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Old 05-12-2011, 08:32 AM   #1
Track_Graphics
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Engine starts missing at 7K RPM - what's up?

I have an 06 CBR600RR with under 8K miles. Once the engine and everything gets heated up (not over HOT. Around 190) and I get up in the 7K RPM range the thing starts missing. Happens in all gears. Freeway in 6th or parking lot in 1st. I changed plugs (gapped to .050), checked fluids and oil, I even replaced the muffler bearings and piston return springs. I'm a painter, not a mechanic or electical guy so I don't think changing the color is gonna help.
Seriously though - it starts to miss and if I hit the kill switch and coast for 3 seconds and restart it - it goes like a bat out of a very hot place again for another 10 minutes. Then starts missing again. I've asked a few people and they all seem to say "plugs" . . . . been there, done that.... not the plugs.
Any clues?
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Old 05-12-2011, 08:39 AM   #2
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Does it have a Power Commander on it?
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Old 05-12-2011, 08:41 AM   #3
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Quote:
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Does it have a Power Commander on it?
My first question as well.
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Old 05-12-2011, 09:24 AM   #4
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power commander...
if you already have it.. does it have the right map for your setup?

another would be.. some seal is expanding at a certain temp.. and it's letting oil into your plugs.. which is misfiring because it is wet. But that's a car perspective.
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Old 05-12-2011, 09:45 AM   #5
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my guesses would be power commander or gas
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Old 05-12-2011, 09:48 AM   #6
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.050 is a bit large on the gap? Not sure what is recommended but might verify that.
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Old 05-12-2011, 10:21 AM   #7
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Seems like it would be closer to .030
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Old 05-12-2011, 10:26 AM   #8
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That was my first thought. .050 is a lot. My bike runs .030
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Old 05-12-2011, 11:47 AM   #9
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Old 05-12-2011, 11:55 AM   #10
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No power commander. It's just a stock bike. I WAS gonna burn it but that was yesterday. I run 93 from Texaco most of the time, but gas doesn't seem to matter. It did this even before I changed out the plugs - which were almost gone. I can ride about 30 miles with no problems and then it starts having it's little fit.
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Old 05-12-2011, 12:07 PM   #11
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Check the tank vent, or when it acts up, pop the cap open and see if it goes whhoooooshh

Altho it sounds more like weak spark.
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Old 05-12-2011, 12:13 PM   #12
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Quote:
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Check the tank vent, or when it acts up, pop the cap open and see if it goes whhoooooshh

Altho it sounds more like weak spark.
That reminds me. I helped fix a Tl1000r that someone siliconed the fuel pump back in it. The silicone ended up all gummed up in the fuel pump sock. Did the same kinda stuff.
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Old 05-12-2011, 12:14 PM   #13
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I cant see the spark issue popping up after 30 mins. Try running some Berryman chem tool or Seafoam in the fuel and see if it clears up.
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Old 05-12-2011, 12:18 PM   #14
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I was thinking a fuel pump issue, but the vent thing makes sense also - here's why - Also, if I stop along the way and fill up it seems to run great again for another 30 miles or so - SO - weak pump?(a full tank gives a bit more pressure) clogged vent?
And yeah - the seafoam might be a good idea in any case. Never used it, but I've hear of it before.
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Old 05-12-2011, 12:20 PM   #15
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The full tank doesnt matter one bit when you consider the discharge pressure of the pump. You may raise the tank and check for a kinked hose.
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Old 05-12-2011, 12:22 PM   #16
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CHeck with bubby or candie, they had some issue with their CBR losing power, it took a while to fiure out, i think that it end up being a sensor underneath the seat or something like that.
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Old 05-12-2011, 12:36 PM   #17
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Ok I will tell you what is wrong with it since you will not burn it ..................
Here is your problem it's a dang Honda !!!!! lol
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Old 05-12-2011, 01:14 PM   #18
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It's not a HONDA - - it's a CBR . . . . .


duh...


No kinked hose - already checked that one. I WILL try the re-gap to .030. A tread I was reading about a month ago was saying something about .065 . . . I thought that was WAY off.
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Old 05-12-2011, 01:25 PM   #19
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Try looking up the actual spec. on the gap.
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Old 05-12-2011, 01:50 PM   #20
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Where are you located? And as stated before I would check the specs on the gap. I would NEVER just gap it to whatever random person on the net said I should. Oh and I asked where you were located to see if you wanted to bring it by and well take a look at it.
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