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Thread: Ugly casting on rear drum

  1. #1
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    Ugly casting on rear drum

    Are the new (or even old) rear drums usually this ugly? Because I feel like this is just some exceptionally terrible workmanship.

    Edit: This is the stock rear of a 2017 SR400. Purchased the bike brand new in mid-december of '17.

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    Last edited by pandraztic; 01-14-2018 at 06:16 PM.

  2. #2
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    This ugly bit is where the manufacturing process fills the die mould with molten aluminium...its reffered to as casting flash. To tidy the component up, a manual operator [fettler] would have removed it and or should have 'blended it back' to the main casting area.To be fair mines not a million dollars better [78 SR500].What you have to remember is that these fettlers would have been paid on a piecework/bonus system,needless to say this is whats known in the trade as an RAF component. .....rough as f**k.

    Andy

  3. #3
    Ah, yes that's rougher work than most others I've seen...if you pulled the wheel apart and have it carefully machined down...or do it yourself you could improve it a great deal...

    There's always other Yamaha SR hubs around too...

    I have a Honda CB350 rear hub here that had been incorrectly machined...the completed wheel ran true but the hub casting wasn't concentric with the axle...dodgy work but practically it worked fine.

    I've also seen a guy machine away all the cooling fins and some of the hub metal on a CB750 rear drum...personally I considered what he'd done dangerous...but he loved the end result...he liked the 'smooth look'...

    SR
    Last edited by stewross; 01-10-2018 at 08:06 AM.
    ...'Any unnecessary items on the bike, that it doesn't really need, shouldn't be there!'. (Café racers creed). SR..

  4. #4
    Senior Member gcrank1's Avatar
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    Only that amount of flashing material was removed to bring the drum into balance.
    LOL...yeah....right....
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  5. #5
    Possibly done by a 'beginner' casting cleaner-upper...

    SR
    ...'Any unnecessary items on the bike, that it doesn't really need, shouldn't be there!'. (Café racers creed). SR..

  6. #6
    Senior Member MadMax's Avatar
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    Quote Originally Posted by stewross View Post
    Possibly done by a 'beginner' casting cleaner-upper...

    SR
    Fettler, n. A person who fettles metal castings or pottery.

    Probably just a lazy git, I'm sure they have them in Japan just like everywhere else

  7. #7
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    Yup that would bug me. I'd look at it as a winter project. Oh um... you have no winter. Anyway if you're in the need to tinker, some disassembly, a little filing, grinding & polishing, maybe hydra blasting
    & you got yourself a fantastic looking rear drum.

    Steve

  8. #8
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    Quote Originally Posted by rotatorpotator View Post
    Yup that would bug me. I'd look at it as a winter project. Oh um... you have no winter.
    My original thought as well, LOL. Honestly, I'm just exceedingly disappointed that I bought a brand new bike with workmanship that poor on it. I'd be embarrassed releasing something like that. I honestly want to switch to the cast aluminum wheels though at some point as spoke wheels wig me out a bit on anything other than a bicycle.

    But, mostly just wanted to share and see if anyone else had any odd issues with the new FI models and having terrible finishing work done on them as well.
    Living the Hi Life. 2017 SR400

  9. #9
    If you wanted to the hub could certainly be improved to where you'd be happy...here's one from my 400 here...2005 model.

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    SR
    Last edited by stewross; 01-12-2018 at 07:52 AM.
    ...'Any unnecessary items on the bike, that it doesn't really need, shouldn't be there!'. (Café racers creed). SR..

  10. #10
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    Quote Originally Posted by stewross View Post
    If you wanted to the hub could certainly be improved to where you'd be happy...here's one from my 400 here...2005 model.

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    SR
    That looks GOOD Stew! What chain guard and shocks you running? Also, tire? I just like the look of that rear. Might need to copy, lol
    Living the Hi Life. 2017 SR400

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