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Info ZX2r 1989 exhaust

Discussion in 'Kawasaki 250cc In-line 4's' started by zx2arr, Apr 3, 2019.

  1. zx2arr

    zx2arr Member

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    Hi People,

    Is it actually worth upgrading the stock exhaust on a 1989 ZX2R ? Does it increase the efficiency or power at all? or is just for sound?

    Thanks
     
  2. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    In my experience, the more open you go, the worse the rich spot at 7,000rpm gets, and the worse the low end torque becomes. It's a matter of the tune in the carbs and the camshaft profile/characteristics. Peak torque is at 14,000, at 7,000 there is a torque dip which a modern bike would tune out with an exhaust butterfly system a la EXUP on the FZR250's.

    If all you're after is a better sound, then I would find an aftermarket pipe with a removable baffle.
     
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  3. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    But keep the baffle close by ... my street leads to the local Tafe and a high school .... so many little boys on their LAMS bikes with the baffle out .... my neighbour mowing his lawn on a Sunday sounds better ... they are woeful to hear

    :D
     
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  4. TonyZXR

    TonyZXR Active Member Premium Member

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  5. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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  6. TonyZXR

    TonyZXR Active Member Premium Member

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    Yeah its definitely bent in a few places. Bent further on the bend . But it isn't 800 bucks .

    Sent from my SM-N960F using Tapatalk
     
  7. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Try it and see how it feels/runs. Someone mentioned a dead spot at 7,000rpm which seems to affect the ZXR250C engines/model due to the TCI units (see below) they run. The ZXR250A TCI unit (21119-1263) has a drop off at 8,000rpm.

    ZXR250C TCI 21119-1316 ignition curve
    TCI 21119-1316.jpg
     
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  8. Andych

    Andych Well-Known Member Premium Member

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    I very much doubt that you would be able to get it sent here through Buyee... It certainly wouldnt be allowed on EMS as a complete exhaust.. the other option is to do it through Import Monster who regularly have containers coming from Japan... the cost isnt a lot.. I ended up having to bring my SRX250 3WP fuel tank in through them as none of the other carriers were interested... I have had the same result when enquiring on a full exhaust.. although I did manage to bring 2 SS engine pipes in via EMS but I think I was lucky... but the cost was pretty high... you pay for Cubic , not actual weight and when you add GST etc what seems like a bargain definitely isnt... for smaller stuff you can count on the sale price being at least 3 to 4 times by the time it gets here... larger items would be even more.
     
  9. banner001

    banner001 Well-Known Member Premium Member Contributing Member

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    For the zxr400 race bikes a company called Ignitek make a CDi that's fully programmable for about £200...probably the easiest way to cure the ignition advance dip...
     
  10. banner001

    banner001 Well-Known Member Premium Member Contributing Member

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  11. flea

    flea Well-Known Member Premium Member Contributing Member

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    have one for my tdm850 which has a flat spot at approx. 2500 rpm then accelerates suddenly (when epi rules change just before release they cured the prob by retarding the ign instead of fixing the prob ) these ignitecs are a common replacement and work really well .. plus they are programable eg for racing .. don't know about straight from the factory for the zxr250 but the tdm are a plug and play set up .. good value for money .. think was about $350 at the time new from the aust importer
     
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    About 190 AUD plus shipping from the manufacturer.
     
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  13. banner001

    banner001 Well-Known Member Premium Member Contributing Member

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    Ive been wondering about measuring the ignition timing advance curves for a few of the CDI's across the various bikes.

    I notice that the 21119-1316 CDI is actually listed as a 1989 ZX250A (bailus) not a zxr...im assuming that the advance curves might be slightly different to the zxr, also the manual shows that the curve should be +45 degrees at 16,000rpm?

    From what i can see there are only 4 CDI's:
    21119-1263 - 1989 A1 and 1989 B1
    21119-1290 - 1990 A2 and 1990 B2
    21119-1322 - 1991 to 1993 C models and 1991 D1
    21119-1384 - 1994 onwards C models - this can also be fitted to C1-3 and the D1 model (though why would you...?)

    The 1384 is the 45 to 39bhp derestricted system and im guessing its just a change to the top end ignition advancing...but i would like to know.

    Im also not sure why there is a specific 1989 and 1990 CDi's as i can see no differences in the engines/output of the two bikes...if anyone has dyno'd the two of these CDi's on the same bike this would be nice to know...im maybe thinking it could be a midrange/fuel efficiency/torque thing??

    Im also guessing that there is very little difference between the 1290 and 1322 CDi's...though again, the only difference is that the C model has 9 as it includes a grey "anti-tamper" wire so you cant just hotwire the ignition like you can on the A (sorry A model users if this is news to you...you connect 2 wires together and your ignition key is fully bypassed).

    Ive also noticed that the zxr250 A1 and A2 fuse/junction box is IDENTICAL to the UK 1991-1994 zxr400...which is handy as ive already made an improved version :D (http://www.zxrworld.co.uk/zxr400oc/viewtopic.php?f=125&t=21973&p=127198#p127198)
     
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    Last edited: Jul 11, 2019
  14. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Very clever making your own PCB's. :thumb_ups:
     
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  15. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    21119-1316 Ignition map is...

    21119-1316 TCI.jpg
     
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  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    @banner001 (nice work on the PCBs) & @Frankster this is too good to be lost in the wrong thread. Care to make a new one and we will get the big cheese @GreyImport to sticky it.
     
  17. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Will do.
     

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