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  1. #11
    BitesWhenBitten (OP)
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    Re: Sudden throttle disengage

    I apologize for not replying directly, I'm still getting used to the forum controls.

    Thank you for the leads.

    Sent from my SM-G965U using Tapatalk

  2. #12
    BitesWhenBitten (OP)
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    Re: Sudden throttle disengage

    Saw the kill switch thread, when I can I will disassemble mine to see how bad it is.

    But first, to cycle gear for a brand new helmet.

    Sent from my SM-G965U using Tapatalk

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  4. #13
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Sudden throttle disengage

    Quote Originally Posted by BitesWhenBitten View Post
    How would I check if the cable is turning the bodies?
    Look just under the left side of the fuel tank. You'll see a "disc" with TWO cables attached to it. One on top, one on the bottom.

    One is the PULL (acceleration) cable, the other is a safety RETURN cable.

    That disc, when turned (with the cables) opens and closes the throttle (and engine RPMs). If it doesn't move with the throttle movement, you have a broke cable (not likely)..

    And your correct about the engine stopping when tipped over. There's a "Tip Over Switch" under the RS pod that kills the engine when you tip / fall over.
    Nothing to re-set, just lift the bike up. If your curious, remove the RS pod, there will be a black rectangular unit that has "UP" printed on it...
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

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  6. #14
    Junior Member Gary in NJ's Avatar
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    Re: Sudden throttle disengage

    There's a lot going on in this thread...but I wanted to respond to one topic.

    There are no circumstances where front end wobble is "normal" on an FZ6. If you are experiencing wobble, you have an underlying problem that needs to be solved. Typically wobble is caused by a tire that is under inflated or cupped, worn wheel bearings, loose axle, worn steering head bearings or poorly functioning suspension components (broken spring, low oil, wrong oil, poor damping). In your case, you have made suspension mods, which in and of themselves may be the root cause of instability. When forks are internally lowered (or raised in the triple clamps) the steering geometry (rake & trail) are also changed. At 25 degrees of rake and just 98mm of trail, the FZ6 already has an aggressive steering geometry. If the forks and shock on your bike have not been lowered proportionally you may have introduced a condition whereby the steering geometry is now inherently unstable. If that is the case you will need to install a steering damper.

    I would have the maintenance items noted above inspected and confirmed to be in serviceable condition. If all checks out there, I would review the modifications to the suspension. Do you happen to know what was done to the suspension to lower the bike? Do you know how much travel has been reduced. Please don't tell me that after making suspension changes that the mechanic allowed you to ride off without setting static and race sag.
    Lifelong student of motorcycling. Current bikes: Custom Naked '05 FZ6, LS650 Café Racer, DRZ400 Street Tracker

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  8. #15
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Sudden throttle disengage

    Plus 1 ^^^.

    You SHOULDN'T have any de-cel wobble at all..

    Worn tires and steering head bearings (loose / worn) are the biggest culprits..
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

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  10. #16
    BitesWhenBitten (OP)
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    Re: Sudden throttle disengage

    Quote Originally Posted by TownsendsFJR1300 View Post
    Look just under the left side of the fuel tank. You'll see a "disc" with TWO cables attached to it. One on top, one on the bottom.

    One is the PULL (acceleration) cable, the other is a safety RETURN cable.

    That disc, when turned (with the cables) opens and closes the throttle (and engine RPMs). If it doesn't move with the throttle movement, you have a broke cable (not likely)..

    And your correct about the engine stopping when tipped over. There's a "Tip Over Switch" under the RS pod that kills the engine when you tip / fall over.
    Nothing to re-set, just lift the bike up. If your curious, remove the RS pod, there will be a black rectangular unit that has "UP" printed on it...
    OK, based on everyone's response, I think it is likely I have a grimey kill switch shorting. But I will check this as well.

    Sent from my SM-G965U using Tapatalk

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  12. #17
    BitesWhenBitten (OP)
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    Re: Sudden throttle disengage

    Quote Originally Posted by TownsendsFJR1300 View Post
    Plus 1 ^^^.

    You SHOULDN'T have any de-cel wobble at all..

    Worn tires and steering head bearings (loose / worn) are the biggest culprits..
    I guess I need to look at the bearings, I had a brand new tire put on the bike when I bought it, the old tire had dry rot.
    I normally don't have wobble while decelerating, just a handful of times. Which I guess I hadn't thought about it, but all have been while decelerating, lol.

    Sent from my SM-G965U using Tapatalk

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  14. #18
    BitesWhenBitten (OP)
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    Re: Sudden throttle disengage

    Quote Originally Posted by Gary in NJ View Post
    There's a lot going on in this thread...but I wanted to respond to one topic.

    There are no circumstances where front end wobble is "normal" on an FZ6. If you are experiencing wobble, you have an underlying problem that needs to be solved. Typically wobble is caused by a tire that is under inflated or cupped, worn wheel bearings, loose axle, worn steering head bearings or poorly functioning suspension components (broken spring, low oil, wrong oil, poor damping). In your case, you have made suspension mods, which in and of themselves may be the root cause of instability. When forks are internally lowered (or raised in the triple clamps) the steering geometry (rake & trail) are also changed. At 25 degrees of rake and just 98mm of trail, the FZ6 already has an aggressive steering geometry. If the forks and shock on your bike have not been lowered proportionally you may have introduced a condition whereby the steering geometry is now inherently unstable. If that is the case you will need to install a steering damper.

    I would have the maintenance items noted above inspected and confirmed to be in serviceable condition. If all checks out there, I would review the modifications to the suspension. Do you happen to know what was done to the suspension to lower the bike? Do you know how much travel has been reduced. Please don't tell me that after making suspension changes that the mechanic allowed you to ride off without setting static and race sag.
    Lol, um, maybe?
    It's looking like I won't be taking the bike back to the same mechanic I bought it from.

    We did a lowering kit off Amazon as well as a lowering by the forks. (not sure how to articulate what they did, though I watched. It seemed they loosened the forks in order to push them up)
    If all else turns out well, I'll have them undo the fork lowering.
    I've since regretted having it lowered for a number of reasons, primarily the pain it is to get on center stand first, and I've come to understand in riding other big bikes that I don't really need it anyhow.

    Sent from my SM-G965U using Tapatalk

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  16. #19
    Vrrroooooom! Sudden throttle disengage Motogiro's Avatar
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    Re: Sudden throttle disengage

    Keep in mind that when the bike suspension height is changed you might modify the side stand. This may have been done already. The fact that you have front end wobble is the 1st thing you want to solve before getting back on your bike.

    Dropping the front of the bike even 1/8 inch will increase what is termed "turn in" Too much turn in could result in wobble but as Gary has listed, there are many things that can attribute to that anomaly.
    If you can't fix it by hitting it with a hammer, it's electrical!

    Clif
    SoCal Hoon

  17. #20
    Junior Member Gary in NJ's Avatar
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    Re: Sudden throttle disengage

    Quote Originally Posted by BitesWhenBitten View Post
    Lol, um, maybe?
    It's looking like I won't be taking the bike back to the same mechanic I bought it from.

    We did a lowering kit off Amazon as well as a lowering by the forks. (not sure how to articulate what they did, though I watched. It seemed they loosened the forks in order to push them up)
    If all else turns out well, I'll have them undo the fork lowering.
    I've since regretted having it lowered for a number of reasons, primarily the pain it is to get on center stand first, and I've come to understand in riding other big bikes that I don't really need it anyhow.

    Sent from my SM-G965U using Tapatalk
    I'm not sure what a lowering kit on a the FZ6 would consist of. The FZ6 uses a linkless shock, so there aren't any traditional lowering links (nor should they be used because they change the ratio). Perhaps a shorter spring was installed. Then that begs the question - "what rate"?

    Raising the forks in the triple clamps effectively decrease rake and trail. Rake is the effective steering head angle. On the FZ6 fork angle and steering head angle are one in the same. 25 degrees is already on the "sporty" side of things. As a point of reference, Standard bikes are typically in the range of 25 to 28 degrees, Cruisers are in the range of 30 to 35 degrees, and race bikes are 24-25 degrees. So you can see you really don't want your steering much faster then what Yamaha has already provided. Trail describes the stability of the steering as it relates to the rake. In the range of 100mm (4 inches) is fairly common for a standard and even sport bikes. The FZ6 is 98mm (3.78 inches) so it's once again on the sporty side of things.

    By raising the forks you may have decreased rake (faster steering) and trail (less natural stability). I say "may have" because I don't know what was done to the shock, nor do I (or you) know the sag settings. I guess the point of the post is this; don't change things until you understand the effect of the change. If you don't NEED the suspension lowered (i.e. you can't properly touch the ground) - then don't do it. If you need the suspension lowered, and now you have an unstable steering geometry, than you need to address that through other means, such as a steering damper.

    I would never ride a bike that makes me uncomfortable. Unpredictable handling is #1 on that list.
    Lifelong student of motorcycling. Current bikes: Custom Naked '05 FZ6, LS650 Café Racer, DRZ400 Street Tracker

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