No thermostat..?

[A100man]

Suspect the FZ has no or broken thermostat fitted as the temp needle hardly ever moves off the bottom. In hot weather recently it nudged up a bit but not much..


My suspicion is that there's no thermostat in the housing.. (I'll have a look soon as I also want to dismantle parts to balance the carbs) But..how bad is this generally? i.e. what are the downside of not having one. Obvs it's not running at optimum temp for much of the time.

Cheers
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[MarJay]

If it was broken it was more likely to be broken shut than broken in an open position. Could it be an issue with the temperature sender rather than the stat? I'd definitely recommend inspecting, and then testing the stat using the Haynes classic water in a pan on the hob method.

The other option is just to see if the rad is getting hot. If not it could be the stat is shut or it could be an air lock in the cooling system.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Nobby the Bastard]

No stat is a quick and easy fix for a broken stat. There wasn''t in my FZR and I used it in all kinds of weather without an issue.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[that_impulse_guy]

my jap ('86 carb, 4T) import doesnt have a stat.

its not there.
there is a holder for it, but its empty.

it came empty from the factory...so did every other one of these ones.
Mine is not unique.
The microfiche shows the stat holder, but there is no stat drawn/shown, and no part number for it either.

I dont know what I'm proving, come to your own conclusions
____________________
Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R

[MCN]

[WD Forte]

Quick gauge test
short the sender wire to the engine when the ignition is on
and the needle should climb to max.
If it does, the gauge is OK
To test the sender
measure it's resistance to ground at cold/ambient (20C)
as the engine warms up the resistance should drop
____________________
bikers smell of wee

[stinkwheel]

You could bodge the bodge and cover part of the radiator with a bit of for sale sign board. I've actually seen it done for running over winter with bikes that had the 'stat removed because they overheated in town in the summer.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[slowasyoulike]

[A100man]

[A100man]

[lingeringstin...]

Every car and bike I've ever owned that was water cooled got the thermostat immediately chucked out and in several decades I have never had the least bit of issue with it. Yes I know there might be some sort of "optimum" temperature for highly tuned race engines to run at but in real daily use of average vehicles nothing requires a thermostat other than so your car's heater heats up quicker in the winter.

Most engines even today are still not rocket science. Fuel leaks into the engine through a hole and then goes bang under pressure and the piston runs away in terror, then it comes back again for more. This repeats itself many times and as a consequence the shaking of the engine causes gravity to recede in front of you and the vehicle gets pulled along by magnetic force as if it's perpetually going downhill. When you switch off the ignition the piston stops being frightened and the gravitational field around the vehicle returns to normal.

Well that's one of my theories anyway. I've got others.

[weasley]

[quote="lingeringstink"...but in real daily use of average vehicles nothing requires a thermostat other than so your car's heater heats up quicker in the winter.[/quote]

And your engine heats up quicker, meaning it is running more optimally more quickly. Most wear happens during warm-up, when the parts aren't the right size and the oil is not fully woken up. More recently this is also to help with vehicle emissions and efficiency.
____________________
Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[MCN]

[WD Forte]

I always piss in my coolant when topping it up to
purge noxious vapours and evil fluxes lest a menstruating woman
has cursed it by passing by with out a veil
You cant be too careful
____________________
bikers smell of wee

[MCN]

[virus]

[MCN]