Thermostat part number or alternative - 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 6 Old 07-13-2013, 05:30 PM Thread Starter
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Thermostat part number or alternative

Hi

Took the bike on a longer run the other day and noticing that it is heating up more than usual when in stop and go traffic. When on the highway seems to be OK.

I drained and flushed the cooling system and took the thermostat out and di tested it. The first time it did not open at all, then I used a screwdriver to see if it was frozen. The spring moved and when I dip tested it again it did not seem to open until the water was close to boiling. I think the spec says it should open at approx 160F.

Has anyone purchased a new thermostat. We do not have a single motorcycle dealer in town but there are a few ATV dealers along with Canadian Tire etc.

Is there a CTC or NAPA part number for the 87 - 07 KLR thermostat?

Thanks
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post #2 of 6 Old 07-13-2013, 07:04 PM
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Don't know of a substitute for the "Genuine Kawasaki Part," garthw; I somehow thought the size was peculiar to the KLR (or maybe including other Kawasaki bikes/ATVs).

160 degrees F. is the nominal opening temperature, but . . . the Thermo-Bob boys have no problem with a 195-degree F. thermostat.

Thus, if your thermostat works around that temperature, and your coolant doesn't boil, I think you can get by with the old part for awhile. As long as the temperature gauge needle stays out of the red block at the far right of the scale, I think you're operating within safe temperature limits.

Wouldn't hesitate to run the old thermostat under those conditions 'til I could get a replacement, myself, but--your call! With a pressurizing radiator cap, circulating water pump, and an operating fan, I think you'll be o.k., for awhile.

(BTW, Clymer cautions against running without a thermostat.)

Last edited by Damocles; 07-13-2013 at 07:13 PM.
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post #3 of 6 Old 07-14-2013, 06:23 AM
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Quote:
Originally Posted by garthw View Post
Took the bike on a longer run the other day and noticing that it is heating up more than usual when in stop and go traffic. When on the highway seems to be OK.
how much is more than usual??

is the fan coming on??

it's normal for the the temp to rise when the airflow across the radiator decreases at stop or slow speed.

2013 KLR650
1994 YZ250
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post #4 of 6 Old 07-14-2013, 11:35 AM Thread Starter
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Thanks for the replys.

Not a real concern, it still runs fine and does not go into the red, just seems to be running warmer at slow speeds that it did before. Taking it on a trip next week so may look to replace the thermo before that but will do the ride even if I don't get one. As there is not a dealer near here I was just wondering if I could go to CTC and get a replacement.
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post #5 of 6 Old 07-14-2013, 12:14 PM
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to me anyway.....

if the temperature gauge is indicating as usual at speed, with sufficient airflow across the radiator.......

and

if the the fan is coming on at the same place on the gauge as it normally would........


i'd say you're cooling system is operating as designed and you're just seeing the higher temperatures at slow speed and stop because of lack of air movement across the radiator.


good luck on your trip

2013 KLR650
1994 YZ250
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post #6 of 6 Old 07-14-2013, 07:52 PM
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I would get a Thermo-Bob upgrade and the you can use an aftermarket thermostat with no problems.

My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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