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Old 09-13-2017, 01:08 PM   #1
boothbay
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Default One more Heating/cooling question

The 02 klr i "new" to me, and trying to get a good understanding of the operations of a healthy KLR.

I have noticed on the few short rides I've done between upgrades, that the temp gauge reads just over the half way mark after riding a few miles or around town. The fan does come on, and maintains the gauge reading.

Based on my other moto's, the heat climbs too quickly and the fan engages way too soon for my understanding of water cooled motorcycle engines.

The engine just feels 'hot' and can def feel the heat as I ride. Is this normal for the 650 thumper?

I've read many threads concerning the cooling system, and haven't flushed or changed the coolant (as I intend to do, being that I don't know the full history of the bike).

I realize that it might be premature to ask, without doing a full system check...thermostat, water flow, ect.
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Old 09-13-2017, 02:38 PM   #2
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Default Re: One more Heating/cooling question

sounds relatively normal to me. ....my belief is that many/most of the "my KLR is running hot" threads are actually about bikes that are working normally. Of course it is possible that you have a bad thermostat, partially plugged rad, running too lean, etc. etc......or not.

Me? my bike never pukes coolant into the overflow that I've noticed and the gauge never gets pegged on the hot side so I don't worry much. .....one solution is to buy a bike without a temp gauge!


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Old 09-13-2017, 09:54 PM   #3
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Default Re: One more Heating/cooling question

yeah...idiot lights are foolproof. You brought up a few possibilities, namely the lean condition of the fuel/air. With the new carb set-up with the 7/64 diaphragm mod and a single shim at the needle, I believe I turned out the air screw 1 3/4 turn. This is all with a 42 pilot (didn't have a 40 when rebuilding the carb). Never had a chance to do a check on the ratio, with the intention of getting to it later, and recently sold my Innovate Motorsports a/F guage.

I'll go through all checks of the cooling system tomorrow and post results.
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Old 09-14-2017, 11:35 AM   #4
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Default Re: One more Heating/cooling question

After a system check, I've determined that all is good. Before I senselessly drained the rad of clean, clear (translucent blue) fluid to give it a thorough flush, I decided on temperature readings of the coolant, first.

After running the bike at idle and watching the temp gauge climb to the just over halfway mark, I checked for the fan to switch. This was done while the cap was off of the rad to check/ensure that the circulation was occurring.

Now, armed with an infrared and a meat thermometer, I let her run again. At first check of the meat thermometer, I go a reading of 68F, which was close to the ambient temp pf the air. Letting it run and watching the gauge, the fan clicked in at 160 and rapidly cooled the temp of the coolant down to 145F. With the infrared, The reading at the engine cylinder was 158F.

Checked the hoses and all seemed to be good, with the lower hose much cooler than the upper. With good circulation, respectable heat range and fan in operation, I'd say all is good. I still want to inspect the thermostat for any blockage, however minor.
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Old 09-14-2017, 12:02 PM   #5
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Default Re: One more Heating/cooling question

sounds good. Regardless of your thoughts on a thermobob, I've found lots of good information regarding KLR cooling on Bill's site: https://watt-man.com/Information__Articles.html

Cheers,
Dave
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Old 09-15-2017, 02:33 PM   #6
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Default Re: One more Heating/cooling question

T-bob and a new larger radiator = no "running hot" issues here in Phoenix. The t-bob has my engine warmed up before I hit the interstate a short distance away, and the fan only comes on only when I'm at a prolonged stop or stuck in traffic. It barely goes past half on the gauge at 85 in 110+ degree weather.

A few bolt-ons and I've got peace of mind with my 19 year old bike.
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Old 09-16-2017, 10:50 AM   #7
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Default Re: One more Heating/cooling question

Quote:
Originally Posted by rjmay3 View Post
T-bob and a new larger radiator = no "running hot" issues here in Phoenix. The t-bob has my engine warmed up before I hit the interstate a short distance away, and the fan only comes on only when I'm at a prolonged stop or stuck in traffic. It barely goes past half on the gauge at 85 in 110+ degree weather.

A few bolt-ons and I've got peace of mind with my 19 year old bike.
For future reference, if needed...where did the radiator come from? Was it aftermarket, or scavenged from another bike? Curious.
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