Do I need a thermostat? - Wrist Twisters
 
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post #1 of 13 Old 09-15-2015, 05:31 AM Thread Starter
Cornicen
 
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Do I need a thermostat?

When riding my 9er to work this morning, about 20 mins into the ride, my engine temp needle was still on C, it came up to the middle once or twice during the ride, but spent most of the time on C.

I had the thermostat replaced when I bought the bike two years ago and everything was fine.

Just wanted to know if that is a thermostat problem, and if so, is that something I need to replace quickly?

Will I do any damage if I continue to ride?

Thanks

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post #2 of 13 Old 09-15-2015, 06:44 AM
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It sounds like normal operation for the stock thermostat. Rarely gets much over the C mark unless it's really hot outside or sitting at stoplights.

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post #3 of 13 Old 09-15-2015, 06:57 AM Thread Starter
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It has been so long since I've been able to take it out, but I thought I remember it getting up to temp and staying around the middle when riding normally.

Bikes:
2004 V-Rod (sold)
2004 CBR600F4i (sold)
2003 RC51
2010 Triump Scrambler (sold)
2003 CB900F
2004 CBR 600rr

Non Bikes:
2007 JK Sahara
2005 CTS V (sold)
2006 Audi S4
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post #4 of 13 Old 09-15-2015, 07:14 AM
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Mine usually just goes up to the notch just off cold and stays there unless I'm sitting in traffic then it climbs to just about halfway +/- up the incredibly accurate gauge


Dan
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post #5 of 13 Old 09-15-2015, 07:31 AM
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I agree w/ those that say it seems normal.
But if you have concerns, and want to do something to check it out, it's really easy to remove the thermostat w/ the 919. You can then check it's operation in some hot water and a cooking thermometer on the stove - see when it starts to open and when it's fully open. Kind of fun - like a science experiment - and it will tell the story.

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post #6 of 13 Old 09-15-2015, 12:06 PM
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Mine sits barely above cold unless I am stopped. It is more proof to how under-stressed the 919 motor is.

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post #7 of 13 Old 09-15-2015, 07:53 PM Thread Starter
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Maybe I am just remembering incorrectly. On the ride home I watched it more carefully and the behavior was right in line with what everyone was saying. Tending to get hotter when stopped at lights, and then would drop again when moving.

Thanks for all the feedback, made me feel much better.

Bikes:
2004 V-Rod (sold)
2004 CBR600F4i (sold)
2003 RC51
2010 Triump Scrambler (sold)
2003 CB900F
2004 CBR 600rr

Non Bikes:
2007 JK Sahara
2005 CTS V (sold)
2006 Audi S4
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post #8 of 13 Old 02-17-2016, 07:25 PM
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I did a 300 miler the other day and noticed (1) my temp gauge never budged and (2) my gas mileage plummeted to 29mpg. The outside temp was in the 30's and 40's but the gauge used to read maybe 25% even on colder days. I let the bake sit and after a few minutes the gauge did move up a bit. After a few more minutes the fan did come on. Do you guys think I should just try a warmer thermostat of could it be the temp sensor?
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post #9 of 13 Old 02-18-2016, 12:52 AM
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With gas mileage dropping, I'd be tempted to try a warmer thermostat, to let the ECU know the coolant temp is up and so the mixture can be leaned off.

But if yr temp sensor is off, that's not going to help. Can't see a way to get good data; might have to try a sequential series. You've done old thermostat old sensor, so next it might be new thermostat old sensor, then new sensor if you don't get a change.

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post #10 of 13 Old 02-19-2016, 07:46 AM
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Quote:
Originally Posted by jmdavis984 View Post
Mine sits barely above cold unless I am stopped. It is more proof to how under-stressed the 919 motor is.
Yes, the919 engine is a mild power output design.
The cooling system is interesting.
It's a higher volume X lower heat rejection area design.
In other words, more coolant volume with smaller rad area.
For what the 919 is, how Honda wanted the package to look like and envisioned it to be used, that's A OK.
Having said that, a 919 up to full temperature and under full power for significant periods of time can start to "run out of rad", especially if the air is thin and very dry.
This is more of an issue for dyno work than anything else, in other words, good dyno work for 919s is reliant upon the tuner monitoring and controlling the coolant temp.

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post #11 of 13 Old 03-25-2016, 08:10 PM
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Ya think?

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post #12 of 13 Old 03-25-2016, 08:28 PM
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The parts house guy and I matched up a 180 thermostat for a '90 model Suzuki Swift. The only other option was 195 so I stayed with the stock spec.



Close but no cigar. I still had to knock out the two outer tabs. I just stuffed a shop rag in the opening and gently tapped them with hammer and chisel and they came right out.

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post #13 of 13 Old 03-28-2016, 11:55 AM
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Problem solved. 40.83 mpg.
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