KLR cooling question - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 30 Old 06-30-2012, 06:16 PM Thread Starter
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KLR cooling question

2011 KLR
How much difference do the leading edge slots, in the stock skid plate, make in cooling the bike?

I'm making an aluminum skid plate, and would like to know if I should put vent holes in the leading edge. ( Part directly behind the front wheel.)

The original one has several large slots.

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2017 Yamaha XT250
1990 Honda NX250 (Green/White)
2011 Kawasaki KLR 650 (Orange & White )

My KLR Page..http://www.powers31.info/2011_KLR650.htm

Mod's to KLR:
Power socket, L.E.D. Battery Indicator, Camera bag holder
Custom Saddlebag frames .
Louder horns, Firstgear Onyx tail bag.
Custom Aluminum Skid Plate.
Cut down seat with Custom pad.
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post #2 of 30 Old 06-30-2012, 08:05 PM
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Little to none, IMHO.

The liquid-cooled engine depends primarily upon its water pump and radiator airflow for cooling; airflow about the un-finned engine cases isn't a greatly significant factor, IMHO; I'd expect about the same heat exchange from the air space between an unvented bash plate and engine case.

Conjecture only; no test data; and . . . YMMV.

Wouldn't sweat the bash plate vents myself, but . . . your bike!
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post #3 of 30 Old 06-30-2012, 08:32 PM
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I remember reading somewhere, maybe while I was researching the Thermal Bob, about testing the bike temps with and without skid plate. Bike runs cooler without it, so I would think the slots in the stock plate are no accident. I chose to mill some in the plate I built, for just that reason. Check out my build thread. http://www.klrforum.com/showthread.php?t=12001&page=2
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post #4 of 30 Old 06-30-2012, 09:14 PM
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Quote:
Originally Posted by CraigES View Post
I remember reading somewhere, maybe while I was researching the Thermal Bob, about testing the bike temps with and without skid plate. Bike runs cooler without it, so I would think the slots in the stock plate are no accident. I chose to mill some in the plate I built, for just that reason. Check out my build thread. http://www.klrforum.com/showthread.php?t=12001&page=2

Without a Thermo-Bob a Gen 2 never warms up!

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #5 of 30 Old 06-30-2012, 09:26 PM
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Didn't mean to drag the Thermal Bob into this. Clarification, bike runs cooler without skid plate.
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post #6 of 30 Old 06-30-2012, 09:47 PM
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Didn't mean to drag the Thermal Bob into this. Clarification, bike runs cooler without skid plate.

I was just making a comment that the Gen 2 never warms up. No need to cut vent holes in the skid plate. I don't have a Thermo-Bob on my 08. It has never gotten more than about a 1/3 way up on the temp gauge and I live in the Mojave desert!

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #7 of 30 Old 06-30-2012, 09:59 PM
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Quote:
Originally Posted by Spec View Post
I was just making a comment that the Gen 2 never warms up. No need to cut vent holes in the skid plate. I don't have a Thermo-Bob on my 08. It has never gotten more than about a 1/3 way up on the temp gauge and I live in the Mojave desert!
Now I understand what your saying. My bike does get quite a bit hotter than yours, usually when I'm putting around town, or sitting at traffic light.
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post #8 of 30 Old 07-01-2012, 12:53 AM
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Mine will warm up too when I am at a standstill. It cools off quick as soon as you get it going.
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post #9 of 30 Old 07-01-2012, 04:41 AM
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Quote:
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Without a Thermo-Bob a Gen 2 never warms up!
Interesting premise!

A "definition of terms" would be useful in discussing the concept.

What does, "warm up," mean? I've observed KLR's (without Thermo-Bobs) heat coolant to the point the radiator fan activates. Doubtless, the higher-temperature of the Thermo-Bob thermostat results in higher average coolant temperatures, but . . . what are the maintenance and service life effects (e.g., addiional miles before major overhaul, additional operational hours without malfunction) of the higher operating temperature?

After thermostat opening, seems to me the bike depends principally upon the water pump circulation and radiator airflow for cooling, with or without a Thermo-Bob. Yet some users believe the Thermo-Bob itself enhances cooling, and they are comforted by higher and more stable coolant operating temperatures.

Do slots for air passages in the bash plate enhance cooling? Yes, but to what extent (oil/coolant temperature difference) and with what reliability and durability consequence, if any? Regardless, cut 'em if you want 'em; anyway, the aesthetic effect of slots is pleasing.

Similarly, the Thermo-Bob, from many accounts, is well-made, competently designed, extensively tested, responsibly marketed and performs as advertised. The device's correspondence to bash plate slots remains unknown.
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post #10 of 30 Old 07-01-2012, 06:02 AM Thread Starter
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Skid plate

Thanks all!

I think I'll leave it ( w/o slots ) for a while and just keep an eye on it, while I ride in our summer temp's. I can always remove it in a minute if I think it's causing over heating.

I like the smooth frontal surface. It helps to keep "crap" from the front of the engine. I can always add holes or slots later.

Quote:
Originally Posted by CraigES View Post
I remember reading somewhere, maybe while I was researching the Thermal Bob, about testing the bike temps with and without skid plate. Bike runs cooler without it, so I would think the slots in the stock plate are no accident. I chose to mill some in the plate I built, for just that reason. Check out my build thread. http://www.klrforum.com/showthread.php?t=12001&page=2
CraigES
Your plate looks like a factory job. How did you get the smooth, rounded corners? Very well done!!
You mentioned "Power Coating" your plate. Is power coat available in , like a spray can? If so, where do you get it?

Ageing Gracefully



2017 Yamaha XT250
1990 Honda NX250 (Green/White)
2011 Kawasaki KLR 650 (Orange & White )

My KLR Page..http://www.powers31.info/2011_KLR650.htm

Mod's to KLR:
Power socket, L.E.D. Battery Indicator, Camera bag holder
Custom Saddlebag frames .
Louder horns, Firstgear Onyx tail bag.
Custom Aluminum Skid Plate.
Cut down seat with Custom pad.
Go Pro Camera mount.
Doo-Hicky
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