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Thread: I've got an aftermarket exhaust. How to replace jets and unifilter installation?

  1. #1
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    9th January 2013 - 06:51
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    I've got an aftermarket exhaust. How to replace jets and unifilter installation?

    Hi guys,

    Recently picked up an after market exhaust and was recommended to install bigger jets as well as replace the air filter with a unifilter. Just wondering where I'd pick up the larger jets and if anyone knows of a place that would install the unifilter and jets as I don't have much experience with engine adjustments.

    Bike is a 1990 Honda Cbr250rr mc22

  2. #2
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    4th November 2007 - 13:39
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    gets your jets from the government or have they scrapped them??
    and the uni filter
    find your local university

    plastic fabricator/welder here if you need a hand ! will work for beer/bourbon/booze

    come ride the southern roads www.southernrider.co.nz

  3. #3
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    17th July 2005 - 22:28
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    Get jets from this fellow
    http://www.trademe.co.nz/Members/Lis...&member=106097
    I would recommend buying several sizes. Or just get a shop/friendly local KB member to do it for you

    You'll need to remove the tank/carbs.
    May as well clean them, clean fuel filter and sync the carbs while you're there


    The first step, however, is figure out if it's lean or not.
    You'll get flat spots where the power just goes away when lean and backfiring/popping when you get off the throttle

    Being a CBR I expect you'll have flatspots at 3-4000rpm, 8-9000rpm and somewhere above 12 is the usual for them with a free flowing muffler.
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




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  4. #4
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    Feck it man - stick the pipe on, go for a run and do a plug check to see hows it is running. Old school. Adjust to suit if you find it lean.

  5. #5
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    Quote Originally Posted by AllanB View Post
    Feck it man - stick the pipe on, go for a run and do a plug check to see hows it is running. Old school. Adjust to suit if you find it lean.
    Also pays to run it on 95

  6. #6
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    Make sure the jets are E marked or you'll be non LAMS compliant

  7. #7
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    Quote Originally Posted by Haggis2 View Post
    Make sure the jets are E marked or you'll be non LAMS compliant
    pfft and there guna no how?

    and isnt a 250 automatically lams approved regardless of mods?
    "Motorcycles and scooters with an engine capacity of 250cc or under are automatically LAMS-approved, with the exception of a small group of 250cc motorcycles are not approved for learner and restricted riders due to their high performance capabilities."

  8. #8
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    Quote Originally Posted by sketch View Post
    pfft and there guna no how?
    They sniff the exhaust.


    Quote Originally Posted by sketch View Post
    and isnt a 250 automatically lams approved regardless of mods?
    No.
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
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  9. #9
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    [QUOTE=ducatilover;1130537048]They sniff the exhaust.


    Bahahahahaha

  10. #10
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    Quote Originally Posted by sketch View Post
    pfft and there guna no how?

    and isnt a 250 automatically lams approved regardless of mods?
    "Motorcycles and scooters with an engine capacity of 250cc or under are automatically LAMS-approved, with the exception of a small group of 250cc motorcycles are not approved for learner and restricted riders due to their high performance capabilities."
    Are you feeling particularly slow today ... the smiley indicates sarcasm at it's most obvious ...
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  11. #11
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    Quote Originally Posted by AllanB View Post
    Feck it man - stick the pipe on, go for a run and do a plug check to see hows it is running. Old school. Adjust to suit if you find it lean.
    I agree ... putting such a muffler on a 13 year old 250cc motorcycle is unlikely to make much difference to performance or engine management. Probably as much difference to using 95 instead of 91 fuels.
    When life throws you a curve ... Lean into it ...

  12. #12
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    23rd March 2008 - 16:34
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    Quote Originally Posted by FJRider View Post
    I agree ... putting such a muffler on a 13 year old 250cc motorcycle is unlikely to make much difference to performance or engine management. Probably as much difference to using 95 instead of 91 fuels.
    My Gsx250 (2002) is all factory and is meant to run 91 however I suspect the carb has been tuned for 95 becasue at 9k+ it pings on 91 and I only run it on 95 now even if it does smell alittle rich (would rather rich then lean)

    Plugs arent showing it running hugely rich but I can smell it

  13. #13
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    Quote Originally Posted by Dragon View Post
    My Gsx250 (2002) is all factory and is meant to run 91 however I suspect the carb has been tuned for 95 becasue at 9k+ it pings on 91 and I only run it on 95 now even if it does smell alittle rich (would rather rich then lean)

    Plugs arent showing it running hugely rich but I can smell it
    Running with a dirty air filter will make it run rich. To my knowledge ... running 95 instead of 91 wont make it run rich.

    Tuned for 95 .. ??
    When life throws you a curve ... Lean into it ...

  14. #14
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    Quote Originally Posted by Dragon View Post
    My Gsx250 (2002) is all factory and is meant to run 91 however I suspect the carb has been tuned for 95 becasue at 9k+ it pings on 91 and I only run it on 95 now even if it does smell alittle rich (would rather rich then lean)

    Plugs arent showing it running hugely rich but I can smell it
    Change your plugs and set the gap correctly. It shouldn't pink on 91.
    Are you reading your plugs correctly?
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
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  15. #15
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    23rd March 2008 - 16:34
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    Brand new air filter
    Brand new plugs

    I even pulled up the below to confirm I was reading the plugs right

    http://suzukitu250x.blogspot.co.nz/2...our-plugs.html

    on 91 read it as hot/lean

    95 reads ok - cold/rich

    no idea whats going on but again id rather run 95 and have it run rich then hear it pink at high rpm

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