Running hotter after Thermbob install - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

 
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post #1 of 7 Old 05-12-2015, 07:30 PM Thread Starter
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Join Date: Mar 2015
Location: Newhall Ca
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Running hotter after Thermbob install

I put the thermo bob on my 04 ( which had 1200 miles on it when I installed thermo bob) and have been watching the temp gauge. Before I installed Thermo Bob the bike had very wide temp swings. Just like my Honda 250 scooter. Which is the reason I installed it. When riding it went from the coldest point on the gauge to mid level and the fan would kick on, never really going above the 1/2 way point. Now that I installed the thermo bob the temp is at 1/4 but the high is now above 1/2. When the weather is cool it is stable between 1/4 and 1/2. This week it went to between 5/8 and 3/4. This was while I was riding on the freeway 35 min at 4500 rpms, 83 degrees and about 60% humidity. When I got off the freeway and riding much slower the bike cooled to 1/2 way. I'm wondering if the system is leaking somehow or in someway is not getting pressurized. I don't have any signs of a coolant leak. I'm afraid of how hot it will get in the summer riding on trails or a long trip on the freeway when it's 100 degrees.

Any thought's

Thanks
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post #2 of 7 Old 05-12-2015, 07:52 PM
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Surfdaddy,
I'm pretty sure all is WELL. The Thermo-Bob / Thermo-Bob 2's WHOLE REASON for being invented is because, Stock and Standard the KLR650 runs TOO COLD!
Even in Phoenix, AZ. where it was invented.

Just under 1/2 to 3/4 gauge is Great! No need to fret unless the gauge go's Beyond, 15/16ths of the hot zone. Which I doubt it will in normal riding, unless you bend/damage the fan or fan support or the radiator itself.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #3 of 7 Old 05-13-2015, 01:02 PM
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Join Date: Nov 2014
Location: North Central Washington State
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Surfdaddy, I installed a Thermobob 2 on my '07 last year, and the readings pretty much mimic yours. Mine goes past center, maybe even to 3/4 up in the steep mountain roads. I don't worry about it. As long as the fan works, everything's cool....well maybe not.

John
'07..The red and silver one. (they go faster)
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post #4 of 7 Old 05-13-2015, 06:25 PM
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A higher-temperature thermostat should result in higher operating temperatures, I should think.

While the Thermo-Bob does nothing to enhance cooling (with open thermostat, the engine is at the mercy of unchanged coolant and air flow, Thermo-Bobbed or not), but does cooling no harm, either.

Fear not, Surfdaddy!
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post #5 of 7 Old 05-13-2015, 06:38 PM Thread Starter
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I think I may have a very slight leak. After parking the bike there is no signs of leaks but as the bike cooled and set over night there is a dribble of coolant on the mat under the bike. I'll check to see if one of the hoses are not seating properly. There is some coolant at the base of the case but not any drops or leaking while its running or hot. Since I didn't touch anything other than the hoses I'm suspect on how the hose is clamped, though it looks like it's on correctly. Having a leak, even though it's not letting coolant out will not allow the system to pressurize and cause the system to get hotter.
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post #6 of 7 Old 05-13-2015, 07:42 PM
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Quote:
Originally Posted by Surfdaddy View Post
Having a leak, even though it's not letting coolant out will not allow the system to pressurize and cause the system to get hotter.
Hardly, I think, Surfdaddy!

The purpose of a pressurized radiator is to ALLOW super-heated coolant temperatures; that is, temperatures above the atmospheric pressure boiling temperature.

Without a sealed radiator, pressurization cannot occur, resulting in boiling of the coolant at a lower temperature than would be achievable with liquid-state coolant under pressure.

A miniscule coolant leak may be of no significant consequence, IMHO (that's what weep holes are for); YMMV!
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post #7 of 7 Old 05-13-2015, 07:46 PM Thread Starter
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I'll check the hoses and see what happens. Kind of weird not to have any signs of a leak until the bike sits and is completely cooled.
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