loss of power doing wheelies - 600RR.net
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post #1 of 22 (permalink) Old 09-24-2008, 04:19 PM Thread Starter
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loss of power doing wheelies

I am having an issue with losing power when doing wheelies. Every time i pick up the front end it seems to lose power after about 4 seconds and i cant keep the front end up. i have no idea whats wrong. i have an 03 rr with a two brothers slip on and it doesnt have a pcIII. I bought it that way. it has about 10k on the motor.

any thoughts?
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post #2 of 22 (permalink) Old 09-24-2008, 04:41 PM
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Learn how to do wheelies and stop blaming it on the bike! I'm just joking. How much fuel do you have in the bike? It would take a few seconds for fuel pressure to drop if the fuel wasn't at the intake of the fuel pump. I'm just speaking from what I know mechanically of the bike, I've never had that problem.

Try filling up the tank and trying again. With fuel injection, angle of the bike shouldn't matter, the only idea I have is starving the fuel pump.

I would always recommend a PC3 and a custom map with any exhaust mods. That's why I still have stock exhaust.

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post #3 of 22 (permalink) Old 09-25-2008, 01:26 AM Thread Starter
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it does that at any level of fuel. also many times it takes everything i got clutch and all to get the front end up and then next day it seems to snap up no problem. its just really inconsistent. would a pciii solve this problem? i guess there is not really a way to tell with out a dyno.

thanks for the input
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post #4 of 22 (permalink) Old 09-25-2008, 02:51 AM
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I have no solutions to offer. But I CAN tell you that my friend's 03 is the exact same way. He thought it was his technique keeping him from doing them. So I hopped on it, and sure as hell, I couldn't get it to stand up at all. A few times, it stood right up. But most times I could clutch that thing like crazy and nothing. It would lift a few inches off the ground, then it would almost felt like the suspension was literally pulling it back down. I couldn't understand it at all. He also had a slip-on exhaust and a PCIII.


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post #5 of 22 (permalink) Old 09-25-2008, 03:19 PM Thread Starter
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thats my problem! anyone else? advice?
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post #6 of 22 (permalink) Old 09-25-2008, 10:17 PM
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A slip on w/o a PC would run the same all the time. If it is bad, it's always bad. I've had my bike noticably loose power when I'm in the mountains at a high altitude but other than that, it's pretty consistant.

If you're sure that the drive train is ok, (clutch slipping or chain skipping teeth) Then it has to be fuel delivery. How does the bike run on 2 wheels?

Don't do this if you're not comfortable but, body position sitting up as straight as you can and arms extended. 1st gear full throttle. On all of my 600rr's about 9-10k the front would come up at these rpms. start at like 10mph which is like 3k rpm. Roll on it and go, when the front comes up, what happens? does it start to lose power? Does it even have enough power to come up? In 1st gear, 50 hp is probably enough to clutch the front off the ground.

My guess with what I know, Clutch slipping... Fuel pump putting out low pressure. Last maybe a wire that is coming disconnected with the extra forces of wheeling or full throttle force.

Just because the clutch lever has some play doesn't mean that your clutch is not slipping. I've learned what a slipping clutch feels like from dirt bikes, I've never had one slip on the street so I can't tell you what it feels like. I assume the same but different. (how do you explain that?)

Fuel pressure, unless you have the right tools, a shop will have to do that.

A wire, I highly doubt that but I guess it is a possibility. I think you're more likely to win the lottery than to have a wire thas disconnects only on one tire.

If you want to know how I'd check my clutch, let me know I'm not going to type for 5 more min if I don't have to. Anyway, Hope this helps.

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post #7 of 22 (permalink) Old 09-26-2008, 11:02 AM Thread Starter
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if i roll it on in 1st i still have to bounce it a little to bring it up. sometimes it comes up easier than others just like in 2nd. dont get me wrong it comes up but not by just rolling on the throttle.

the bike does feel fast though. when i get up high on the tach it feels blinding fast but not till im around 9k. if you have time to tell me how to check my clutch id appreciate it.
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post #8 of 22 (permalink) Old 09-26-2008, 12:10 PM
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It's possible the rear shock is mangled and behaving oddly - these things were built to stay nose down - try full rear preload and compression damping then the opposite and see if it behaves one way or the other, might just be the rear suspension giving you crap
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post #9 of 22 (permalink) Old 09-26-2008, 12:27 PM Thread Starter
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never thought about that. ill try it

thanks
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post #10 of 22 (permalink) Old 09-26-2008, 05:44 PM
 
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if the clutch is slipping the rpms will shoot up when it loses power.

the easiest way to see if your clutch is slipping is get rolling in 2nd or so gear.
run it to about 10K, roll off and then hammer it again.
if the clutch is worn your tach will redline but you wont go any faster


have you considered that it is oil starvation from the wheelie.
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post #11 of 22 (permalink) Old 09-26-2008, 06:54 PM
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more throttle ha
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post #12 of 22 (permalink) Old 09-26-2008, 09:02 PM Thread Starter
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its definitely not the clutch. i havent tried the shock adjustment. it seems really stiff though.
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post #13 of 22 (permalink) Old 09-26-2008, 10:50 PM
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how high would you say the front tire is before it falls back down?

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post #14 of 22 (permalink) Old 09-27-2008, 12:22 PM Thread Starter
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on a good day all the way up. ill be riding and then after about 4-5 seconds even when the rpms are still around 11-12k it will just come down. but thats on a good day. sometimes it will hardly come up at all.

that is in 2nd gear of course.

it seems like good and bad days are depending on how good the gas is. depending on where i got it.
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post #15 of 22 (permalink) Old 09-28-2008, 02:16 AM
 
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I could clutch up wheelies in 2nd/3rd on my 05 R6 no problem. Switched to my 600rr, and its a no go. The ergo on this bike is made to keep the front planted. Also, the bike weighs more, and has more weight up front.
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post #16 of 22 (permalink) Old 09-28-2008, 02:17 AM
 
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Also, you gotta remember these bikes were made for the track. Aka not for doing wheelies.
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post #17 of 22 (permalink) Old 09-30-2008, 12:17 PM
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ahhh here comes the link - if it seems to follow where you buy the gas guess what - you are getting bad fuel once in a while - not the first time I've seen that one on the boards, try driving for a bit on BP/Citgo/(insert major gas market vendor here) 93 octane - say a month - and see if the problem just magically disappears....
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post #18 of 22 (permalink) Old 09-30-2008, 03:29 PM Thread Starter
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i run chevron and texaco 93 almost everytime and get different results. texaco is supposed to be good fuel from what i hear. i wonder if there is a good gas additive that would help.
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post #19 of 22 (permalink) Old 10-01-2008, 12:34 AM
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Were you standing it up past the balance point? Someone told me that the BAS (tip sencor) will shut off the fuel pump if it pulls back to far?
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post #20 of 22 (permalink) Old 10-01-2008, 12:48 AM Thread Starter
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yeah most of the time. that is when i feel it the most. when it comes up really smooth and i get a good ride going is when i feel the power just shut off. its not like the engine shuts down its just the power backs of about 20-30%. ill try and research that.

thanks
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post #21 of 22 (permalink) Old 10-01-2008, 08:52 AM
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Couldn't be oil starvation at that angle. Naah. Couldn't be.
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post #22 of 22 (permalink) Old 10-01-2008, 03:21 PM
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Quote:
Originally Posted by Shinigami View Post
Couldn't be oil starvation at that angle. Naah. Couldn't be.
it's not oil starvation... He said it only comes up a few inches, not to BP. My friends bike had this same problem and it felt to me like it was suspension related. It would come up in second, but then feel like it was being pulled down. It would come up in first, but you still had to fight it.

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