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Thermal switch temp in ZZR1100
nick9one1 - 18/11/23 at 12:47 PM

I dont have the original thermal fan switch and cant find details on what temp it engages.
the service manual only has details for the thermostat.

Thermostat:
Valve opening temperature 80 84C(176 183 OF)
Valve full opening lift more than 8 mm @95C(203 OF)

What would be the best option?

Thermal switches available:

80C on / 72C off ( 2C)
85C on / 77C off ( 2C)
90C on / 80C off ( 2C)
95C on / 85C off ( 2C)
100C on / 90C off ( 2C)
105C on / 95C off ( 2C)
110C on / 100C off ( 2C)

Thanks!

[Edited on 18/11/23 by nick9one1]


gremlin1234 - 18/11/23 at 05:10 PM

from that spec I would guess the 100/90 version

but wouldn't it be good if Kawasaki published parts catalogues, and you could just buy the correct switch...

https://www.kawasaki.com/en-us/owner-center/parts/31435/2000/ZR1100-C4
27010 1202
https://www.bike-parts-kawa.com/kawasaki-motorcycle/assignment_spare_parts/270101202


gremlin1234 - 18/11/23 at 05:19 PM

quote:
Originally posted by gremlin1234
from that spec I would guess the 100/90 version

but wouldn't it be good if Kawasaki published parts catalogues, and you could just buy the correct switch...

https://www.kawasaki.com/en-us/owner-center/parts/31435/2000/ZR1100-C4
27010 1202
https://www.bike-parts-kawa.com/kawasaki-motorcycle/assignment_spare_parts/270101202

but a different diagram indicates
27010-1372
so it may differ on the year of the bike


nick9one1 - 18/11/23 at 05:35 PM

I cant use the original switch as the cooling hoses/rad have all been swapped out.




I've found an 3rd party original switch that says it switches on at 100C




[Edited on 18/11/23 by nick9one1]


gremlin1234 - 18/11/23 at 07:03 PM

that should work fine on the input side of the rad.

or you could get an adjustable one.
https://uk.rs-online.com/web/p/thermostatic-switches/7334710


adithorp - 19/11/23 at 02:12 PM

Just bare in mind the switching temp will depend where you put the switch. In the engine before the stat' it'll be on at 95-105⁰c, after the stat', in the top hose 90-100⁰c and in the rad 85-95⁰c might be what you'd commonly expect.

I know my R1 switches via the ECU from engine sensor at 105⁰c. Out of curiosity, I've had a test light on the rad mounted (90⁰ on) switch (just used as a bung) and that switches at virtually the same time.

An alternative is use a dual switching sensor. They're made for twin fans coming on at 2 temps. If the lower temp isn't good enough, swap the wires to the higher one.