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  1. #1
    Isol8er (OP)
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    Lightbulb Front Sprocket Play

    I just bought an 04 FZ6S. 21k miles. I had $1200 worth of work done but I think there's still a problem. There is serious play in the front sprocket. When on the center stand, in first gear, when I move the rear tire back and fourth, there's a ton of play.
    In fact, I can feel the play when I ride. When I let off the throttle, I can feel the play.
    Anyway, before I say "play" one more time. I was thinking it could be the front sprocket? Or is it something else? Worse?
    I don't have another $1200.
    I'm hoping it's a not-so-complicated fix, but I gotta do whatever it takes to keep my baby on the road.
    Anyone have any ideas?

  2. #2
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    Re: Front Sprocket Play

    What exactly is a ton of play? Was there driveline repair or maintenance done? It is normal to have some back and forth slack at the rear wheel, perhaps more in first gear, and the fuel injection is abrupt when opening the throttle from closed. If I suspected something wrong as you described I'd first remove the counter-shaft sprocket cover which you could most likely do with the tools in your toolkit, and do this ASAP! Of course check as best you can that the nut holding the sprocket to the countershaft it secure and tight. If I remember correctly the shaft and the nut should be even at the end of the shaft. With the cover off check again for excessive freeplay now that everything is visible.Can you wobble the sprocket? Next check if the play is in the rear wheel, maybe the cush drive is badly worn though it seems unlikely. If nothing is found, the clutch to mainshaft internally could be the problem, which would be something for a mechanic to investigate.Good luck and check back there is lots of help here.

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  4. #3
    Vrrroooooom! Front Sprocket Play Motogiro's Avatar
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    Re: Front Sprocket Play

    to the forum!

    As Major Tom says the cush drive (Rubber parts behind the sprocket) could even have missing parts.
    As well as the front sprocket check that your chain slack is not too loose. You should have about 1.8 inches of up and down play while on the center stand. Remember to check your chain slack in different spots of the chain by rotating the rear wheel to different spots. This can tell you you've got a worn/stretched chain. Bad sprocket and chain wear could also give you more play than usual.
    If you can't fix it by hitting it with a hammer, it's electrical!

    Clif
    SoCal Hoon

  5. #4
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Front Sprocket Play

    Plus one on Tom's post. Pull that front cover (3 allan heads-and don't pinch the two wires going back together!).

    That year bike had an issue with the sprocket nut coming loose AND FALLING OFF.

    And plus 100, DO NOT RIDE UNTIL the front sprocket nut is inspected.


    Scott

    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(open), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Garmin 590 GPS, 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, Yamaha rear rack with custom aluminum flat rack.

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    Re: Front Sprocket Play

    i have a 2004 FZ6 ,
    front sprocket has just come off , was very lucky this happened as i tried to pull away in traffic , within pushing distance of home and not early when i had been playing on country roads , problem now is it has damaged the threads and the bolt wont stay on

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  9. #6
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Front Sprocket Play

    Quote Originally Posted by Lynn View Post
    i have a 2004 FZ6 ,
    front sprocket has just come off , was very lucky this happened as i tried to pull away in traffic , within pushing distance of home and not early when i had been playing on country roads , problem now is it has damaged the threads and the bolt wont stay on
    Maybe a couple close up pic's?

    They make metric thread "chasers" (kinda looks like a file) that you'll probably be able to use on the THREADED shaft depending on how bad the damage is.

    IE:
    Nicholson Thread Restoring File Set with Pouch (4-Piece)-33024 - The Home Depot



    .

    .
    Last edited by TownsendsFJR1300; 07-16-2017 at 09:29 AM.
    Scott

    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(open), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Garmin 590 GPS, 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, Yamaha rear rack with custom aluminum flat rack.

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  11. #7
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Front Sprocket Play

    Quote Originally Posted by Isol8er View Post
    I just bought an 04 FZ6S. 21k miles. I had $1200 worth of work done but I think there's still a problem. There is serious play in the front sprocket. When on the center stand, in first gear, when I move the rear tire back and fourth, there's a ton of play.
    In fact, I can feel the play when I ride. When I let off the throttle, I can feel the play.
    Anyway, before I say "play" one more time. I was thinking it could be the front sprocket? Or is it something else? Worse?
    I don't have another $1200.
    I'm hoping it's a not-so-complicated fix, but I gotta do whatever it takes to keep my baby on the road.
    Anyone have any ideas?

    Any updates??
    Scott

    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(open), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Garmin 590 GPS, 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, Yamaha rear rack with custom aluminum flat rack.

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  13. #8
    Junior Member SandyN's Avatar
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    Re: Front Sprocket Play

    This is interesting. Remember that the gears are straight cut which also causes a slight rattling sound in the transmission when the motor is running in neutral. This sound disappears when the clutch is disengaged. The point is; there is some play in the transmission which is normal.

    I consider my bike still to be normal (76,000 km). So I have tested the rotation of the rear wheel by marking the tyre on the outer edge while holding a marking pen against the hugger at that point as follows with chain slack at roughly 50 mm up and down. 1st gear: tyre moves 45 mm, 2nd gear: tyre moves 60 mm, third gear: tyre moves 40 mm.

    I have had to re-tighten the front sprocket nut on occasion as it does come loose despite the lock washer still being in place. Perhaps you also need to check the possibility of the front sprocket having being replaced with one that has incorrect splines too.
    Last edited by SandyN; 07-20-2017 at 12:31 AM.

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    Re: Front Sprocket Play

    Quote Originally Posted by SandyN View Post
    This is interesting. Remember that the gears are straight cut which also causes a slight rattling sound in the transmission when the motor is running in neutral. This sound disappears when the clutch is disengaged. The point is; there is some play in the transmission which is normal.
    ...
    Thank you for this info, always wondered about the difference in sound Front Sprocket Play

  16. #10
    Junior Member SandyN's Avatar
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    Re: Front Sprocket Play

    Another source of play which is normal, will be between the engagement dogs on the gears and the recesses which they fit into.

    This is a good pic showing the source of play: https://goo.gl/images/Xq6fQ7 round pins into an oblong hole...

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