OIL Screen and gummy worms - 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 20 Old 01-25-2014, 02:50 PM Thread Starter
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OIL Screen and gummy worms

I've seen pics of oil screens nearly blocked by gummy worms. So I've been feeling guilty about not checking.


There were two very thin gummy worms, some hard black plastic, and a small amount of metal. I can't see them in the photo, but there are also 3 flecks of the "Copper High-Temperature" RTV sealer that I use on the left of the valve cover gasket.

My first feeling was relief that the oil gets through OK. Then I started wondering about the source of that hard plastic. Radiuses more like an O-ring gone hard and square instead of bits of the end of a cam-chain guide.

But I'd seen pics with warnings to check. I thought I'd post a pic of a mostly-clear screen. (But if yours has big thick gummy worms you'll be sorry.)
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post #2 of 20 Old 01-25-2014, 03:33 PM
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Ya it's actually amazing what those little screens will pick up.


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 20 Old 01-25-2014, 04:37 PM Thread Starter
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I sure like the looks of mine better than I like the looks of yours. Good YOU checked.

Your pic also shows black things. Do you recall if they were hard or soft?

Is there a common source of hard black bits at the oil screen? Dangerous or benign?
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post #4 of 20 Old 01-25-2014, 05:51 PM
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Grinnin,
The most likely source of the 'hard rubber' bits is, rubber noise damper material. From the engine balancer sprockets.

Have you ever physically / visually checked your Doo-Hickey and its related parts?

Is your doo-hickey 'stone stock' or Eagle Manufacturing?

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post #5 of 20 Old 01-25-2014, 07:38 PM
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I'm gonna clean mine and make a bass jig. KLR style (extra zip ties).




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post #6 of 20 Old 01-25-2014, 09:34 PM
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I should probably do this one of these years........



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post #7 of 20 Old 01-25-2014, 11:21 PM
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Not as many worms as I usually see so the assembler must have had sore fingers and couldn't squeeze the dispenser as hard as usual.

Don't know the source of the black bits either but are also typical. I've always considered that they are the result of initial break in of the rubber backing on the chain guides. Most of the rubber faced guides shed rubber until the chain side links chew into the rubber far enough that the chain runs on the rollers.

It's amazing how much stuff can sit in some of the screens but am not aware of any problems arising. Not something about which to be concerned, IME. I pulled the side cover on a friend's KLR to ...can't recall...clutch plates? Anyway, it had about 80,000 miles and screen full of worms and rubber bits. He rode it for a long time after that and far as know is still going with a new owner.
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post #8 of 20 Old 01-26-2014, 01:10 AM
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Quote:
Originally Posted by Grinnin View Post
I sure like the looks of mine better than I like the looks of yours. Good YOU checked.

Your pic also shows black things. Do you recall if they were hard or soft?

Is there a common source of hard black bits at the oil screen? Dangerous or benign?
I don't recall the exact make up of hard and soft bits but it was a combo. That picture is from a few years back. I wonder what it looks like in there now but I'm not curious enough to take it apart.

Anybody ever check the oil screen twice?? and find a lot of stuff the 2nd time??

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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Last edited by klr4evr; 01-26-2014 at 01:34 PM.
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post #9 of 20 Old 01-26-2014, 07:34 AM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Grinnin,
The most likely source of the 'hard rubber' bits is, rubber noise damper material. From the engine balancer sprockets.

Have you ever physically / visually checked your Doo-Hickey and its related parts?

Is your doo-hickey 'stone stock' or Eagle Manufacturing?
A damper could be the right diameter, but it couldn't be as thick as, for example, the damper on the stock countershaft sprocket, unless the surface hardens and flakes off while there's still more rubber underneath. Looking at the longest of them the curve suggests a radius of 30-40cm or 1.25-1.5" (as near as I can guess from a short piece). The ones in 4evr's pics show some similar radius.

It's slivers. I've seen old cam guides and tensioners chunk off in the past. Not the same.

I physically checked the doo when replacing the stocker with an EM doo and tortion spring. I physically checked the cam chain tensioner and guide when I put in the 705 cylinder and piston. That was 22,000 miles ago, about 16 months.

Last edited by Grinnin; 01-26-2014 at 07:55 AM.
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post #10 of 20 Old 01-26-2014, 07:42 AM Thread Starter
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Quote:
Originally Posted by klr4evr View Post
Anybody ever check the oil screen twice?? and find a lot of stuff the 2nd time??
Good question and someone may pipe up.

I checked only because I don't want oil-starved bearings. Three reasons I'd look again are: 1) something comes apart and could clog the screen, 2) clutch worn out, 3) need work farther in (trans or crank). Since I keep the RTV thin and toward the outside I'm not worried that what I apply will clog the screen. (On another forum this'd probably be quoted as "KLR owners are too cheap to use sufficient RTV".)
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