Coolant Filter/Screen - Kawasaki KLR 650 Forum
Australia Riders down under.

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post #1 of 21 Old 01-19-2018, 01:47 AM Thread Starter
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Coolant Filter/Screen

Hello all - Recently purchased a 2011 KLR 650. I have searched many variations in different forums but I cannot get a definitive result or a straight answer with regard to this.
It has a coolant filter. The only reason I noticed this was when I purchased the bike it was seeping coolant (green stuff) very slowly on top of the starter.
Everything else was looking good so I bought it.
Upon closer inspection it appeared as though the filter housing was cracked, most likely due to vibration and heat fatigue). This bike has 22k klm on the odo by the way. When I called the local Kawasaki dealer (Campbelltown Sydney) he was highly sceptical of it's existence and yet here it is Part No. 16160-1359.
My questions are as follows:
Is this part of the cooling system necessary in Australia? It runs through the base of the carby (an old style Constant Depression design) which are known to freeze up at low temp. Fairly sure there are minimal times in Oz that this is required.
Should I bypass?
What are more experienced mbr's advice?

Thanks in advance
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post #2 of 21 Old 01-19-2018, 02:29 AM
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It can be bypassed with no ill effects. I believe that the carb icing circuit is only on Australian models, which makes me think that the Japanese have some confusion WRT your proximity to the Antarctic.

I, and many other Merkuns and Canadanians, have ridden KLRs in subfreezing weather (wet and dry) and have had no problem with carb icing.

BTW, that pump cover makes for a very good start of a radiator bypass system.

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Last edited by Tom Schmitz; 01-19-2018 at 02:33 AM.
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post #3 of 21 Old 01-19-2018, 09:38 AM
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The "carburetor heat" scheme on Aussie KLR650s may indeed be, "An elegant solution to a non-existent problem." Yet, carburetor icing may occur in ambient temperatures well above freezing (thus sayeth Wikipedia).

Carburetor icing occurs as a function of temperature drop in the venturi and humid air. Not sure whether the temperature drop is mostly from atomization of fuel or from pressure drop. Regardless, carburetors may ice under certain atmospheric and operational conditions.

Water-heated intake manifolds are found on some marine conversions of automobile engines. As an English-as-a-second-language boathouse worker once said, referring to a manifold radiator connection, "That don't cold it, that hots it!"
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post #4 of 21 Old 01-19-2018, 09:42 AM
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The proof is in the pudding IMO; none of our North American bikes have that system and I've yet to hear of a KLR icing up therefore I think it's pretty safe to say that it isn't needed and can be removed. .....arrrrgg, there I go agreeing with Tom again! LOL

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post #5 of 21 Old 01-19-2018, 09:58 AM
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Originally Posted by Tom Schmitz View Post
It can be bypassed with no ill effects. I believe that the carb icing circuit is only on Australian models, which makes me think that the Japanese have some confusion WRT your proximity to the Antarctic.

I, and many other Merkuns and Canadanians, have ridden KLRs in subfreezing weather (wet and dry) and have had no problem with carb icing.

BTW, that pump cover makes for a very good start of a radiator bypass system.
KLRMac,
It truly is a mystery to most of us why the Australian & New Zealand KLRs received the carb de-icing plumbing.
Northern Europe, Canada & Alaska would make more sense.

Yes the portion which goes to and from the carb can be readily eliminated.
But as Tom sort of suggested, instead of just capping, one can connect the thermostat outlet nipple to the water pump inlet nipple, while avoiding the exhaust header.
This will make a radiator by-pass re-circulating system to allow quicker engine warm-up. A larger hose would be Great.

Are you familiar with the Thermo-Bob 2?
Thermo-Bob 2 for KLR650

You could possibly purchase a warmer 90C thermostat over in Oz and have All of the exact same advantages. Quicker warm-up, improved fuel economy, consistent performance, cleaner engine oil.

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post #6 of 21 Old 01-19-2018, 10:07 AM
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Actually Dave, there are some N. American Kawasaki road bikes which Do Use & Need carb heaters.
The VN1500 E series Vulcan Classic comes quickly to mind.

They are temp controlled by the big metal non-filter thingy after the carb, some how.

pdwestman
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Last edited by pdwestman; 01-19-2018 at 10:11 AM.
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post #7 of 21 Old 01-19-2018, 11:40 AM
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The 1st gen Yamaha R6 (carb model) had the same system to all 4 carbs with a mini thermostat inline. On the California only model , the 49 state model did not have it. It was the only way it would pass the CARB emissions testing in Cali. Perhaps there was a similar issue with the Klr down under ?
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post #8 of 21 Old 01-19-2018, 02:50 PM
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Originally Posted by pdwestman View Post
Actually Dave, there are some N. American Kawasaki road bikes which Do Use & Need carb heaters.
The VN1500 E series Vulcan Classic comes quickly to mind.

They are temp controlled by the big metal non-filter thingy after the carb, some how.
Sorry; when I said "bikes" in this context I was only referring to KLR's.

Cheers,
Dave
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post #9 of 21 Old 01-19-2018, 04:48 PM
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I have read a couple of carb icing stories from riders who were caught in the Far North by early/wet storms.
A Bic lighter, Zippo or extended BBQ lighter held under the idle mixture screw area will thaw them out temporarily.

Oliver from BrokenToothProject apparently hasn't had to deal with the issue in his dead of winter rides or has learned how to deal with it.

In the winter time, we used to add a gasoline drier like "HEET" to our fuel, Isopropyl Alcohol I think. So does the use of Ethanol Alcohol reduce or eliminate the need for isopropyl alcohol in the winter?

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post #10 of 21 Old 01-19-2018, 07:40 PM
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HEET dissipates moisture in fuel, functioning as fuel anti-freeze. Carb icing, as I understand it, relates to freezing moisture in intake air.

Ethanol alcohol? Consumed by the rider? Many effects claimed!

Carb icing comprises freezing of intake air moisture, a function of venturi temperature, not ambient temperature. Certainly, venturi temperature likely will be lower with low ambient temperature, but . . . carb icing at ambient temperatures above freezing are possible.

I think maybe an ATV or two exist with water-heated intake manifolds; not sure how "necessary" these accessories might be in our climate zone. Maybe worthwhile in more humid regions.
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