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Thread: RB30 GQ limiter

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    RB30 GQ limiter

    Hey guys, suddenly my gq seems to be hitting a limit around 4500rpm. Pretty sure it used to be higher than this. Anyone know what the stock limit is?

    I'm guess the springs on the rotor button have worn and that's why it's coming down. Rotor button is only 2 years old. Anyone know if I can get replacement springs or fix these ones?

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    Patrol God taslucas's Avatar
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    Are you able to borrow another rotor button to rule that out?

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    Nah, but I can probably remove the springs and find out. Definitely feels like limiter, pulls hard until then.

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    Patrol God taslucas's Avatar
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    Could it be starving of fuel

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    Honestly, I don't think so. Filter is new, secondary's are working etc. It does it in every gear, including neutral, which makes me think limiter. If it was starving of fuel, I'd think it'd be more noticeable with more load/higher gears.

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    Patrol God taslucas's Avatar
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    I had a quick eBay look and it appears the rotor buttons are only around $20? Cheap enough to try and if it's not the problem then I guess you have a spare.

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    Patrol God taslucas's Avatar
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    Also I've heard that those carbys have a small mesh filter that can be over looked

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    Quote Originally Posted by taslucas View Post
    Also I've heard that those carbys have a small mesh filter that can be over looked

    >>>tappin from tassie
    Yes, that's gauze filter at the fuel entry to the carby float chamber from outside.
    In mine, it always looked clean, but mine is dual fuel and doesn't run on petrol much.
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    Legendary dom14's Avatar
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    Quote Originally Posted by Throbbinhood View Post
    Hey guys, suddenly my gq seems to be hitting a limit around 4500rpm. Pretty sure it used to be higher than this. Anyone know what the stock limit is?

    I'm guess the springs on the rotor button have worn and that's why it's coming down. Rotor button is only 2 years old. Anyone know if I can get replacement springs or fix these ones?
    I doubt it's the rotor button.
    Is the above rev limit same with no load revving?
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    Yep, same in neutral @dom14

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