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Help 89 ZXR250-A - Wont Cold Start - Will Warm Start

Discussion in 'Kawasaki 250cc In-line 4's' started by natezx2r, Jun 23, 2015.

  1. natezx2r

    natezx2r Active Member

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    Hi Team,

    I have been pottering around here for a little while.. I had rebuilt my zxr250 last year except the top end due to head/mid gasket cost. The shims were done before I purchased the bike.

    I thrash my little S..., Stunt it sometimes an only to the best of my ability. Mainly rolling stoppies, Wheelies, Rolling burnouts.

    Im having issues with cold start for the past two months, Carbies have been pulled down countless times there is nothing wrong with them or the settings/balance.

    In speaking to a Moto3 technician on the weekend at the Toprider track weekend where is trashed it around for two days straight ( Blowning my rear shock on day one ). He believes my valves have stretched.

    Reason for this determination, if i bump start an get heat in to the engine she will fire up no dramas. if it gets to cold I have to bump start again.

    Lucky I live on some what of a hill at home for the morning commute.

    Any Ideas out there or opinions?

    Ps. I have uploaded some of my shenanigans for the viewers pleasure

    11393388_10152771942001021_854297532983107471_o.jpg 1064481_832076236860536_4885884251222484152_o.jpg 11102800_10152636957071021_7159370485328438377_n.jpg 10262089_10152773669376021_8257851132631997634_n.jpg 10344809_10152621329656021_1650477943822794638_n.jpg
     
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    natezx2r, Jun 23, 2015
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  2. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Hi mate, good to see someone else in Sydney!!! Old pacific and eastern creek photos?
    Misses had the same issue on her zxr250c.
    To be honest there is only a hand full of things it can be. carbs (pilot screws, jets, floats ect ect ect), fuel lines, petcock, idle adjustment, choke.
    That's it. If the carb boots (connecting carbs to intake), gaskets inside carbs or anything is damaged leaking air in then it will cause these issues.
    With old bikes its hard to get it perfect sadly, on some bikes I adjust the idle screw as I go to get it started then turn it down as it heats up along with the choke. Having a slightly cracked throttle helps like only a touch.
    Good strong battery and blue sparks. That's it.
     
    Damus, Jun 23, 2015
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  3. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    I suppose friction is another factor. If your having to push starting it, maybe your clutch is slightly engaged and the starter motor cant handle it. Or maybe you need an oil change because things aren't lubed properly.

    Maybe its electrical. Bad fuse, starter or relay.

    Process of elimination.
    If you know 100% your fuel air is good and your trying to start it with start motor in neutral and you have changed oil recently id be looking at your electrical's.
    check battery is getting good volts with a multi meter and go from there.

    After some quick research http://www.kawariders.com.au/archive/index.php/t-16257.html I found this in regards to zxr250. This guys issue ended up being the starter motor.
     
    Last edited: Jun 23, 2015
    Damus, Jun 23, 2015
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  4. natezx2r

    natezx2r Active Member

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    Thanks Damus!,

    I have already been through the process of the above all is within spec. I think Ill just do a complete rebuild send the head off for a shave and reseat new valves

    Engine Rebuild.JPG
     
    natezx2r, Jun 23, 2015
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  5. natezx2r

    natezx2r Active Member

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    Yeah Mate,

    Eastern Creek an old Pac they're my home away from home
     
    natezx2r, Jun 23, 2015
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  6. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    "I think Ill just do a complete rebuild send the head off for a shave and reseat new valves"
    The zxr's are already pretty high compression stock, I think skimming the head is asking for trouble lol.
    I see you have an aftermarket can on it, do you also have a hi-flow air filter on there? If yes id probably consider turning the pilot screws to a slightly richer setting if your having issues on warm up.
     
    Damus, Jun 23, 2015
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  7. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Or do u just mean for resurfacing's sake?
     
    Damus, Jun 23, 2015
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  8. zixxer

    zixxer Well-Known Member

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    check the valve clearances again mate, and where did you get the prices for them parts, they seem way too cheap.
     
    zixxer, Jun 23, 2015
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  9. kiffsta

    kiffsta Senior Member

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    your stretched valve theory is plausible, have you done a compression test ?
     
    kiffsta, Jun 23, 2015
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  10. natezx2r

    natezx2r Active Member

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    @Damus - Resurfacing the head mate.

    @zixxer - The prices are from China - Ali, Japan - Kawasaki, UK Forget where, and some from motorcylewarehouse AustralianIf you know where else I can source all of these parts fell free to to pass on.

    @kiffsta - Yea I use to rebuild engines for a while, Totally forgot about the plausibility of this. Ill be doing a comp test this weekend, only thing is I'm yet to find the Factory Comp specs
     
    natezx2r, Jun 23, 2015
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  11. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  12. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    I thought the A model had a 48 bore size.
    quick edit, yeah i think thats for the C model. A model will be slightly different I think. (probably not by much though haha)
     
    Last edited: Jun 23, 2015
    Damus, Jun 23, 2015
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  13. zixxer

    zixxer Well-Known Member

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    i think slightly smaller bore and a slightly longer stroke.

    and those prices are good nate but i would be sus with the chinese valves.
     
    zixxer, Jun 23, 2015
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  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    If you can bump start, then it could be a weak battery. You need to get a multimeter and check the battery voltage when you press the starter. Anything less than 12v will struggle to start the bike.

    These old 250's like strong batteries. You want a sealed or AGM battery. Motobatt or SSB Powersports.

    Chinese valves should be alright, but I do not trust their piston rings to fit OEM pistons. The chinese rings will fit chinese pistons though.
     
    Linkin, Jun 23, 2015
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  15. Murdo

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

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    Are you using full choke to cold start? and are you sure it is working?
     
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    Murdo, Jun 23, 2015
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  16. Joker

    Joker See "about me" for contact details. Contributing Member

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    Yeh I'm with Murdo. Check the choke operation first, next compression (rings or valves). Leakdown test will confirm, clearances if you have more time.
     
    Joker, Jun 23, 2015
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  17. natezx2r

    natezx2r Active Member

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    @Damus @zixxer - Correct 48mm Bore,

    @zixxer - I know another chap utilizing Chinese valves, he is happy with them. I haven't found new pistons yet - Rings yes easy to find.

    @Murdo - Yes choke is working correctly

    @Stu - As per above - This weekend I'll be doing Comp test.
     
    natezx2r, Jun 24, 2015
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  18. briches

    briches Active Member

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    I'll jump in and say i had this issue, I replaced my battery with an SSB AGM battery with a 200CCA rating and am cold starting right away.
     
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    briches, Jun 29, 2015
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  19. swanamon

    swanamon Active Member

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    Hi Nathan!

    Good to see you here. This is Tk, the other zx2r owner at the TopRider coach and setup weekend in June.

    My zx started doing the exact same thing with the cold start issue. I replaced my battery and all good now.

    Maybe you can get away with maintenence on your battery is the acid levels are low.

    Question for you, are you running an inline fuel filter?

    -Tk
     
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    swanamon, Jul 12, 2015
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