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Help What makes a bike run hot?

Discussion in 'Kawasaki 250cc In-line 4's' started by Adam Giles, Jun 11, 2017.

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  1. Adam Giles

    Adam Giles Well-Known Member

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    Wish I'd know that before putting airbox and tank back on!

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    Adam Giles, Jun 12, 2017
    #21
  2. Adam Giles

    Adam Giles Well-Known Member

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    You sure that's the bleed? Took it completely out, but there's no sign of fluid of any kind behind it.

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    Adam Giles, Jun 12, 2017
    #22
  3. Rossco_Perth

    Rossco_Perth Confirmed Tinkerer :)

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    On my 250A there was an o-ring under the head of that bolt & once removed coolant bubbled out of the hole?



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    Rossco_Perth, Jun 12, 2017
    #23
  4. Adam Giles

    Adam Giles Well-Known Member

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    Hmm, kind of makes sense it would be a bleed hole. No O-ring on mine. I even started the bike up to see if any coolant would come through.

    Anyone else looked at this?

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    Adam Giles, Jun 12, 2017
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  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Open the bleeder when the bikes at operating temp and the thermostat has opened and coolant is flowing
     
    GreyImport, Jun 12, 2017
    #25
  6. Adam Giles

    Adam Giles Well-Known Member

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    It's going to difficult to get to that bolt with the engine hot and running...

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    Adam Giles, Jun 12, 2017
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Undo it before u start it and its cold ... leave it screwed in a few turns then bring the bike up to temp and see if coolant escapes
     
    GreyImport, Jun 12, 2017
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  8. Adam Giles

    Adam Giles Well-Known Member

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    Is this something you've done?

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    Adam Giles, Jun 12, 2017
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  9. Adam Giles

    Adam Giles Well-Known Member

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    Actually, wouldn't matter if the thermostat was open or not. This bolt is lower than the radiator filler cap, so gravity alone would force any air out of the this hole.
    If this IS the coolant bleed bolt, then I have other issues that need looking at...

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    Adam Giles, Jun 13, 2017
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  10. sharky

    sharky Well-Known Member

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    Was the rad cap off when you tried to bleed? I also cant be bothered most of the time to take off a tank & airbox to get at this bleeder, I usually just pump the hose under the rad cap gently while keeping the coolant topped up above the hole.
     
    sharky, Jun 13, 2017
    #30
  11. Adam Giles

    Adam Giles Well-Known Member

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    Yeah, rad cap was off so fluid should have flowed out of that bolt hole, if it is the bleed bolt. Fluid needed a slight top up, so running engine had chased some air out of system.

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    Adam Giles, Jun 13, 2017
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    theres no pressure if the cap is off .... that bleeder has more than likely been put there as air gets trapped in that spot because of the design of the system when the coolant is changed/refilled
    loosen the bolt and run the thing up to temp
    if still nothing comes out then pull it all off (housing and hoses ) and see if its blocked or wateva
     
    GreyImport, Jun 13, 2017
    #32
  13. Adam Giles

    Adam Giles Well-Known Member

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    It shouldn't need pressure to bleed the coolant. Gravity alone would run the fluid through.
    Is this definitely a bleed point?

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    Adam Giles, Jun 13, 2017
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  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    • Agree Agree x 1
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    GreyImport, Jun 13, 2017
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  15. Adam Giles

    Adam Giles Well-Known Member

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    Anyone know what this highlighted part is?

    Capture1_zpsu3ifdfei.jpg

    It attaches to the back of the "bleed bolt", which isnt a bleed bolt on my engine. There is no hole to bleed anything out of (no matter how much pressure the system is under).
     
    Adam Giles, Jul 25, 2017
    #35
  16. Joker

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

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    Fan - check
    Thermostat - check
    Coolant - check (assume it's anti-boil)?
    Air in the system - check
    Water pump & flow - ?

    I'd be looking at that, what you're talking about sounds like your coolant isn't actually flowing... if it's not flowing it will just sit there in the one spot - fine while the bike is moving/when the fan comes on but all other times is running hot.

    I wouldn't write it off as "just the bike" if you're sure it's abnormal. I had abnormal heat on my FZR for a while and it turns out the fan wasn't working - cooling systems aren't that complex. I'd test it by pulling off a "high" hose somewhere, filling the system with tap water and seeing if it pumps through at idle. Wouldn't worry about the impact that removing a hose has on the "pressure" of the system because really all the pressure does is raise the boiling point. So should be OK for the purposes of this particular test.

    Hope that helps.
     
    Joker, Jul 25, 2017
    #36
  17. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Adam, that part is for the area in the engine that the engine mount bolt goes through. There's a little rubber hook on that part and it goes around the bolt as it feeds through the engine. It's like a vibration absorber. It's painful as it will block the bolt going through if not properly aligned. Before you put the bolt through, you need to look through the engine mounting hole and make sure you have a clear passage.

    Also, the bolt everyone keeps talking about isn't really a bleed bolt. There is a bleed nipple (part number 43056 on your diagram) in the cooling circuit that you use for bleeding air out of the circuit. Air gets caught in that spot. All other air is bled through the highest point of the circuit which is the radiator cap. The overflow circuit is built into the radiator cap nozzle for a reason.

    And finally, your bike is running right. It will be running too hot when the gauge needle enters the RED area of the gauge. If you're worried about it getting too hot, you can bypass the fan circuit and install a simple on/off switch that you can use to activate the fan whenever you pull up at the lights. I did this on one of my ZXR's and it works fine (when I remember to turn it on).

    OnOffFan.jpg
     
    Frankster, Jul 25, 2017
    #37
  18. Adam Giles

    Adam Giles Well-Known Member

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    Water pump looks fine, so tested the flow. Put a litre of water in and started the engine with the red cap off. Water is flowing.

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    Adam Giles, Jul 26, 2017
    #38
  19. Adam Giles

    Adam Giles Well-Known Member

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    Yeah, starting to think this bike is just a hot bike. Just that my other 2 zxr250s hardly ever got hot enough to need the fan.
    Fan comes on fine and keeps temp in check, so happy with that.

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    Adam Giles, Jul 26, 2017
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  20. Joker

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

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    Well if all tested then yeh.. just must run hot. Can't think of anything else it would be (unless you're not using anti-boil coolant I suppose)
     
    Joker, Jul 26, 2017
    #40
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