New spark plugs in, now MPG is horse crap - 600RR.net
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post #1 of 13 (permalink) Old 06-25-2008, 11:10 PM Thread Starter
 
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New spark plugs in, now MPG is horse crap

I have a 2004 CBR600rr with 16,800 miles

So to start off, i just got my valves checked. Turned out 1 of the spark plugs wasnt pushed in all the way and was firing abnormally.

Now that im going through my second tank of gas, i have been getting crap MPG. The tank before i got my valves checked and new plugs put in, i was getting an average of 46 mpg.

I use this bike as a commuter and for fun, but the last two tanks has been strictly commuting, cept for revving high through the canyons for about 25 miles immediatly after filling up and i wasnt revving that high at all.

Has anyone ever had this happen to them? Valves checked and new plugs thrown in and the gas mileage goes down?

Should it come back up once the CPU gets used to the new plugs?

Im so confused
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post #2 of 13 (permalink) Old 06-25-2008, 11:19 PM
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were they the factory plugs put back in and were they properly gapped ??

07 600rr pearl white (sold)
07 s2000 232whp white (sold)
05 4runner black (sold )
98 prelude 287whp na (sold)
09 civic si 236whp taffy white (sold)
06 civic si cp black ( current daily )
13 cbr1000rr red (current project )
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post #3 of 13 (permalink) Old 06-25-2008, 11:24 PM Thread Starter
 
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They were NGKs. I dont think they were anything special. Cost like 16 bucks a piece though. They should be properly gapped
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post #4 of 13 (permalink) Old 06-25-2008, 11:35 PM
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i dont understand what you mean by one plug wasnt all the way in .. usually if a plugs not in all the way its either crossthreaded or it will blow out of the engine .. if a plug is not down all the way with the crush ring crushed and some tourqe applied it will work its way out unless its crossthreaded in .. have you owned the bike since it was new ?? could the previous owner possibly have crossthreaded a plug in it .. either way putting new plugs in ( if there the right heat range and properly gapped ) should not cause it to get worse gas mileage .. if you want to try to reset the ecu for $hits and giggles take the ground off for a little while and then put it back on (needs to be off for 10 or 15 mins to make sure all the electrical current is discharged from the ecu ) .. if the mileage is in fact worse id say you need to pull the plugs and chech that the plugs are in fact the ones that belong in the bike and that they are properly gapped aside from that i am at a loss .. changing plugs should not cause this problem ..

07 600rr pearl white (sold)
07 s2000 232whp white (sold)
05 4runner black (sold )
98 prelude 287whp na (sold)
09 civic si 236whp taffy white (sold)
06 civic si cp black ( current daily )
13 cbr1000rr red (current project )
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post #5 of 13 (permalink) Old 06-25-2008, 11:46 PM Thread Starter
 
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Im gonna have to reset the ECU to change my clock at midnight, probably do it this weekend, 1 of my buttons doesnt work so i cant change the clock.

Im hoping its just a confused ECU. Maybe another tank will get it back up. But i had a professional mechanic check the valves and put these babies in.

As far as the loose plug, i guess i worded that wrong, it was still spitting, but it wasnt going all the way or somethign, im still confused about it.
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post #6 of 13 (permalink) Old 06-26-2008, 11:28 PM
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you can pull off the rubber button and change your clock maunally with a small pocket screwdriver or somthing of the sort .. my 03 the damn button fell out all the time .. usually the little white plastic piece will be laying in the bottom of the cluster you can fish it out an put it back in place with a little glue what i did after about 5 times of pulling the rubber off and putting it back .. worked like a charm for a few years after that ..

07 600rr pearl white (sold)
07 s2000 232whp white (sold)
05 4runner black (sold )
98 prelude 287whp na (sold)
09 civic si 236whp taffy white (sold)
06 civic si cp black ( current daily )
13 cbr1000rr red (current project )
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post #7 of 13 (permalink) Old 06-27-2008, 12:01 AM Thread Starter
 
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Im scared that if i pull the rubber off, it wont go back on
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post #8 of 13 (permalink) Old 06-27-2008, 09:49 PM
 
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did you forget to plug a coil back in?

maybe only running on 3 cylinders
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post #9 of 13 (permalink) Old 06-28-2008, 03:51 PM Thread Starter
 
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Well i think i might be retarded. I got 140 on my last tank, well let me rephrase that, i had 140 miles on my tank and the last bar still wasnt blinking. I calculated 42mpgs i think. So maybe im doing good and i had a brain fart due to never having this done to a bike before. I need to :icon_stud more.

What do you think? With that mileage i think im gonna be ok?
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post #10 of 13 (permalink) Old 06-28-2008, 03:57 PM
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yup 42 average is pretty decent :)
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post #11 of 13 (permalink) Old 07-01-2008, 10:04 AM
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42 is normal .. the rubber covers go right back on the cluster easy . have a go at it .. that was the only thing that used to piss me off with my 03 every time i pulled the battery i had to do the pull the cover off the guages ..

07 600rr pearl white (sold)
07 s2000 232whp white (sold)
05 4runner black (sold )
98 prelude 287whp na (sold)
09 civic si 236whp taffy white (sold)
06 civic si cp black ( current daily )
13 cbr1000rr red (current project )
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post #12 of 13 (permalink) Old 07-01-2008, 12:37 PM Thread Starter
 
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So i should just simply pull the rubber cover off? Some people say i need to take the whole unit out, which id rather not do!
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post #13 of 13 (permalink) Old 07-02-2008, 02:24 AM
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the rubber comes off easy .. get a little flathead pocket screwdriver helps to get the rubber back in place and also to push the buttons once the covers off ..

07 600rr pearl white (sold)
07 s2000 232whp white (sold)
05 4runner black (sold )
98 prelude 287whp na (sold)
09 civic si 236whp taffy white (sold)
06 civic si cp black ( current daily )
13 cbr1000rr red (current project )
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