Ninja 250 Muffler Question

Discussion in 'New To Racing' started by mksiemens, Feb 28, 2012.

  1. mksiemens

    mksiemens New Member

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    k. So the rules for 250 production require the stock muffler
    My bike came with an aftermarket muffler and I'm trying to find a stock one for cheap
    I found one, but it's missing the chrome heat shield
    [​IMG]

    So it's that piece there

    I'm assuming that without that piece it would be considering altered, but figured I would check.

    So yah I wondering if it would be "legal" without that section?
     
    Last edited: Feb 28, 2012
  2. Ryan Whittle

    Ryan Whittle Rider of Orange V-Twins

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    that would be legal.
     
  3. Dean

    Dean Just a beer league racer

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    Jay Tait ran all last year without the chrome parts. It's still legal provided the muffler has not been altered internally.
     
  4. Reckless

    Reckless New Member

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    2011 rules or 2012 rules?
     
  5. Dean

    Dean Just a beer league racer

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    Angus, you were in the rule book meetings, that rule did not change.
     
  6. Reckless

    Reckless New Member

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    The discussion at the rule book meeting was to change the 250 rules to reflect Supersport rules, that would mean "a stock unmolested street legal exhaust can" but not necessarily a stock 250 muffler. That would be a change in the rules from 2011.
    I don't know if that made into the 2012 rule book or not. The 250 cup series might have different rules than WMRC at Mission since it will run on 2 different tracks with different sound requirements. Greg Moore may allow aftermarket exhausts if they meet the sound requirements, however WMRC rules at Mission will require a stock muffler of some kind but until the 2012 rules are published we don't know which.
     
  7. KBELL408

    KBELL408 New Member

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    I am with Angus,the rule as discussed and agreed upon was to reflect the SS/"Mission" rule of a oem,stock production street muffler,being mechanically baffled and unmolested(no gutting).Meaning ANY stock production street muffler etc.This rule gives racers options when building a race bike from say a crashed or ex street modified bike or buying a race prepped 250 that only has a race system.(See Shawn Beckers 250s for sale)
    The other reason for this is to encourage visiting racers.A 250 racer can replace his race only muffler with a street legal muffler just like visiting 600 racers.
     
  8. Dean

    Dean Just a beer league racer

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    That too is my understanding. It must be a stock muffler. Stock from which bike? It doesn't matter. As long as the innards are working and not gutted, it's good to go. You should see those published rules out soon. I've also posted those notes in the forums here:

    http://www.westwoodracing.com/forums/showthread.php?t=5544

    It states for 250s: "stock unmolested mechanically baffled muffler is required". It does not specify 250 stock, just stock.

    I also believe that there was one statement that will get a few people. That was, "if it's not expressly allowed, it's not" That way if we miss something, people cannot take the creative route and circumvent the spirit of the rules.
     
  9. Reckless

    Reckless New Member

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    So Mksiemens as Dean said, anything that bolts on to the outside of the muffler may be removed as long as the muffler body itself or it's internals haven't been modified.
     
  10. mksiemens

    mksiemens New Member

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    perfect. Thanks!
     
  11. *Jay*

    *Jay* Member WMRC Exec

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    Chrome is for cruisers
     
  12. Dean Thompson

    Dean Thompson New Member

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    Chrome shaves 1/2 a second off lap times.
     
  13. *Jay*

    *Jay* Member WMRC Exec

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    UPDATE

    The 250 class is supersport rules, meaning any exhaust system is allowed as long as the bike meets the sound limit at Mission.
     
  14. Dean Thompson

    Dean Thompson New Member

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    Only took 4 years to answer the question? The efficiency around here is improving! :D
     
  15. *Jay*

    *Jay* Member WMRC Exec

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    I thought this thread was dead but it has been looked at multiple times recently, so I just wanted to bring some guests up to speed.
     
  16. Dean

    Dean Just a beer league racer

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    If I wasn't so gravitationally enhanced, I'd very much consider racing a 250.
     
  17. HWY99

    HWY99 Team Green

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    As they say, losing 10+ lbs is better than spending thousands of dollars on engine mods and light weight parts. Maybe there should be a ballast compensation or handicap rule for the gravitationally enhanced?
     
  18. Jaybo

    Jaybo if you want blood

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    Do it! It hasn't slowed me down any..


    Err. Wait a
     

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    Last edited: Mar 1, 2016
  19. Ryan Whittle

    Ryan Whittle Rider of Orange V-Twins

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    Are ceramic muffler bearings allowed?
     
  20. HWY99

    HWY99 Team Green

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    bearing.jpg

    If allowed, Marbod should have them in stock.
     

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