Thermostat Equivalent for K75

[hoodun]

Does anyone know of a Thermostat equivalent for a 1994 K75? I refuse to pay $54 for routine maintenance. 

[Grim]

It's fuel injected and has a o2 sensor please don't run them without a thermostat.

 A thermostat is critical to it operating correctly and its critical that it be rated the same as stock. If the engine runs too cold it will not go closed loop and will burn extra fuel. 

Thermostats often will make the engine run cooler then no thermostat. It slows the flow and allows more time for heat to be shed in the radiator.

 Advanced auto parts carries motorcycle tune up stuff. They list the thermostat for $19.

It

[rbm]

The BMW part is a Bypass style thermostat with jiggle pin., 82°C or 89°C, Flange: 48mm, Foot: 27.7mm, Height: 35mm



I don't think that the jiggle pin is important.

A 1994 Toyota Corolla thermostat (fits all Corollas between 1983 to 2001 and 1.3L to 1.8L capacity) will work. Also, the original BMW is unit is 30mm high and the Corolla is 35mm. This is not an issue because when the stem closes the by-pass the assembly pushes against the spring which has a lot of give by design.  There are two temperatures, one 82 °C and the other 89 °C. Experience shows that the 82 °C keeps the water and oil temps steady.

Australian manufacturer:  Tridon TT214-180 fits many, many toyota vehicles including the following: 4runner,  Avante,  Camry,  Celica, Corolla,  Corona,  Dyna, Estima,  Hi-Ace,  Hi-Lux,  Lite-Ace, Mr2,  Rav4,  Soarer,  Starlet,  Supra,  Tarago,  Tercel,  Townace.

For the o-ring you will need see:
http://www.nak.com.au/products/bs1chart.html

For O-rings, you'll want is BS134

Designation   Inside (mm)   Inside (“)   Outside (mm)   Outside (“)   Section (mm)   Section (“)
BS134   47,30   1.7/8" (1.862”)   53   2.1/16"   2.62   3/32” (0.103")

1 7/8” by 3/32” or 47.30mm by 2.62 Grainger #
Tridon TTG47 gasket

Canadian manufacturer: Canadian Tire sells the replacement thermostat and gasket.  The thermostat part number is 7214-180 J/V.  It is a 180°F (82°C) Failsafe design that fails open should the thermostat break:


The corresponding thermostat gasket is Part number 17-4250-2

[wmax351]

The BMW part is a Bypass style thermostat with jiggle pin., 82°C or 89°C, Flange: 48mm, Foot: 27.7mm, Height: 35mm



I don't think that the jiggle pin is important.

A 1994 Toyota Corolla thermostat (fits all Corollas between 1983 to 2001 and 1.3L to 1.8L capacity) will work. Also, the original BMW is unit is 30mm high and the Corolla is 35mm. This is not an issue because when the stem closes the by-pass the assembly pushes against the spring which has a lot of give by design.  There are two temperatures, one 82 °C and the other 89 °C. Experience shows that the 82 °C keeps the water and oil temps steady.

Australian manufacturer:  Tridon TT214-180 fits many, many toyota vehicles including the following: 4runner,  Avante,  Camry,  Celica, Corolla,  Corona,  Dyna, Estima,  Hi-Ace,  Hi-Lux,  Lite-Ace, Mr2,  Rav4,  Soarer,  Starlet,  Supra,  Tarago,  Tercel,  Townace.

For the o-ring you will need see:
http://www.nak.com.au/products/bs1chart.html

For O-rings, you'll want is BS134

Designation   Inside (mm)   Inside (“)   Outside (mm)   Outside (“)   Section (mm)   Section (“)
BS134   47,30   1.7/8" (1.862”)   53   2.1/16"   2.62   3/32” (0.103")

1 7/8” by 3/32” or 47.30mm by 2.62 Grainger #
Tridon TTG47 gasket

Canadian manufacturer: Canadian Tire sells the replacement thermostat and gasket.  The thermostat part number is 7214-180 J/V.  It is a 180°F (82°C) Failsafe design that fails open should the thermostat break:


The corresponding thermostat gasket is Part number 17-4250-2

Good notes. I'm running an 85*c from a 94 corolla in mine. For god sake, keep a thermostat in your bike, at a proper temperature. Too low temps cause engine wear. I think the broken thermostat (stuck open) may have contributed to the premature wear on my old engine.


My bike runs real steady at 200 *f on the freeway. I need to set up a manual fan switch or an extra output on the megasquirt to run the fan when stuck in traffic, etc.

[richsail]

It's fuel injected and has a o2 sensor please don't run them without a thermostat.

 A thermostat is critical to it operating correctly and its critical that it be rated the same as stock. If the engine runs too cold it will not go closed loop and will burn extra fuel. 

Thermostats often will make the engine run cooler then no thermostat. It slows the flow and allows more time for heat to be shed in the radiator.

 Advanced auto parts carries motorcycle tune up stuff. They list the thermostat for $19.

It

thank you for this... i was going to ask JUST this question... someone on here (several in fact) suggested using a "Tridon TT214-180"... ordered it, and it's currently "in the mail"... in the mean time, i'm stuck with the bike apart and needing to drive it.  guess i'll be waiting for the part to arrive :/  oh, and thank all for having this wealth of knowledge.  i'm pretty good with cars, but this bike-stuff is pretty foreign :/  ride safe !


 :falldown:

[rbm]

These bikes are basically 2-wheeled cars, so you should be in very familiar territory.

[F14CRAZY]

I picked up a Toyota thermostat locally...been fine for a few years. Runs 175-180f whether it's 12f or 90f+

[Skunky]

https://www.ebay.com/itm/BMW-K75-Off-1991-BMW-K-75-radiator-thermostat/261701107032?hash=item3cee99fd58:g:S9cAAOSwiCRUjey7&vxp=mtr

[F14CRAZY]

Just go to your local auto parts store and ask for a Stant Superstat # 45758