Lost Top End Power - Kawasaki Forum :: KawasakiWorld.com
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post #1 of 45 Old 02-11-2017, 09:17 AM Thread Starter
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Lost Top End Power

I recently fixed a fuel leak by changing an O ring that was leaking in my fuel rail and now noticed a new problem. I noticed now that my 12R has totally lost its top end power. Bottom and mid range up to 8000 rpm its fast as normal but it falls flat on its face after 9000 rpm. Now I reassembled everything carefully and didn't forget to plug in and sensors so I'm thinking what the heck is going on? I'm gonna check to make sure I didn't kink a hose and that my boots are in good. Any other suggestions?
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post #2 of 45 Old 02-11-2017, 09:34 AM
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Fuel pump ?. seen similar posts in the past which have ended up being the pump.

*** ZX12-R ~ XJR1300SP ~ XR650R ~ DT175MX ***
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post #3 of 45 Old 02-11-2017, 09:56 AM Thread Starter
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Would it show a code? I was thinking I should rule out TPS and powercommander issues as well but ya pump is on my list.
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post #4 of 45 Old 02-11-2017, 11:08 AM
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yep the fuel pump, what year? if its 02 or later the filter is inside the black plastic pump housing and not replaceable do a search good luck Craig

if anything goes wrong check the battery
B1 black and "GOLD"
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post #5 of 45 Old 02-11-2017, 01:14 PM Thread Starter
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I double checked everything and found no kinked fuel lines also checked the boots on the throttle body are on tight and sealed. I checked my TPS and its ok closed throttle it reads about 1.0 and numbers increased slowly to max throttle 4.6. Also a friend of mine claims the PC3 needs an update every 1.5 years or so and thinks that could be the problem. Is there a way to check that vs the fuel pump/filter?
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post #6 of 45 Old 02-11-2017, 02:46 PM
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take your pump out clean the screen and give it a good shake then try it and see if problem is gone Craig

if anything goes wrong check the battery
B1 black and "GOLD"
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post #7 of 45 Old 02-13-2017, 09:04 AM Thread Starter
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I'm going to take the pump out clean the filter and replace with a new pump. I have the option of buying a new one in town from a Motorcycle tuner that sells a "race pump" for 130$ or getting one from High Flow fuel a company that gives a lifetime guarantee and who claim "our pumps maintain strict QS9000 quality standards, and are flow tested by RC Engineering, the US's most respected fuel pump testing company." There pump sells for 60$ so I'm very tempted to buy it. Anyone have an experience with them?

Thanks for the advice..
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post #8 of 45 Old 02-17-2017, 09:14 AM Thread Starter
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I took my gas tank off and drained the fuel but when I took the fuel pump out I found what I think is rust or possibly in tank flaking. CRAP!! No wonder things are plugged up.
Now I'm looking at cleaning that out of my tank and possibly having to re coat it? Any suggestions here are welcome.. I see some people using vinegar and others using a sand distilled water combo. Anybody have tips on how to restore my tank?

Thanks!
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post #9 of 45 Old 02-17-2017, 09:28 AM Thread Starter
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More pictures I just took... The front/top of the tank looks better than the bottom..
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post #10 of 45 Old 02-17-2017, 01:54 PM
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Just get another tank there are plenty knocking about on fleabay ?

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post #11 of 45 Old 02-19-2017, 11:44 PM Thread Starter
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Update..
I spent some hours cleaning the tank with evporust and it seems like its doing a pretty good job. Got the filter/fuel pump apart and I realize now that my new fuel pump has a plug instead of separate terminals. I think it will still work since I can cut and crimp the wires to the connectors provided. It looks like the kit "THE GAVEL" used successfully last year but not sure about his wiring. I see the strainer holder will need to be swapped to make it fit since it is rotated 90 degrees off the stock location. Anyone use this same setup who could chime in?
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post #12 of 45 Old 02-20-2017, 09:57 AM
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what year model bike have you Craig

if anything goes wrong check the battery
B1 black and "GOLD"
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post #13 of 45 Old 02-20-2017, 10:32 AM Thread Starter
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2003 ZX12R.

I called the company and they are shipping me the pump with the proper terminals with a return envelope for the current pump. Not bad customer service. Should be all set now.
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post #14 of 45 Old 02-20-2017, 01:10 PM
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ok is that the entire setup or just the pump because if it is just the pump you will still have the internal pressure filter to sort out Craig

if anything goes wrong check the battery
B1 black and "GOLD"
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post #15 of 45 Old 02-21-2017, 09:40 AM Thread Starter
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Just the pump..What do u suggest to flush that internal filter? I don't want to cut apart the housing.. I was thinking about spraying carb cleaner in one side then the other and taping it against a hard surface to knock out debris.

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