Oil Leak below Thermobob; weephole - 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 12 Old 01-27-2018, 08:07 PM Thread Starter
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Oil Leak below Thermobob; weephole

Today, after about 25 miles of freeway riding I got to my destination. I took a look at the engine to make sure there nothing was leaking; I recently completed the water pump seal replacement. Everything was good, until I notice some oil looking fluid leaking some where. I traced the source to a weephole below where the Thermobob connect to the engine cyclinder block(?) - not sure of the proper nomenclature.

Any ideas on what this means?

I've attached an image. 1999 KLR650 25k~ miles


Nick
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Last edited by dopfreerain; 01-27-2018 at 08:50 PM.
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post #2 of 12 Old 01-27-2018, 09:56 PM
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I believe that "weep hole" is the drain from the spark plug area well. Did you spill something in there or wash it recently? Probably nothing to worry about.

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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post #3 of 12 Old 01-27-2018, 10:14 PM Thread Starter
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Originally Posted by klr4evr View Post
I believe that "weep hole" is the drain from the spark plug area well. Did you spill something in there or wash it recently? Probably nothing to worry about.
Didn't spill anything, but, when I did change the spark plug it looked like the valve cover was leaking pretty significantly, I guess it's dripping down into the spark plug well and draining out that hole. I guess that means I need to change the valve cover gasket, guess I should check the valves too!
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Last edited by dopfreerain; 01-27-2018 at 10:50 PM.
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post #4 of 12 Old 01-28-2018, 05:52 PM
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We hope you have a 1/4 drive inch pound torque wrench.

Be gentle with the valve cover retainer bolts. 70 inch pounds ONLY. They are stepped, tighter will Not seal better. Possibly need to purchase 4 new seals for the cover bolts & possibly a valve cover gasket.
But I did get over 70,000 miles & 28 years of service out of mine.

100 inch pounds on the cam bearing cap bolts.
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Modify at "YOUR OWN RISK"!

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post #5 of 12 Old 01-28-2018, 08:23 PM
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Quote:
Originally Posted by dopfreerain View Post
Didn't spill anything, but, when I did change the spark plug it looked like the valve cover was leaking pretty significantly, I guess it's dripping down into the spark plug well and draining out that hole. I guess that means I need to change the valve cover gasket, guess I should check the valves too!
Ya, sounds like you have a project to do.

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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post #6 of 12 Old 01-29-2018, 11:40 AM
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- 5) Overtightening of other fasteners; similar to the oil drain plug there are a few other fasteners that cause significant problems if overtightened; the valve cover bolts are one such fastener - the manual calls up 69 inch lbs (NOT ft. lbs!) but Eaglemike suggests 55 in lbs which is a safer value.


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post #7 of 12 Old 02-03-2018, 02:58 AM Thread Starter
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Unfortunately, this is pretty involved and will have to wait. Likely when I get to this point ill pull the rotor off and inspect that chain guides, tensioner etc. at the same time.
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post #8 of 12 Old 02-03-2018, 11:05 AM
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dopfreerain,
I will highly encourage you to check the valve tappet clearance and FIX the Oil Leak!

There is No Need to inspect the cam chain guide under the crankshaft on a 25,000 mile KLR. One can see the forward stationary cam chain guide & the rear movable cam chain guide when looking Down the cam chain tunnel with the valve cover removed.

Are you going to do the Doo-Hickey when you pull the rotor off?
The Engine Balancer Chain, sprockets, guides, and LOCKING lever (Doo-Hickey) are a completely separate System.

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post #9 of 12 Old 02-06-2018, 12:16 AM
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Quote:
Originally Posted by dopfreerain View Post
Today, after about 25 miles of freeway riding I got to my destination. I took a look at the engine to make sure there nothing was leaking; I recently completed the water pump seal replacement. Everything was good, until I notice some oil looking fluid leaking some where. I traced the source to a weephole below where the Thermobob connect to the engine cyclinder block(?) - not sure of the proper nomenclature.

Any ideas on what this means?

I've attached an image. 1999 KLR650 25k~ miles


Nick
How do you like the thermobob mod? I had to read a bit up on it. Makes sense now since I'd ride at like 60 and I thought my temp gauge was broken because of how cool the engine was running.
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post #10 of 12 Old 02-11-2018, 01:21 PM Thread Starter
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How do you like the thermobob mod? I had to read a bit up on it. Makes sense now since I'd ride at like 60 and I thought my temp gauge was broken because of how cool the engine was running.
I'm not sure what it is like without one since I bought it this way. However, if its job is to keep things cooler, I don't want to see the bike without one. It still gets too hot if I run it really hard, i.e. trying to pop wheelies, and then have to stop and some stop lights every 30 seconds for 10 minutes. I will have to turn the bike off at times if sitting at a stop light
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