k7 gsxr600 Acceleration problems - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 17 (permalink) Old 05-03-2007, 12:54 PM Thread Starter
 
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k7 gsxr600 Acceleration problems

I just finished modding my new bike, I installed a Two Bros. slip on exhaust, and K&N Air Filter and a power commander with the correct mapping system. Everything was going great until my last oil change, I put a new filter on from suzuki, and switched to synthetic oil. Still 10W40, since the oil change I noticed a wierd top end on my bike. The RPM's were going up as I opened the throttle but no gas was going to the engine, it slowly got worse to the point where I couldnt go over 70 mph at 12000 RPM's in 5th-6th gears. Then it bottomed out to where I couldnt go over 25 mph in any gear. I had to coast it into my driveway and the Power Commander is working properly, the oil level is good and so is the oil pressure. My question is, could this be a spark plug problem? I've put 7200 miles on the bike in 6 months. So i'm just wondering. Any technical help would be greatly appreciated. Thanks.
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post #2 of 17 (permalink) Old 05-03-2007, 09:14 PM
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How many miles were on it when you switched to the sync oil? Even though I highly doubt that is the problem.

Have you check the fuel filter? What about some bad gas? Drain, rinse out with clean gas (NOT WATER), and refill with good clean prem gas. Purhaps run some injector cleaner. I'm betting you have a problem in the fuel system.

Further, have you tried to re-download the map? I have heard of problems with the PCII's loosing their maps. have you tried to remove the PC and run the bike?




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post #3 of 17 (permalink) Old 05-04-2007, 03:38 PM Thread Starter
 
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This is the second time I've used Sync oil. The first being during break-in stage for the first 800 miles. I've disconnected the PC and re-connected it. The Maps are fine. I also noticed the bike moves in gear with a little force applied when the bike is on and off. Perhaps the clutch is done? I'm not sure I don't know much about the clutch. The bike starts fine, and it gets plenty of throttle, the bike just doesn't really go anywhere. It's to the point now where its top end is a sweet 17 mph at 8000 rpms. Also, a little bit off topic.

Has anyone ever swapped Plugs on the new GSXRs? I pulled out the plug holders from the engine and they are DENSO stock, I want to swap them with new ones, but it looks like the plastic casing isnt re-usable. I've inspected it like a son of a bitch and it looks like it's all one piece. Am I going to have to buy the whole thing? the owners manual shows just a plug, but I took them out and it's definitely the plug and the casing it goes in. Thanks for the advice.
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post #4 of 17 (permalink) Old 05-04-2007, 04:13 PM
 
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This is the second time I've used Sync oil. The first being during break-in stage for the first 800 miles. I've disconnected the PC and re-connected it. The Maps are fine. I also noticed the bike moves in gear with a little force applied when the bike is on and off. Perhaps the clutch is done? I'm not sure I don't know much about the clutch. The bike starts fine, and it gets plenty of throttle, the bike just doesn't really go anywhere. It's to the point now where its top end is a sweet 17 mph at 8000 rpms. Also, a little bit off topic.

Has anyone ever swapped Plugs on the new GSXRs? I pulled out the plug holders from the engine and they are DENSO stock, I want to swap them with new ones, but it looks like the plastic casing isnt re-usable. I've inspected it like a son of a bitch and it looks like it's all one piece. Am I going to have to buy the whole thing? the owners manual shows just a plug, but I took them out and it's definitely the plug and the casing it goes in. Thanks for the advice.
did you connect the pc to the lower injectors? not the upper.

Last edited by anyexcus2ride; 05-04-2007 at 04:15 PM.
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post #5 of 17 (permalink) Old 05-04-2007, 04:15 PM
 
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If the pc is not connected to the upper injectors the bike will run poorly
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post #6 of 17 (permalink) Old 05-04-2007, 04:40 PM Thread Starter
 
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They only reach one of them, so it's connected right. Dynojet made it pretty dummy proof. Also what the **** is up with the new Spark Plugs? Why are they all one piece, and how come I can't find them anywhere on the internet.
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post #7 of 17 (permalink) Old 05-04-2007, 08:33 PM
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get the plugs from the parts store and I bet your clutch is done from the sync.

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post #8 of 17 (permalink) Old 05-04-2007, 09:48 PM
 
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get the plugs from the parts store and I bet your clutch is done from the sync.
yep...you didn't mention what kind of synthetic. if you put car synthetic in it, that contains molybdenum which is is an anti-friction material and will burn up a wet clutch fast.

so when you give it gas the rpms go up but the bike doens't go anywhere? if so then that is definately a clutch problem and nothing to do with the motor.
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post #9 of 17 (permalink) Old 05-05-2007, 10:57 AM
 
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bike still under warranty? put the original parts back on and have the dealer check it out. it sounds like either a clutch problem or a messed up spark timing.

synthetic oil at breakin only makes the break in period longer and glazes the cylinder walls. you won't notice a big difference on the streets, but you will notice the difference on the race track.

i doubt if your spark plugs are bad, if they were, you would have a hard time starting the bike.

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post #10 of 17 (permalink) Old 05-05-2007, 04:00 PM Thread Starter
 
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Negative ghostrider. I used Suzuki synthetic motorcycle oil. I swapped the denso plugs with ngk yesterday and it starts better now then it did when I first bought it. However it still moves in gear, sucks but i'm pretty much positive now that it's definitely the clutch. Argh. Only 8000 miles and it's already burnt up. And it's a k7 so yeah the warranty is still in effect. It just sucks b/c the weather since I shipped my bike from Cali to the northeast has sucked, now it's finally nice and I can't ride. Not to mention I want to break-in my new Qualifiers. It makes me sad.
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post #11 of 17 (permalink) Old 05-05-2007, 09:39 PM
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yeah synth oil during break in... not good!!




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post #12 of 17 (permalink) Old 05-10-2007, 11:25 PM
 
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yeah synth oil during break in... not good!!
i don't know why people think that. when i build a motor i put normal oil in it for 20 miles, then synthetic goes in there.

race teams build a motor and their synthetic goes right in. if they do it and build good motors i don't see why i can't.
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post #13 of 17 (permalink) Old 05-11-2007, 02:40 PM
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Yeah well they also rebuild their motors after like 10 races! Can't exactly compare what Jordan's race team does against the street riders!

You need to run regular dino oil cause the added friction over synthetic allows the seals and piston rings to seat properly.

But these types of debates are all and will go on forever!




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post #14 of 17 (permalink) Old 05-12-2007, 12:41 AM
 
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Yeah well they also rebuild their motors after like 10 races! Can't exactly compare what Jordan's race team does against the street riders!

You need to run regular dino oil cause the added friction over synthetic allows the seals and piston rings to seat properly.

But these types of debates are all and will go on forever!

true. i use my race bike practices onto my stunt bikes and daily driven bikes. my 929 had 23k miles on it hard stunted and i ran the synthetic in it early. never had a single problem with it. wiggins did the same and his 929 is at 48k miles and still going.

i do know what you are talking about with the rings seating. you have to have a good crosshatch in the cylinder then get combustion pressures up to cause the rings to expand then seat into the cylinder walls. i haven't had a problem with synthetic doing the job for me. most people baby the motors too much and don't ever get the cylinder pressures up high enough to push the rings hard against the walls causing them to seat.....synthetic or conventional, if you don't break it in right it'll be junk anyways. haha
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post #15 of 17 (permalink) Old 05-12-2007, 04:11 PM
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Like I said... its one of those age old debates...




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post #16 of 17 (permalink) Old 05-12-2007, 10:46 PM
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[QUOTE=BarryP;348934It's to the point now where its top end is a sweet 17 mph at 8000 rpms.[/QUOTE]

Holy crap you must have a sprocket the size of the moon on there, at 8k my bike is pulling at least 35mph.


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post #17 of 17 (permalink) Old 05-12-2007, 10:54 PM Thread Starter
 
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Holy crap you must have a sprocket the size of the moon on there, at 8k my bike is pulling at least 35mph.
God I wish I could roll with you, maybe I could catch you in the turns.
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