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Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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Old 04-10-2011, 11:22 AM   #1 (permalink)
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Default Ninja 500 Loses Power

Hi,

Thanks in advance for the help

I was just about to sell my great condition '05 Ninja 500 and upgrade to a bigger bike, and it started having an issue.

The issue is that it will randomly lose power. I can go days with it driving perfectly, and then randomly while riding it feels like half my engine isn't working, especially at high rpms. I can't even past 4k rpms, and I usually have to hit the slow lane or get off the road. Since I'm not a mechanic, the best way to describe it is if it had two things that are pumping the engine into working order, only one of them is working. It happened tonight on the way home from work, so I drove around a parking lot for a half hour until it started working normally again, and then bam..it just switches back to normal like nothing happened.

I use premium gas.

My question is..how or what do I fix?

Thanks!
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Old 04-10-2011, 11:31 AM   #2 (permalink)
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Has it been serviced, I believe it is carberated isn't it? I would have the carbs serviced and sync'd. Tell the shop what it is doing and they will help troubleshoot.
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Old 04-10-2011, 11:33 AM   #3 (permalink)
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no it hasn't..what should that run..about $400?

Thanks for the response!
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Old 04-10-2011, 11:35 AM   #4 (permalink)
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Quote:
Originally Posted by blackbike View Post
the best way to describe it is if it had two things that are pumping the engine into working order, only one of them is working.
There are two things pumping the engine into working order, they're called cylinders. You have two of them, and it sounds like one of them cuts out.
My bet is in a little dirt blocking off the jets in the carburetor. As it sits the dirt can float away and clear up. Another possibility is that you have bad ignition wires or boots. It would backfire a lot if it was this. If you don't know what any of these terms mean then you should take it in someplace.
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Old 04-10-2011, 11:35 AM   #5 (permalink)
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labor rate around here is 75 an hour so it would be 300 for carb here
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Old 04-10-2011, 11:39 AM   #6 (permalink)
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Ok great, thanks guys. I just wanted to go in to a shop with some knowledge because where I'm from if you don't they screw you for $1200.
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Old 04-10-2011, 11:42 AM   #7 (permalink)
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By the way, i wouldnt let just anyone handle my carbs. It can be tricky and the jets enos speak of, are the heartbeat of the carbs. It will need to be completely dismantled and run threw a ''carb vat''. After reassembly, they will have to be sync'd. you can try removing floatbowl drain screws after turning your petcock valve off and see if any trash comes out.
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Old 04-10-2011, 11:44 AM   #8 (permalink)
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Hell, leave the petcock open and let the fuel free flow. This may not correct the issue. Has it sat up at all? Bad gas was the number 1 culprit when I worked at a shop that specialized in older/carberurated machines.
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Old 04-10-2011, 11:45 AM   #9 (permalink)
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Alright..I'll figure out what all that means :b .. maybe I should keep this one just to tinker on and learn the mechanics..
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Old 04-10-2011, 11:46 AM   #10 (permalink)
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Quote:
Originally Posted by splane750 View Post
Hell, leave the petcock open and let the fuel free flow. This may not correct the issue. Has it sat up at all? Bad gas was the number 1 culprit when I worked at a shop that specialized in older/carberurated machines.
I just came down to FL and the issue started here. People are telling me it happens to them because of ethanol in the gas?
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Old 04-10-2011, 11:59 AM   #11 (permalink)
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Could be. Ethanol isnt Motorcycle friendy in mine and a lot of peoples opinion. Allows for a percentage of water in your gas as I understand it. Gas that sits up breaks down and builds a residue. Some of the jets are so small that you can't barely see through them holding them up to light. When the residue builds it slowly chokes your machine to death and it dies, a slow, painful, death. RIP

The floatbowl is the very bottom ''bowl'' looking objects on the carb. There willl be a screw on the bottom usually positioned where a line coming out for drainage. If you loosen this screw you will see fuel begin to drip then stream out according to how much you open.
I have heard CFOAM helps with water in fuel but have no first had experience.
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Old 04-10-2011, 12:07 PM   #12 (permalink)
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Ok I'll try draining. And probably get some ethanol treatment. c-foam is good but some locals are saying there's a product that's better. Not the sta-bil one but I may try that.

Thanks for your help splane750. by the way the new bike I'm looking at is a gsxr 750 ('06). I see that's what you have.

Oh ps..what's "has it sat up at all" ... what's "sitting up" ? I always have the bike standing but I'm sure that's not what you mean. And I've rode it at least 3 times a day for the past 9 months...it's my only vehicle.
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Old 04-10-2011, 12:14 PM   #13 (permalink)
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Sitting up means, sat aside. Not ridden. Put up. Stored. This is not the case for yours so I would check the fuel filter and drain like suggested.Try those and google your floatbowls. Ohh that sounds kinky.
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Old 04-10-2011, 12:30 PM   #14 (permalink)
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Quote:
Originally Posted by enos View Post
There are two things pumping the engine into working order, they're called cylinders. You have two of them, and it sounds like one of them cuts out.
LoL ^^^

That was a pretty funny post by the OP. But guys if his problem is intermittent it's probably an ignition issue. Could be coil, bad spark plug wire, bad spark plug or just a bad connection somewhere.

A carb issue doesn't make a bike randomly stop working, it'd be consistent. If OP is trying to sell bike i wouldn't pay someone to dive into the carbs, especially when a bit of seafoam often cleans everything up even when that is the issue.
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Old 04-10-2011, 01:00 PM   #15 (permalink)
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Quote:
Originally Posted by usernamedoug View Post
LoL ^^^

Could be coil, bad spark plug wire, bad spark plug or just a bad connection somewhere.
I haven't ruled out ignition altogether.
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