Author 17 Tooth Front Sprocket  (Read 6755 times)

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  • Offline qwerty   it

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      #120

    Offline qwerty

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    Re: 17 Tooth Front Sprocket
    Reply #120 on: Sep 18, 2022, 05.46 pm
    Sep 18, 2022, 05.46 pm
    But isn't a crown 50 or better 49?

  • Offline Bansheeboy18   us

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      #121

    Offline Bansheeboy18

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    Re: 17 Tooth Front Sprocket
    Reply #121 on: Sep 22, 2022, 01.22 am
    Sep 22, 2022, 01.22 am
    *Originally Posted by qwerty [+]
    But isn't a crown 50 or better 49?

    A general rule of thumb is that 1 tooth increase or decrease on the front sprocket is equal to 3 on the rear.
    Last Edit: Sep 22, 2022, 01.23 am by Bansheeboy18

  • Offline Applebum1001   us

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      #122

    Offline Applebum1001

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    Re: 17 Tooth Front Sprocket
    Reply #122 on: Sep 22, 2022, 04.47 pm
    Sep 22, 2022, 04.47 pm
    Thanks for this post. I've been thinking of doing the same and getting mixed options. I too feel the engine is working to hard in 6th gear but am told that the 660 is a high reving motor and this is its sweet spot. That being said it feels like I could use another gear on the top end. I did contact Triumph and this mod will void the engine Warrenty. Glad to see it doesn't affect the speedo. Triumph does suggest changing the chain as well. My bike only has 1600 miles on it. Wondering if this will be necessary. did you put a new rear sprocket and chain on as well since you were changing the front sprocket?

  • Offline Applebum1001   us

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      #123

    Offline Applebum1001

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    Re: 17 Tooth Front Sprocket
    Reply #123 on: Sep 22, 2022, 06.01 pm
    Sep 22, 2022, 06.01 pm
    *Originally Posted by Applebum1001 [+]
    Thanks for this post. I've been thinking of doing the same and getting mixed options. I too feel the engine is working to hard in 6th gear but am told that the 660 is a high reving motor and this is its sweet spot. That being said it feels like I could use another gear on the top end. I did contact Triumph and this mod will void the engine Warrenty. Glad to see it doesn't affect the speedo. My bike has 1600 miles. Changing the chain along with the front sprocket. Leaving the rear sprocket alone.

    JT completely out of stock. Here's an alternative...https://sprocketcenter.com/i-30497794-superlite-27502r-520-pitch-chromoly-steel-front-sprocket.html



  • Offline fred_jb   gb

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      #124

    Offline fred_jb

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    Re: 17 Tooth Front Sprocket
    Reply #124 on: Sep 22, 2022, 06.28 pm
    Sep 22, 2022, 06.28 pm
    I can't see any justification for Triumph saying that this will void the engine warranty. The engine and gearbox is designed to work across a wide range of road speed and engine rev combinations, and the flat torque curve facilitates this. All this may do is slightly shift the typical gear change points, and I'm sure that has much less effect than the variation between riders in which gear they would select for similar riding situations. In other words that seems like nonsense!

    If anything this mod gives the engine an easier time in high gears and at high speed, without any noticeable adverse affect on top gear roll on acceleration, while at the bottom end the change is not enough to cause the engine to struggle in the lower gears. On a recent trip I still found it fine to go around small traffic islands in second gear without lugging the engine, and always had the option to change down to 1st if required, and there is absolutely no situation where 1st gear is now to highly geared, as it was far too low originally.


  • Offline Applebum1001   us

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      #125

    Offline Applebum1001

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  • Offline Bansheeboy18   us

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      #126

    Offline Bansheeboy18

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    Re: 17 Tooth Front Sprocket
    Reply #126 on: Sep 22, 2022, 07.56 pm
    Sep 22, 2022, 07.56 pm
    *Originally Posted by fred_jb [+]
    I can't see any justification for Triumph saying that this will void the engine warranty. The engine and gearbox is designed to work across a wide range of road speed and engine rev combinations, and the flat torque curve facilitates this. All this may do is slightly shift the typical gear change points, and I'm sure that has much less effect than the variation between riders in which gear they would select for similar riding situations. In other words that seems like nonsense!

    If anything this mod gives the engine an easier time in high gears and at high speed, without any noticeable adverse affect on top gear roll on acceleration, while at the bottom end the change is not enough to cause the engine to struggle in the lower gears. On a recent trip I still found it fine to go around small traffic islands in second gear without lugging the engine, and always had the option to change down to 1st if required, and there is absolutely no situation where 1st gear is now to highly geared, as it was far too low originally.

    I agree, for triumph to void the warranty it would have to be proven that the sole contributor to engine failure was a sprocket.
     

  • Offline gotagreyone   au

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      #127

    Offline gotagreyone

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    Re: 17 Tooth Front Sprocket
    Reply #127 on: Sep 22, 2022, 10.52 pm
    Sep 22, 2022, 10.52 pm
    There is no way anyone at Triumph who has any knowledge or authority at all would ever say a sprocket change would void the warranty. Whoever suggested that has made it up.