt get it started for the longest time, finally bump started it and made it almost home as I slowed down it died again. I ended up pushing it the rest of the way home. So I have down TONS of research on the net but I would just like to see if anyone has some ideas I haven't heard you. It can't be vapor lock I think because I checked the breather on the tank, is there any other way it could be a vaccum lock? Also I am pretty sure it must be running lean for it to lose power and die like that, could it be too much or too little air? Could it be a clogged fuel filter or petcock? Or could it be the fuel pump or a relay? Lastly could it be simply something like to little oil? Is there a sensor that when the oil gets to hot or something it shuts off the bike? I don't think it's electrical as all the lights stay on when the bike's RPMS die. The worst is all the people who have the problems on this site, and once it's fixed they don't come back and say what it actually was, so I will definitely reply what the problem was once it is fixed if we can all figure this out? Thanks for your help guys and glad to be a part of this forum!
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Old 07-04-2012, 4:08 PM   #2
 
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Re: CBR Loses Power "Runs Out of Gas"

Check for rust in your tank, under high fuel demand, the fuel pickup can get clogged up, happened to my buddies srad 750.
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Old 07-06-2012, 12:48 AM   #3
 
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Re: CBR Loses Power "Runs Out of Gas"

Here is an update if anyone is following. I took apart the bike today. I stripped off the carbs, and to my disappointment they were SOOOOOO clean. Like they had been recently serviced, which scares me because maybe the PO sold it to me because he couldn't figure out what was wrong with it. I made sure when I reassembled it no vacuum lines were kinked or anything. Could it be an overheating thing or still a vacuum or vapor lock? It will run for a few minutes then it just seems like it runs out of gas. Or maybe it is running to rich and flooding? The air filter was a K&N filter which seemed quite new, is that aftermarket and could it be running the fuel to rich or lean and choking the engine? Any help would be greatly appreciated! This is my first bike and it is brutal that it is being a lemon so far...
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Old 07-06-2012, 12:51 PM   #4
 
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Re: CBR Loses Power "Runs Out of Gas"

Also not sure if it matters, but it smokes upon each start up. Then after a few minutes of idling it levels off. I am going to check the spark plugs maybe the are fowled and need replacing, could bad spark plugs let the engine flood? Or overheat or something?
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Old 07-06-2012, 1:18 PM   #5
 
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Re: CBR Loses Power "Runs Out of Gas"

Have u checked th battery or charging system? A faulty charging system an low battery will cause th symptoms ur describing.
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Old 07-06-2012, 3:53 PM   #6
 
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Re: CBR Loses Power "Runs Out of Gas"

Nah shouldn't be vapour lock as your fuel pump is submersed in the tank at its lowest point. Try running the engine with the fuel filler open - if the vent line is blocked it'll run with it open, but not with it closed (after a period of time).

What colour smoke is it? White, blue, black?
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Old 07-06-2012, 4:28 PM   #7
 
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Re: CBR Loses Power "Runs Out of Gas"

I haven't checked the battery system yet, I found a good flow chart on how to check each part of the system so I have the battery trickle charging now and will test it in a bit!

As for the colour of smoke I am not exactly sure... I always have found it hard to distinguish the different kinds either for blown head gasket, burning oil, or running rich
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Old 07-06-2012, 4:48 PM   #8
 
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Re: CBR Loses Power "Runs Out of Gas"

Why not take a video of it, and post to youtube?
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Old 07-07-2012, 1:21 AM   #9
 
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Re: CBR Loses Power "Runs Out of Gas"

Okay, so I tested the battery while it was running. And it seems that it will idle, then the radiator fan comes on and it will drop about 0.4 volts and it will falter and try to die. I then rev it and hold it at high revs, then it will idle for a bit, then try and die again. When it was idling earlier though it was slowly charging, could heat somewhere make it leak or lose voltage?

Also I looked at the smoke and it is either white or bluish, I think more white though. I have some videos to post soon.

Also I noticed that it likes to every once in a while lightly backfire, sort of like a puff every now and then, any ideas?

Thanks again everyone for their input so far, and keep it coming, it really is appreciated and I am really trying! Thank you!
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Old 07-07-2012, 6:10 AM   #10
 
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Re: CBR Loses Power "Runs Out of Gas"

What voltages were you seeing exactly?
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Old 07-07-2012, 3:30 PM   #11
 
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Re: CBR Loses Power "Runs Out of Gas"

If you bought it with a problem it could be anything including people messing with bigger carb jets / needle settings etc or float settings. Common bike problems are regulator / rectifier or (mitsubishi) fuel pump.
The fuel pump can cause intermittent fueling due to failing contact pads in rear of pump.
If yours is a 1998 F3 the fuel pump is attached to the frame and easily checked, the contacts are replaceable. If it is a dodgy fuel pump relay then this can be jumped by a piece of wire.
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