Overheating - Kawasaki ZX-10R.net
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post #1 of 28 Old 08-25-2008, 12:26 PM Thread Starter
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hi guy's...big problem..in slow trafic temp guage reading 115. hiway speed low 80s, fan does come on at 90deg.. this started about a month ago... since then replaced antifreeze with engine ice..no diff..replaced oil ..no diff.. overflow is full.. i am running a gipro with secondary valves mod.. but this system has been done since spring, and runs great... what could be the cause of overheating? bike only has 18k, never track riden...99% riden to work only.. i have set the gipro to neutral ( o mode ) to see if it's because of timing.. no diff...on idle temp creeps up to 114deg... can it be the secondary valve mod? need help..don't wan't to ride until problem is resolved...thanks guy's for any input.
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post #2 of 28 Old 08-25-2008, 12:42 PM
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make sure you dont have an airpocket in the cooling system. I dunno else wise?? Possibly the old thermostat?

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post #3 of 28 Old 08-25-2008, 12:53 PM
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problem with the impeller/pump? air pocket in the system? coud be the thermostat as well
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post #4 of 28 Old 08-25-2008, 12:54 PM
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Is it running very lean, considering the secondary butterfly reprogramming? Getting stuck in summer traffic, with no cooling air flow for the radiator, will drive temps up and keep them there.
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post #5 of 28 Old 08-25-2008, 01:04 PM Thread Starter
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this problem just started out of the blue...was good in traffic..after the problem started i changed the coolant no effect, disconnected the tre..no effect.. the overflow is full ant no coolant leaks..it's not ridden hard. only used it a dozen times this year..the fan does come on

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post #6 of 28 Old 08-25-2008, 02:38 PM
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I agree with the lean part. Mine usually runs a little less than that in traffic (107-ish) and like yours, about low 80's when moving.
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post #7 of 28 Old 08-25-2008, 02:55 PM Thread Starter
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ok..but it has never gone over 100deg and that's in 30deg weather in stop and go traffic.... 115 is way to much. it'll creap to 115 at idle! what the crap is going on? not thinking it's the thermistat..start moving and the temp starts dropping...possible it's the waterpump?
need more thought's guy's.. please.
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post #8 of 28 Old 08-25-2008, 03:34 PM
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+1 on the air pockets deal. When you refill the cooling system at the radiator cap, get as much air out as possible, then run the engine for a few seconds, then refill it again. If the level is up to the bottom of the little housing where the radiator cap sits after the engine has run and then cooled down, this is not the problem.

Before going after the really expensive stuff, make sure the coolant temperature sensor is within specifications. The engine could be fine, but displaying higher than the real temperature.

Next thing to check is the actual operating temperature of the thermostat to make sure *that* is within specifications. And make sure the little vent hole isn't blocked.

Make sure the radiator isn't half blocked with bug guts with the other half of the fins smashed in from rock hits.

Make sure the radiator cap is good. For the price of a new one (you can get the same one at Canadian Tire, many older Honda cars use the same cap) just replace it.

The secondary air injection system won't make a significant difference to how much heat goes into the cooling system.

If the above check out, then it's time to drain the system and inspect the impeller of the water pump, and while you are at it, inspect the insides of the hoses and pipes for debris or blockage.

If the cooling system checks out, then it's possible that you have a lean condition. If you haven't changed anything in the electronics then there could be something going wrong. Clogged fuel injector, low fuel pressure (bad pump? seen that happen - or bad fuel pressure regulator, which is inside the pump assembly), clogged pick-up screen (inside pump assembly), etc.

The possibility of a blown head gasket has to be considered. Usually, this will show up as the reservoir getting full but not sucking the coolant back into the engine when it cools down, and this will get progressively worse. In the early stages, you might not notice this. I've had a few blown head gaskets over the years on various bikes, but it hasn't been reported as a big problem on the ZX10R's.

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post #9 of 28 Old 08-25-2008, 03:40 PM
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I think this is normal mine runs up to 115 and then back down to 98 when the fan runs for a few then back and forth.

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post #10 of 28 Old 08-25-2008, 05:31 PM
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Are you guys talking Farenhiet or Celcius?, cause if your talking farenhieht, you are 100 degrees off, it is perfectly normal for these bikes to get up to 210-220F in traffic in the summer time, once on the open road it should cool back down to 180-190F, with ambient temps over 90F.

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