Rapid Acceleration - Yamaha FZ6 Forums - International FZ6 Motorcycle Community Forum

Leo · 07-01-2008, 07:55 AM

Has anyone had the problem of rapid acceleration? I'm a seasoned rider and a couple of times without my doing anything I felt the bike accelerate. Maybe my imagination but was pretty sure it happened. What would cause this? Thanks, Leo

**reiobard** · 07-01-2008, 07:58 AM

i have this problem all the time, then i figured out that i was twisting the throttle all the way!!!

Seriously though, how much is it accelerating without input?

07-01-2008, 08:20 AM

I've never experienced this without having done something to cause it to occur. Could it happen on it's own? Sure but the ECM would have to be getting false input from the TPS or along those lines which in turn would cause an increase in rpm as well as speed.

Fred · 07-01-2008, 08:51 AM

It would have to be an additional source of air to the engine. A vacuum leak downstream of the throttle bodies could cause this. But before you tear the intake apart looking for a sporadic vacuum leak, make sure you're not just twisting the throttle by accident.

Fred

Scott64a · 07-01-2008, 03:54 PM

'Tis a torquey little I-4, you know...

I have to consciously work all the time to remember to keep it cracked open a little so I don't make it go *chunk-chunk* when slowing and going.

Is it racing?
Does it do this when you leave it running in neutral and you're not on it?

Hmmm...

The Yamahas are a little racy, if you know what I mean, and can easily accelerate with minimal twist of the wrist. That's a good thing, but if you haven't been on it a long time, it might just catch you off guard.

Keep it cracked in the turns a little, and that keeps good weight on the rear wheel which gives you more control. It eases the steering too having weight off the front wheel.

DefyInertia · 07-01-2008, 04:05 PM

what year is the bike? bad TPS?

VEGASRIDER · 07-01-2008, 05:44 PM

Make sure your kill switch works if you're one of the riders who always turns the bike off with the keys rather than using the switch. Just in case.

07-01-2008, 09:10 PM

Quote:

Originally Posted by VEGASRIDER

Make sure your kill switch works if you're one of the riders who always turns the bike off with the keys rather than using the switch. Just in case.

I knew there was a reason I have never used the key to turn off bikes. I love that switch...

bmccrary · 07-02-2008, 05:39 PM

Quote:

Originally Posted by DefyInertia

what year is the bike? bad TPS?

+1, you beat me to it. That sounds like what the problem might be. Mine would do something similar as well.

-bryan

**Hellgate** · 07-02-2008, 06:32 PM

Quote:

Originally Posted by Leo

Has anyone had the problem of rapid acceleration? I'm a seasoned rider and a couple of times without my doing anything I felt the bike accelerate. Maybe my imagination but was pretty sure it happened. What would cause this? Thanks, Leo

The last time I had this problem I found myself goign 140 in a 70, the time before I was going 87 in a 60 and got a ticket. My court date is 22JUL08, damn this is going to hurt...

07-01-2008, 07:55 AM	#1 (permalink)
Leo Junior Member Join Date: Jun 2008 Location: Boston area Bike: Yamaha FZ6-S Posts: 2 Rep Power: 0 Member #3581	Rapid Acceleration Has anyone had the problem of rapid acceleration? I'm a seasoned rider and a couple of times without my doing anything I felt the bike accelerate. Maybe my imagination but was pretty sure it happened. What would cause this? Thanks, Leo

07-01-2008, 07:58 AM	#2 (permalink)
reiobard Postaholic Join Date: Nov 2007 Location: Concord, NH Bike: 2007 FZ6 (The Faster Blue) Posts: 5,369 Rep Power: 72 Member #991	Re: Rapid Acceleration i have this problem all the time, then i figured out that i was twisting the throttle all the way!!! Seriously though, how much is it accelerating without input?

07-01-2008, 08:20 AM	#3 (permalink)
HavBlue Guest Posts: n/a Member #	Re: Rapid Acceleration I've never experienced this without having done something to cause it to occur. Could it happen on it's own? Sure but the ECM would have to be getting false input from the TPS or along those lines which in turn would cause an increase in rpm as well as speed.

07-01-2008, 08:51 AM	#4 (permalink)
Fred M em b er e d Join Date: Nov 2007 Location: Austin, TX Bike: See Signature Posts: 887 Rep Power: 26 Member #872	Re: Rapid Acceleration It would have to be an additional source of air to the engine. A vacuum leak downstream of the throttle bodies could cause this. But before you tear the intake apart looking for a sporadic vacuum leak, make sure you're not just twisting the throttle by accident. Fred __________________ I don't know anything about motorcycles, but I just love little kittens. 1990 BMW K75 Turbo (Eternal project bike) 2007 Yamaha FZ6 (Modifications: Stebel Nautilus horn, Valentine 1 hardwired with remote display and audio, Mix-It sound mixer modified for hidden installation, Mayer saddle, true dual high/low headlights. Relay, fuse panel and lockdown blocks for all additional wiring.) Pocketchop. (There are no words to describe it.)

07-01-2008, 03:54 PM	#5 (permalink)
Scott64a Junior Member Join Date: Jun 2008 Location: Lawrenceville, GA Bike: '07 FZ6 Posts: 147 Rep Power: 4 Member #3096	Re: Rapid Acceleration 'Tis a torquey little I-4, you know... I have to consciously work all the time to remember to keep it cracked open a little so I don't make it go chunk-chunk when slowing and going. Is it racing? Does it do this when you leave it running in neutral and you're not on it? Hmmm... The Yamahas are a little racy, if you know what I mean, and can easily accelerate with minimal twist of the wrist. That's a good thing, but if you haven't been on it a long time, it might just catch you off guard. Keep it cracked in the turns a little, and that keeps good weight on the rear wheel which gives you more control. It eases the steering too having weight off the front wheel. __________________ My riding resume: http://www.fz6-forum.com/forum/65603-post56.html

07-01-2008, 04:05 PM	#6 (permalink)
DefyInertia Saratogian Moderator Join Date: Aug 2007 Location: San Francisco, CA Bike: '04 FZ6N - Silver Posts: 1,988 Rep Power: 56 Member #419	Re: Rapid Acceleration what year is the bike? bad TPS? __________________ 2004 FZ6N / KTM 125 SX www.youtube.com/DefyInertia "Y'all Be Safe Out There" - KILLBOY My Rider Resume

07-01-2008, 05:44 PM	#7 (permalink)
VEGASRIDER Dedicated Member Join Date: May 2007 Location: LAS VEGAS NV USA Bike: 2006 Blue FZ6 Posts: 1,689 Rep Power: 35 Member #83	Re: Rapid Acceleration Make sure your kill switch works if you're one of the riders who always turns the bike off with the keys rather than using the switch. Just in case. __________________ *VEGASRIDER...................Member # 35* 2006 Team Yamaha Blue FZ6 VR's Rider Resume

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