Help ZXR won't come up to temp?

What's the ambient temperature at the times when you've been riding?

Hypothetically an air bubble preventing coolant flow meaning that the hot coolant never reached the temp sensor and thermostat and the cold ambient air preventing overheating.

Starting the bike with the radiator cap off and let it run for a few minutes to see if you get evidence of flow through the radiator

Other possibility is that the water pump impeller has lost it's teeth through corrosion resulting in the same symptoms as a trapped air bubble.

Third possibility the thermostat is the wrong temperature range and the flow commencing sooner prevents the engine from going higher into the temperature range. They may have an opening temperature stamped on them somewhere.

Please note that I have no actual experience with ZXR's.

 

The multiple bleeder sounds like the most plausible explanation.

I do seem to recall someone else on the forum with the pump impeller blades virtually non-existent because they were either corroded aluminium or plastic which had disintegrated. I don't recall what bike it was though.

It's simple to check though which is a good thing

 

My zxr stays on that bottom line on 35c days until you start hitting some red lights, cools back down once back on open road though, & it can idle for ages before its suddenly starts warming up, Theres a water temp switch on the head just above the starter motor that could be the culprit, it can be taken out and tested.If your radiator and hoses are warm everything seems ok then indicating its moving through, try squeezing the hose that comes out the top of the water pump(the bleeder hose)as you start up, you should feel it pressurize which means the impellor is ok, I only ever bleed from there as its usually not feasable to remove the airbox etc to get to the other bleed nipple, just fill the last 3-400ml extra slow and squeeze the hose near the rad cap to get those bubbles. -Im having a similar sort of issues with cooling where after each ride it gets hot theres about a 200ml air pocket left in the radiator which wont recover fluid from the reserve tank, if I remove the cap the fluid sometimes flows back through & fills the rad,other times it wont, the reserve is full, its either the cap itself or the routing of the reserve hose, but the manual doesnt even mention that hose.

 

Yeah its the cap for sure, as soon as im out of hospital I will look at a replacement for it, whether it be an oem cap or a supercrap special. Does anyone know which cap ill need for the zxr??,cant check the manual & im only limited on my phone while in here.

 

rolls of various thickness gasket paper are a godsend...beats waiting for various replacement gaskets

 

That's what I do all the time, if you want to be certain of a a good seal - give all surfaces a coating of this stuff

http://www.supercheapauto.com.au/Pr...n-Form-A-Gasket-Sealant-Liquid-No-3-59mL/5355

 

Cheers, just had a look on google/ebay etc cant find much locally, might be a job for Mr Kawasaki next week

 

I took great pride once in making all my own gaskets, even had templates for each one,now I just use the Loctite blue gasket maker for all the covers,never had a leak. I even fixed both covers for a mates mc19 that had hairline cracks from overtightening,with a lightest smear over the inside of the crack, still holding up 2 yrs later