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Old 05-13-2009, 11:04 PM   #286
Zombie_Stomp
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Nice work finding that stuff. I wonder how you found the one that's in a foreign language- none of the words in your search criteria would turn them up in the results! But some things are not lost in translation. Example:

"Jesus man wat een goed proefwerk "

This guy's pretty much got the exact idea I had. I wish I could red his language, it's probably chocked full of good notes on rogue RFVC modifications.
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1983 Toyota pickup: total overhaul, preservation-restoration in constant progress...
1987 Yamaha XT600 2KF (German)
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I do heavy-duty textile repair, upholstery, and design/manufacture bags.

Zombie_Stomp screwed with this post 05-13-2009 at 11:14 PM
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Old 05-14-2009, 12:56 AM   #287
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some things are best left unknown.......
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125cc Salt Racer - God of Speed Thread
'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
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'85 XL600R-L-M-PDGSAZ
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Old 05-14-2009, 06:12 AM   #288
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im wondering why the tensioner is a slider and not a roller? surely there would be alot less wear and tear if a sprocket on an axle on a spring was the tensioner?

also why wouldnt it be positioned closer to half way between the camshaft and the crankshaft rather than so close to the cam? surely if it was more in the middle it could be more controlling of the chain?

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125cc Salt Racer - God of Speed Thread
'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
-
'85 XL600R-L-M-PDGSAZ
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Old 05-14-2009, 07:59 AM   #289
Easy-Z
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Anyone know the size of the nut on top off the steering head? I have 25mm and a 32mm socket. It's somewhere between those.

Thanks!
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Old 05-14-2009, 08:05 AM   #290
mcma111
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Cam Tensioner, Guides

The XR/XRL line of engine have a cam chain tensioner that uses a one way bearing that along with the spring keeps constant tension on the cam chain guide. The tensioner pivot is that chrome piece at the right rear side of the head. There is a lock-pin that keeps it in position relative to the tensioner. The guides (2) are steel that have a rubber type of layer on them. The forward guide is static for the tension side (under load runs stratght and true) of the cam chain travel and the rear is the adjustable side (takes up the slack) for the return side of cam chain travel. Tension is applied at near the upper end of the guide because that is where it fits. No can do mid guide = middle of cylinder. It's not putting a whole lot of tension on the guide, just enough to keep things quiet. Set it + forget it...

My XR needed a cam chain replaced recently as I could not get the cam to time correctly. My son's XRL with 30,000 + miles is still on the OE guides and tensioner as does my XR. Honda has not changed the tensioner as far back to 83 if not longer. I have never seen a guide worn out in all the engines I have worked on. Wear yes, worn out, no.
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Old 05-14-2009, 08:09 AM   #291
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Top Nut

Eazy-Z

30mm
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 05-14-2009, 08:21 AM   #292
badweatherbiker
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Bike is not so easy to start anymore since the decompression lever was hanging up, could it have caused the valve to get "out of spec"?
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Old 05-14-2009, 08:37 AM   #293
Easy-Z
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Quote:
Originally Posted by mcma111
Eazy-Z

30mm
Thanks!

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Old 05-14-2009, 09:42 AM   #294
Pokey66C23
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New to the XL600R

The 83 I just bought fires up on the second kick cold. It smokes a little when it fires off, but not when running. Worn valve guides?

The clock states it has 19,000 miles. Throttle response is good and it idles after firing up.

This motor will be transplanted to a 87. What issues should I look at when I have the motor out on the bench? Any weak areas with this motor?

What kind of compression should I be seeing in a healthy motor?

Looking forward to the relaunch of this fine machine, hopefully in much better condition than when I acquired the pair. Thanks for the help.
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Old 05-14-2009, 10:21 AM   #295
Zombie_Stomp
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Quote:
Originally Posted by Easy-Z
Anyone know the size of the nut on top off the steering head? I have 25mm and a 32mm socket. It's somewhere between those.

Thanks!
The size has always been "pipe wrench" or "whatever SAE socket fits".
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1983 Toyota pickup: total overhaul, preservation-restoration in constant progress...
1987 Yamaha XT600 2KF (German)
STOLEN: RED XL600 in Portland

I do heavy-duty textile repair, upholstery, and design/manufacture bags.
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Old 05-14-2009, 11:29 AM   #296
mcma111
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Quote:
Originally Posted by Zombie_Stomp
The size has always been "pipe wrench" or "whatever SAE socket fits".


HACK
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 05-14-2009, 02:25 PM   #297
Easy-Z
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Quote:
Originally Posted by Zombie_Stomp
The size has always been "pipe wrench" or "whatever SAE socket fits".
I don't have much wrenching experience, but one thing I have learned is:

Get the right tool for the job!

Joel, are you up and running again?
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Old 05-14-2009, 03:35 PM   #298
ZapGuy
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Manual decompression cable

Quote:
Originally Posted by badweatherbiker
Bike is not so easy to start anymore since the decompression lever was hanging up, could it have caused the valve to get "out of spec"?
If my manual decompression cable happens to get knocked around, I'll have trouble getting my 1983 XL600R started.

Sometimes I have to give the cable a little wiggle and tug and reseat it "just right" in the bracket/clamp thingy down at the engine end. On mine, it seems to be held in there only by the tension of the cable itself. The metal end of the cable can pop out of the bracket, pulling the insides of the cable just far enough to mess things up.

It's happened often enough that it's now one of the things I check as part of my startup voodoo.
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Old 05-14-2009, 03:48 PM   #299
badweatherbiker
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I adjusted the controls on my handlebars and it all went south from there.
I'll check to see if it still binding, it won't strt with the decomp lever now, have to start it old school.
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Old 05-14-2009, 04:07 PM   #300
Zombie_Stomp
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Quote:
Originally Posted by Easy-Z
I don't have much wrenching experience, but one thing I have learned is:

Get the right tool for the job!

Joel, are you up and running again?
Yeah man, see you tonight?
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1983 Toyota pickup: total overhaul, preservation-restoration in constant progress...
1987 Yamaha XT600 2KF (German)
STOLEN: RED XL600 in Portland

I do heavy-duty textile repair, upholstery, and design/manufacture bags.
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