600rr only 90 mpg?? - 600RR.net
Exhaust & Fuel Delivery Tips on how to get the most out of your bike

 
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post #1 of 28 (permalink) Old 03-13-2015, 11:30 AM Thread Starter
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600rr only 90 mpg??

Bike Info:
2006 cbr600rr 23k miles
BMC Race Filter
Two Bros slip on
Castrol Part Synthetic 5w40 oil
Chevron 93 Octane gas (have tried other gas stations to rule out bad gas)

Rider Info:
6'1"
200 lbs

Previous owner had the 15K service done. So I got a used cbr600rr. Rode it around last season and constantly got only 90 to 100 mpg out of her. When I park in the garage it starts to smell like gas after an hour. I looked around and no gas present on any floor or parts around tank or plastics.

UPDATE: I took apart the airbox to see the filter and it was dirty, so ordered a new one. Also cleaned out the airbox as oil residue was present from the pair system. No gas present but will prime the fuel line today and see if gas does come out from the lines or injectors seals.

I finally took all the plastics off yesterday as my radiator sprung a leak and well previous owner used JBweld rather than having it aluminium welded, so now I need to get a new radiator but when I have the bike apart are there things other than gas lines that I should look at?

Last edited by Deenutz; 03-16-2015 at 11:39 AM.
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post #2 of 28 (permalink) Old 03-13-2015, 11:38 AM
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90-100 mpg!? Sh!t man, you must be running on a single cylinder...

I'll assume you mean 90-100 miles out of a tank... Besides checking the fuel lines, check tire pressures, chain slack and condition. Those will have an impact on your mileage. If you smell gas, it's coming out of somewhere. In which case it shouldn't be hard to track down. Just saw a thread a little ago where the fuel was coming out of the fuel rail.

Here it is: https://www.600rr.net/vb/showthread.p...05#post7201105
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post #3 of 28 (permalink) Old 03-13-2015, 11:39 AM
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I'm assuming you're starting with a full tank of gas and doing an average of 55-65mph? Are you tracking your miles? Does the 06 have a gas gauge?

I agree the amount seems low, it should be around the 200 mile range. 5 gallons at 45 mpg = 225 miles.

I would check the tank for leaks, but you said you don't see anything. Lift it up and make sure everything looks correct.

Also just replace the radiator, not worth trying to fix it. It would just give you more problems down the road.
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post #4 of 28 (permalink) Old 03-13-2015, 12:10 PM Thread Starter
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Yes 90 to 100 miles out of the tank. I usually fill up when the bars flash and put in about 3.7 to 3.9 gallons. I am assuming that it may be leaking somewhere under the tank but I just cant fathom that I have not gotten a fire or drops of gas anywhere. Chain is tightening up to have 1in in slack and tires are at 34psi.
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post #5 of 28 (permalink) Old 03-13-2015, 12:25 PM
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On my 600rr I was getting about 42-45 mpg.. I can go 120 miles and have 3 bars left on the gauge...my bike has 40k miles on it... What is your riding style? Hard on the gas, fast every where you etc...that can play a factor as well.


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post #6 of 28 (permalink) Old 03-13-2015, 12:31 PM
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Quote:
Originally Posted by Deenutz View Post
Yes 90 to 100 miles out of the tank. I usually fill up when the bars flash and put in about 3.7 to 3.9 gallons. I am assuming that it may be leaking somewhere under the tank but I just cant fathom that I have not gotten a fire or drops of gas anywhere. Chain is tightening up to have 1in in slack and tires are at 34psi.
Hopefully someone can chime in if I'm wrong but aren't the tire pressure supposed to be 36 front and 42 rear?
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post #7 of 28 (permalink) Old 03-13-2015, 12:33 PM
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Wut 200 miles range?!?!?!, I can just get 130 miles max out of one tank, I thought that was normal? I do ride highways a lot though at 75mph.
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post #8 of 28 (permalink) Old 03-13-2015, 01:23 PM
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Ya I'm getting about 120 per tank on my 03, 34k miles. I wouldn't say I'm heavy handed with the throttle, but when an open stretch of road starts calling my name...well
I believe I run rich too. Just an air filter, slip-on, and PC3 with a map from their website (not a custom tune).

5'11'' 145 lbs no gear.

Things to maintain for better MPG: chain lube and tension, clean air filter, tire pressures, change oil every 3k. Maybe try adding seafoam to your next couple tanks. It always seems to give me a boost in MPG in the tank that I added it to, and then tapers off in the subsequent tanks. Maybe consider replacing your fuel filter?
I'm sure there are more things to maintain but that is what I start evaluating first when MPG starts to suffer. 07+ bikes get better MPG as well, if you were comparing MPG difference between model years.

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Last edited by G Money; 03-13-2015 at 01:30 PM.
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post #9 of 28 (permalink) Old 03-13-2015, 02:54 PM
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Correct Loyha on the psi. I run 40 rear/35 front for everyday riding and adjust accordingly for the really twisty stuff like the dragon or blood mountain.

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post #10 of 28 (permalink) Old 03-13-2015, 05:58 PM Thread Starter
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I mainly do spiritied runs with a good 50 miles on hwy going about 75mph and rest is twisties in high rpms. But most everyone else seems to still have a full bar to 2 bars and my bike starts flashing the low fuel sign. But I am pretty sure I dont have a fuel filter, it's just a screen inside the fuel pump and it's clean. I also have a non Cali spec model so I don't have any of the emissions things. So I don't have any servo, or 02 sensor on my bike.

Last edited by Deenutz; 03-13-2015 at 06:02 PM.
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post #11 of 28 (permalink) Old 03-13-2015, 06:26 PM
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Maybe it's running really rich? I'm not familiar with non-Cali bikes, but I would assume you should have an O2 sensor. Not having an O2 would cause the bike to go into limp mode and just dump fuel into the cylinders?

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post #12 of 28 (permalink) Old 03-13-2015, 06:36 PM
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Double post.

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post #13 of 28 (permalink) Old 03-13-2015, 11:12 PM
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AFIK no US Spec CBR 07+ has O2 sensor....

? could you have a slightly crumpled tank? 90 miles to flash mode seems slightly low.....

I am down to 2-3 bars at 105 miles on a brimmed tank on my 09.

at 120 miles or so, go into flash mode...

about 32 mpg.....spirited riding averaging about 75mph.

Last edited by tary preisser; 03-13-2015 at 11:20 PM. Reason: +info
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post #14 of 28 (permalink) Old 03-14-2015, 04:31 AM
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The fuel bars on the dash aren't proportional. The top bar alone is half the tank...

2009 cbr 600rr
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post #15 of 28 (permalink) Old 03-14-2015, 09:06 AM
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Do you have a Power Commander on the bike? Your symptoms and descriptions are sounding like a bike that's running rich. However if you are riding high revs a lot, that's not THAT far off of mileage.

If you do have a PC it may be malfunctioning or the map is either bad or corrupt. If you don't yoyr bike is running rich. I'd start doing sort of typical maintenance things like plugs, filters, etc. You should have a fuel filter in the tank but you have to remove the pump to get to it (I think, maybe not on the earlier gen), and personally I'm not a fan of aftermarket air filters so I'd suggest stock there too. I'd also look to see if your bije has an 02 sensor and see how bunked up that is or if it's been disconnected. People do weird things in the name of "performance" that has no effect other than bad so I'd look around.

Service manual should have a section on things to check if you're running rich, follow that as well.

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post #16 of 28 (permalink) Old 03-16-2015, 11:35 AM Thread Starter
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Well we will see what will happen. I do not have a 02 I checked today all over the pipes and the only things I have are what is listed above in first post for mods.

I have ordered a new filter, plugs looked to be in good condition. I am removing the lower airbox triangles and also replacing the filter with a new BMC Race. Hoping I can maybe lean out the bike by introducing more air as it does seem to run rich as I get little hotter temps and always smell like exhaust when I get home from a run.
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post #17 of 28 (permalink) Old 03-24-2015, 01:17 AM
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Try riding in a higher gear. I'm usually getting 120 miles out of a tank before the bar starts flashing, but I'm usually putting around at 3k - 4k rpm unless on the freeway.

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post #18 of 28 (permalink) Old 03-26-2015, 11:40 AM Thread Starter
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So no leaks on any connections or lines. Seems like the smell is coming from one of the 2 hoses that dump to the ground by the kick stand. I think this is the breather hose for the tank and the other is the fresh air supply? One of these gives off a heavy gas smell. Any idea as to why or if this is normal?

Also I am thinking my gas gauge may be off as every time it starts to flash I only put in around 3.5 to 3.7 gallons. And if we have a 5 gallon tank than there is my issue.

Is there a fuel level sensor inside the tank? I know there is a float but I am thinking maybe the sensor is bad?
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post #19 of 28 (permalink) Old 03-26-2015, 11:50 AM
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Is it possible that you had your tank breather hose pinched at one time and vacuumed the sides of your tank in, effectively reducing its maximum capacity? That hose is easy to pinch, and it will cause a vacuum strong enough to suck the sides of your metal tank in.

One of your hoses is going to smell strongly of gas. That's what it is for.

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post #20 of 28 (permalink) Old 04-02-2015, 06:50 AM
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with my mods and living in the mountains and a little hard riding, i average 150 miles to the tank.
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post #21 of 28 (permalink) Old 04-02-2015, 09:03 AM
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I average 6.2L/100km (37MPG). All I have is a slip on and -1/+2 setup. Do about 30km/day @ 100mk/h (62mph) on the highway.

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post #22 of 28 (permalink) Old 04-06-2015, 10:41 PM
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Quote:
Originally Posted by harry-nyc View Post
I'm assuming you're starting with a full tank of gas and doing an average of 55-65mph? Are you tracking your miles? Does the 06 have a gas gauge?

I agree the amount seems low, it should be around the 200 mile range. 5 gallons at 45 mpg = 225 miles.

I would check the tank for leaks, but you said you don't see anything. Lift it up and make sure everything looks correct.

Also just replace the radiator, not worth trying to fix it. It would just give you more problems down the road.
05/06 has gas gauge (I believe even 03/04's do too).

200+miles per tank is not average, unless you ride super conservative. Most people get between 120-150 per tank. Most I've ever gotten is 170/tank on an all highway ride.

MPG highly depends on your riding style, unless there is something wrong with the bike.


Quote:
Originally Posted by Deenutz View Post
Yes 90 to 100 miles out of the tank. I usually fill up when the bars flash and put in about 3.7 to 3.9 gallons. I am assuming that it may be leaking somewhere under the tank but I just cant fathom that I have not gotten a fire or drops of gas anywhere. Chain is tightening up to have 1in in slack and tires are at 34psi.
IIRC the tank is 4.8gallons (someone correct me if I'm wrong).

when the gauge starts to flash, you should have around .9 gallons left. So you are about right; when your gauge flashes and you are only able to put in 3.9gal (3.9 + 0.9 = 4.8gal).

If you rode your bike all the way til empty you could theoreticall get around 120gal/tank.

How aggressively do you ride, and what is your normal riding style?

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post #23 of 28 (permalink) Old 04-07-2015, 09:48 PM
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Interestingly i found the cbr600 and cbr1k to have similiar fuel range. Both getting approx 250kms(150mils) before filling in 17L(4.4Gal) of fuel. Both measured stock, mostly freeway riding.
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post #24 of 28 (permalink) Old 04-07-2015, 10:49 PM
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Have you looked at the gearing? Being used you can't assume stock gearing and that is a game changer. Also if it isn't stock and there is now speedohealer you could be getting false milage readings.
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post #25 of 28 (permalink) Old 04-07-2015, 11:04 PM
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I've been trying to keep the throttle under control to really get a good average mpg...i still get ~34 without trying and regardless if i throw 89 or 93 octane in it.

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post #26 of 28 (permalink) Old 04-10-2015, 01:53 AM
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I've been trying to keep the throttle under control to really get a good average mpg...i still get ~34 without trying and regardless if i throw 89 or 93 octane in it.
I would stick with Premium/93 gas if I were you.

Sure it may run fine with 89, but I always recommend following the Manufacturer's recommendation (Same for cars and bikes). You may be saving a few cents, but its not worth it to me. And you fill up 4gallons man, don't be cheap!

There's a reason that high-performance engines require high-octane gas.

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post #27 of 28 (permalink) Old 04-10-2015, 02:00 AM
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Yea I recently went through the manual for something and noticed it says minimum 91 octane anyway.

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post #28 of 28 (permalink) Old 04-10-2015, 07:43 PM
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with my mods and 91 oct. (max here in cali) i get about 150 miles on a tank full.
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