'06 ZX6R 636 has no low end torque

5242 Views 6 Replies 2 Participants Last post by ZX6R-636Rider, Sep 17, 2014

ZX6R-636Rider

Discussion Starter · Aug 11, 2014 (Edited)

I swapped the stock exhaust on my bike for a Yoshimura RS-5 slip on and it went well for a couple days but then the FI light came on and I have yet to be able to get it to go off. These 636s should have no problem getting that front wheel off the ground, it should have the opposite problem...staying on the ground, but I can't even force mine up now. Since then I have also replaced the plugs with NGK iridium and the stock air filter with a BMC "Race" air filter (I prefer those over K&N, and Yoshimura endorses them as well. Does anyone know how I can get that light to go off and make her run right? Past 5-6K RPMs she'll open on up and sounds amazing and I get power back, but there is no bottom end whatsoever. My guess is I'm gonna have to remap the ECU via a Power Commander or Two Brothers Juice Box or something of that nature, or just take out the Servo completely and replace it with a Servo Buddy (this is by far the cheaper of my two options) Any other suggestions or ideas are very much welcomed, thanks in advance

Save

1 - 3 of 7 Posts

byte2022

· #2 · Aug 12, 2014

ZX6R-636Rider said:
I swapped the stock exhaust on my bike for a Yoshimura RS-5 slip on and it went well for a couple days but then the FI light came on and I have yet to be able to get it to go off. These 636s should have no problem getting that front wheel off the ground, it should have the opposite problem...staying on the ground, but I can't even force mine up now. Since then I have also replaced the plugs with NGK iridium and the stock air filter with a BMC "Race" air filter (I prefer those over K&N, and Yoshimura endorses them as well. Does anyone know how I can get that light to go off and make her run right? Past 5-6K RPMs she'll open on up and sounds amazing and I get power back, but there is no bottom end whatsoever. My guess is I'm gonna have to remap the ECU via a Power Commander or Two Brothers Juice Box or something of that nature, or just take out the Servo completely and replace it with a Servo Buddy (this is by far the cheaper of my two options) Any other suggestions or ideas are very much welcomed, thanks in advance

. To get the fi light off you have 2 options. You either buy a servo buddy or flash the ecu and have the map changed to fit the modifications as well as all other unlock able items unlocked. This requires a Dyno run before as is more expensive but can save you a power commander purchase if the ecu flash is done by someone with the Dyno and the flash capability and that they know what they are doing. In the long run it's the best option but I have a flashed ecu and a power commander because that's the cheaper option when your changing things on the bike a lot Hope this helps

twisted throttles brings me smiles

Save

byte2022

· #3 · Aug 12, 2014

ZX6R-636Rider said:
I swapped the stock exhaust on my bike for a Yoshimura RS-5 slip on and it went well for a couple days but then the FI light came on and I have yet to be able to get it to go off. These 636s should have no problem getting that front wheel off the ground, it should have the opposite problem...staying on the ground, but I can't even force mine up now. Since then I have also replaced the plugs with NGK iridium and the stock air filter with a BMC "Race" air filter (I prefer those over K&N, and Yoshimura endorses them as well. Does anyone know how I can get that light to go off and make her run right? Past 5-6K RPMs she'll open on up and sounds amazing and I get power back, but there is no bottom end whatsoever. My guess is I'm gonna have to remap the ECU via a Power Commander or Two Brothers Juice Box or something of that nature, or just take out the Servo completely and replace it with a Servo Buddy (this is by far the cheaper of my two options) Any other suggestions or ideas are very much welcomed, thanks in advance

. And as far the bottom end. You lost more putting on that exhaust because it has removed the back pressure from the engine meaning less bottom more top. Ecu flash and power commander will help but won't solve it completely. That's another reason I went with two brothers and added the p2 power tip insert.

twisted throttles brings me smiles

Save

byte2022

· #6 · Aug 15, 2014

ZX6R-636Rider said:
This is my first street bike but I've raced MX all my life so I can ride...but I wasn't paying attention to the road (I didn't realize what light was blinking on the gauge...turned out to be my turn signal) but this was only the third day I had it so I didn't know. Anyways I went off the road going about 30mph and laid it down. A friend of mine's step-dad has a shop near where I live and I took my friends word that he could fix everything for me and I've had nothing but trouble out of it since I let that man touch it. But by reading forums like this and other things on the internet I'm working on it myself now, I downloaded a pdf copy of the Kawasaki owners manual and it has basically told me everything I need to know other than that exhaust problem. I took the Yoshi off for about a week and it didn't run any better without it on bottom end than with it so I put it back on because it does give you top end and I spent money on it and wasn't gonna let it go to waste, plus it looks a hell of a lot better and is about 25lbs lighter without the stock exhaust and turn signals

okay so hear it goes the exhaust had a valve in it which is operated by two cables which are attached to the motor. The ignition turns on the exhaust servo and causes it to make a noise and the gear may move may not. What happened is it is supposed to feel resistance to know where to open. When you take the stock exhaust off it can't do that causing a code or in your case a light to come on. This is common across all brands you can make a servo buddy yourself for less than 10.00 usd if you search online for the mock up. Usually a few resistors and a capacitor configured together. And as far as you being a mx rider and you knowing how to ride. We aren't here to judge you but racing mx all your life doesn't make you a good rider on the street. May give you a slight advantage on some but I ride mx,street, and track and each have a big impact on my riding but individually don't make me a good rider. Most here have crashed before. I've crashed at 15 mph, 65-75mph, and 160mph and the worst by far was 15mph. If you learned anything it should be that you have a lot to learn about bikes. And just because you can ride mx doesn't translate to you being above a step offer a rookie. We all start at some point but don't let over confidence be what leads to your death. Learn the bike. Learn to feel the way it grabs a curve verses grabbing a rut. Learn how to shift body weight as you did on the dirt bike, learn about proper body position as it's nothing like mx with shifted weight pointed elbows consistent throttle control and controlled braking. Once you get those you'll be a much better rider. You'll enjoy it better and be safer on the road. Glad your ok though. And definitely do as much work as you can. Great way to learn your bike

twisted throttles brings me smiles

See less See more

Save

1 - 3 of 7 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month