Author Topic: "Normal" temperature on gauge  (Read 426 times)

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Offline Bham Greg

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"Normal" temperature on gauge
« on: May 08, 2018, 12:50:58 am »
Recently purchased 98 ZG1000 and the temperature gauge rarely goes above cold. I suspect there is a bad thermostat (or previous owner removed it). But in searches on COG it sounds like it is a real pain to remove the thermostat housing. Before I go to the effort, where should the needle fall on a warmed up bike? And does this sound like thermostat should be replaced?

Offline Harry Martin

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Re: "Normal" temperature on gauge
« Reply #1 on: May 08, 2018, 12:56:13 am »
Well, mine reads about 1/4 to 1/2 way after good and warm.

I opened mine once by draining the coolant, remove the valve cover, spread a towel across the valves to catch any remaining coolant.
Undo the appropriate hardware. It drops down, then you can fold it forward. Actually not that bad to do, just have to be patient.
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Offline Bham Greg

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Re: "Normal" temperature on gauge
« Reply #2 on: May 08, 2018, 01:03:50 am »
Perfect. Thank you.

Offline CRocker

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Re: "Normal" temperature on gauge
« Reply #3 on: May 08, 2018, 03:09:27 am »
Could be “Coolant Cocktail”...a special blend of coolant...my C-10 has CC and the needle barely moves...

Offline Bham Greg

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Re: "Normal" temperature on gauge
« Reply #4 on: May 08, 2018, 08:10:38 pm »
and the needle barely moves...

So in your case the needle is always at 'C'? Maybe that is 185 F (or whatever the thermostat is set to.) My concern is that my engine isn't running hot enough to be efficient. It only goes up when I'm sitting at idle, and only to about 1/3. Admittedly I haven't had the bike out on a hot day yet.

Offline VTconnie

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Re: "Normal" temperature on gauge
« Reply #5 on: May 08, 2018, 10:52:28 pm »
and the needle barely moves...

So in your case the needle is always at 'C'? Maybe that is 185 F (or whatever the thermostat is set to.) My concern is that my engine isn't running hot enough to be efficient. It only goes up when I'm sitting at idle, and only to about 1/3. Admittedly I haven't had the bike out on a hot day yet.

Haha, yes this is a concern of mine as well. In the cool morning commutes in NE I had my radiator blocked off with cardboard, to keep the temps up. I also have her juiced a little and runs rich until things warm up, including the weather.

The temp gauges are subjective, and vary from bike to bike electrical conditions, you should do the "Free Power Mod" to improve the grounding if you haven't already. I consider the temp needle moving just to the right side of the initial white space, to be 'warmed up'. Fan should kick on half-way, and keep it roughly around there. If the needle goes all the way to the right of the gauge, you may start to smell coolant burping up.
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Offline Bob H

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Re: "Normal" temperature on gauge
« Reply #6 on: May 08, 2018, 11:02:01 pm »
An IR thermometer would tell you how warm the engine is actually getting.  That would show whether or not your thermostat is present and/or working properly.
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Offline MAN OF BLUES

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Re: "Normal" temperature on gauge
« Reply #7 on: May 08, 2018, 11:04:24 pm »
Well, mine reads about 1/4 to 1/2 way after good and warm.

I opened mine once by draining the coolant, remove the valve cover, spread a towel across the valves to catch any remaining coolant.
Undo the appropriate hardware. It drops down, then you can fold it forward. Actually not that bad to do, just have to be patient.

Ummmmmmm Harry? You feeling ok?


I think you are talking about the radiator... thermostat housing is in the back...mmmmkayyyy.....

As for removing it.. all I can say is, if you like to curse, and drop stuff, and become very angry, then don't pull the carbs, and the single bolt holding the thermo tube in place, and try to remove the 3 screws from the top of the housing, cursing, only to find the big housing oring is mush, and you will end up pulling carbs to get it out easily, to clean and repair the housing for the new seal, and o ring.. and the smaller o ring on the down tube...


Happy times, think nice thoughts...

30 YEARS OF KAW.....Rich R. (the other one..)  COG 5977  JUSTAMEMBAHNOW

Offline Harry Martin

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Re: "Normal" temperature on gauge
« Reply #8 on: May 08, 2018, 11:05:57 pm »
Well, mine reads about 1/4 to 1/2 way after good and warm.

I opened mine once by draining the coolant, remove the valve cover, spread a towel across the valves to catch any remaining coolant.
Undo the appropriate hardware. It drops down, then you can fold it forward. Actually not that bad to do, just have to be patient.

Ummmmmmm Harry? You feeling ok?


I think you are talking about the radiator... thermostat housing is in the back...mmmmkayyyy.....

As for removing it.. all I can say is, if you like to curse, and drop stuff, and become very angry, then don't pull the carbs, and the single bolt holding the thermo tube in place, and try to remove the 3 screws from the top of the housing, cursing, only to find the big housing oring is mush, and you will end up pulling carbs to get it out easily, to clean and repair the housing for the new seal, and o ring.. and the smaller o ring on the down tube...


Happy times, think nice thoughts...

Yup. Done it. Quite sane. It works.
Harry in Wild and Windy Casper, WY - 1986 Vintage "Silverdammit" - 2015 "Greendammit"
Freelance Cartoonist & Illustrator: Road Rash Cartoons

Offline MAN OF BLUES

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Re: "Normal" temperature on gauge
« Reply #9 on: May 08, 2018, 11:11:01 pm »
Ok.


 :TPIWWP:

30 YEARS OF KAW.....Rich R. (the other one..)  COG 5977  JUSTAMEMBAHNOW

Offline VTconnie

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Re: "Normal" temperature on gauge
« Reply #10 on: May 08, 2018, 11:37:28 pm »
Everything is shoe-horned into these bikes, almost as bad as my Honda.
<--2003 Concours C-10 "Conifer", -AKA- The Cruise Missile
1980 CB900C DOHC "Old Iron" -AKA- The Hill Climber                

Offline Harry Martin

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Re: "Normal" temperature on gauge
« Reply #11 on: May 09, 2018, 03:19:40 am »
Ok.


 :TPIWWP:

Sorry, didn't take pics. It was right after I installed my carbs. When I discovered the leak, I decided I was not gonna remove the carbs even if it cost me my fingers. I'd do it again. I do recall I had to make a tool to get into a tight space to get the small bolts out. The towels kept stuff from falling into the engine.

After finishing I thought, that wasn't so bad. Yes, I'd do it again.  :great:
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Offline Bham Greg

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Re: "Normal" temperature on gauge
« Reply #12 on: May 10, 2018, 12:43:50 am »
Thanks all! Good idea Bob H to take an IR thermometer to it. I'll start there.