L1 600 performance questions again - GSXR.com
 
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post #1 of 10 (permalink) Old 06-09-2019, 04:46 PM Thread Starter
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L1 600 performance questions again

Last fall I posted about getting less power off the line, revving up didn't sound the same, slight backfires when shifting around 7K+, and that my mileage dropped from 45 to 35 mpg.
Over the winter I replaced the dirty air filter, gapped and properly torqued new plugs and put in fresh oil and filter. The bike was stored in my basement and the gas tank had a strong dose of fuel injector cleaner and Stabile in the 90 octane ethanol free gas. This April I got the bike out. First fill up was with the 90 octane ethanol free again. I don't know what the mpg was because my app crapped out. Next fill up i filled with 93 octane with ethanol. At that the next fill up I found the 93 got me 48 mpg! I thought the problem was fixed!! Next fill up I used 90 octane ethanol free again and mileage dropped to 38 mpg, again, about the same as when I complained last fall.
I still feel like the bike is a little loagy below 5,000 especially in third or fourth gear. When I got the bike I could cruise town at 35 in 4th at around 4,000 rpm and the bike was nice and mellow.
I am stumped as what to check.
Bike has a little over 15,000 miles and the only performance mod is that Jardine GP1 slip-on. Any help will be appreciated!
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post #2 of 10 (permalink) Old 06-09-2019, 05:38 PM
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what kind of riding do you do?
is the change in performance at part throttle or full throttle?
if the bike runs fine at WOT, could the o2 sensor be going bad?
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post #3 of 10 (permalink) Old 06-09-2019, 07:43 PM
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Your 90 octane non ethonal fuel how old is it? if fuel has ethonal or not it can get old and stale/flat some of the race fuels you buy ussually high octane does contain lead witch could be a factor with sensors. Was all the 90 octane from the same container ? Someone else mention a 02 sensor possibly failing I guess it’s possible but I would think if that was true with a 02 or any other sensor dirty or failing it would not change much with fuel. I can tell you people call me crazy but In my truck or on my bike I swear I can tell a diffrence in performance and gas mileage station from station even if it’s the same brand fuel one Sunoco station from another Sunoco for instance can have diffrent results. I don’t use a app or keep track on paper so I have no proof that I can show but I do notice it .

Last edited by PaulPhilly; 06-09-2019 at 07:45 PM.
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post #4 of 10 (permalink) Old 06-10-2019, 06:23 AM Thread Starter
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Thanks for the replies. Over half my riding is in town below about 45 mph. It seems to me that when I got the bike last July, stepping up from a Ninja 250, the 600 had more power from a stop, and started deteriorating after a few tank fulls. When I changed plugs I had found that two were barely finger tight and I just unscrewed them by hand. The bike seems to have plenty of pressure coming out of the exhaust, so I font think the cat is clogging up. I do however feel like the exhaust during warmup before I take off smells just a little more like gas? than normal.
Only my first tank had the fuel left over from last year. All gas has been fresh from Citgo. ( Same station each time)
Do I need to check the torque of the plugs again to see if the same two cylinders have loose plugs?
The bike seems to run fine above 6,000 rpms.
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post #5 of 10 (permalink) Old 06-10-2019, 10:57 AM Thread Starter
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It seems really odd to me that I got 49 mpg one tank, wich may have had 120 miles of highway riding at 70-85 mph, and then the very next tank the mileage dropped by 10!! There is no stuttering or F1 light/code popping up.once the bike is warmed up I don't notice the slight lack of power from a stop as I do when the engine was cold. And YES, I realize these bikes are tuned to be running 6,000+ rpms and not idling around at 3-5,000,. But I would swear it had a littler more oomph off the line when I first got it.
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post #6 of 10 (permalink) Old 06-10-2019, 01:55 PM
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Maybe you do have a dirty sensor, dirty tps could do that dirty 02 sensor I can’t think of the name but the 2 sensors that read the outside air .... they make tps cleaner in a can like carb and choke cleaner, pick up a can and remove /clean all your sensors and put it back. Age and miles also can play a role parts and seals and rings wear out it is possible your bike does not run like new bc it’s not new . My k6 has 30k miles and it runs like a bear but it does show it age at times low rpms and warming up etc
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post #7 of 10 (permalink) Old 06-14-2019, 02:05 PM Thread Starter
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So is it worth worrying about why I got 48+ mpg one tank, and 38 the next, or is that common for these bikes depending on what type of riding you do? I don't want to take a chance of damaging the O2 sensor by the exhaust valve taking it out if I don't have to.
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post #8 of 10 (permalink) Old Yesterday, 10:44 AM
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So, you're saying you get better performance, and mileage from the ethanol 93 octane... And less performance, and mileage from the ethanol free 90 octane...

I must be missing something... Use the 93 octane ethanol fuel, and enjoy the summer...

The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
― Hunter S. Thompson
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post #9 of 10 (permalink) Old Yesterday, 12:33 PM
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Quote:
Originally Posted by Spyder13 View Post
So, you're saying you get better performance, and mileage from the ethanol 93 octane... And less performance, and mileage from the ethanol free 90 octane...

I must be missing something... Use the 93 octane ethanol fuel, and enjoy the summer...

I was thinking the same thing. Just to check it out, put the 93 back in a make no other changes. What are your results? Just run the 93. That's all use in everything, even my lawn mower

Teach me brethren, for I am un-learned!
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post #10 of 10 (permalink) Old Yesterday, 01:19 PM
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I don’t have any local gas stations I can find with ethonal free fuel nor can I seem to find any stations with higher than 93 . Sunoco used to have ultra 94 I remember select gas stations having 100-110 octane . Since ethonal free gas is not common any more I wonder if the processing of the ethonal free fuel is not as good quality as your citgo ethonal 93?
Ever since I bought this 1000 I have had the itch to try and find some higher octane fuel. I may try and buy a 5 this summer.
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