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Old 08-12-2012, 01:02 PM   #6001
Mopowa
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Pete,
Glad to hear that you have some sort of resolution to your problem. Sorry that it means more money out of your pocket, but like Bruce says, it'll be worth it. I can't help you on the "A" vs. "AC" motor designation. It never came up during my rebuild, so hopefully it won't be an issue for you either. Do you have a machine shop you trust to do the possible bore and valve job? Feel free to PM me for any specifics on your rebuild. I have a good amount of pics(internal engine and others) from my rebuild that I can post for you if you run into anything. That's one thing that saved me from time to time, was having a picture of how something was before I tore it apart. If you have a cheap camera, it's nice to have it sitting on the workbench with you.

Jeb aka Mopowa
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Old 08-12-2012, 05:26 PM   #6002
lookfar
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Quote:
Originally Posted by Moparmanpete View Post
I still have to get the micrometers out but, what do you all see????
Ignor the head gasket I took it off for inspection and put it back on upside down

Pete
I don't suppose that you did a wet compression test?
To see if it were the rings or the valves that were the problem?
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Old 08-12-2012, 05:36 PM   #6003
lookfar
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Quote:
Originally Posted by Moparmanpete View Post
Nope, didn't know any better
Oh well, never mind.
Now, you need to pour a little fuel into each port, one at a time, both intake and exhaust. Check on the other side for wet spots.
This will tell you whether you have leaky valves or not.
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Old 08-12-2012, 05:42 PM   #6004
lookfar
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For future reference, might be telling some people here how to suck eggs, but to carry out a wet compression test, it is virtually the same as a normal compression test, except that a little oil (5-10mls or so) is added on top of the piston. This will seal the rings, so that if the compression now rises, the rings are the problem, if the compression doesn't rise, it is the valves.


HTH
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Old 08-12-2012, 06:25 PM   #6005
lookfar
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Originally Posted by Moparmanpete View Post
Aha! makes sense!

Well I just checked the valves, right side intake and both exhaust valves are leaking fast!
Well I feel alittle better anyway! Thanks LOOKFAR

Any way to check the rings?
No worries Pete, Glad to be able to help out from the other side of the world.

As for checking the rings, not really, but it has been in my experience with car engines, that once you rebuild either the top end or bottom end, the other end shits itself not long after.

I would be pulling the barrel off and treating it to a light hone, and a new set of rings as a minimum, seeing as how you have pulled it to bits this far.

Wouldn't want to have to do it again so soon.
Much better to be riding.

Stu

PS: havve a close look at your valves when you pull them out, you might be able to lap them in again with a bit of valve grinding paste....but this depends on how they look. Still, worth a shot.

http://www.ebay.com/itm/CHEMICO-Valv...466656&vxp=mtr
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lookfar screwed with this post 08-12-2012 at 06:35 PM Reason: add stuff
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Old 08-12-2012, 06:48 PM   #6006
mcma111
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My normal approach to an engine top end freshen up is send the head out for a valve job and new guide seals. No playing around with lapping compound. Cut it!

Have the cylinder honed and then measure it to see if the piston is still serviceable. If yes then a set of new rings If not then go up to the next size piston.

Don't half ass it. Do it once and do it right.
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Old 08-12-2012, 07:05 PM   #6007
mcma111
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If you need machine work done send it to:

http://www.enginedynamics.com/

It's worth it.
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BMW's
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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 08-14-2012, 06:31 PM   #6008
gravelchewer
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resleeve??

If anyone can help with this it would be awesome...Iam trying to get correct info on if a 85 xl600 needs to be re sleeved to take a 101mm or a 102.4 piston nobody up this way seems to be able to tell me. I thought I read it a way back that they didnt require resleeving to take the larger piston.
Thanks guys
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Old 08-14-2012, 06:34 PM   #6009
twiggie93
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Hey ever one, so I'm finishing up my engine rebuild and I can't figure out the trick to putting on the timing chain I've looked at the manual and everything, I know how to do it I just can't seem to make it happen. any advice or tips is much appreciated thanks O and its a 83 xl600r
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Old 08-14-2012, 06:55 PM   #6010
brucifer
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Quote:
Originally Posted by gravelchewer View Post
If anyone can help with this it would be awesome...Iam trying to get correct info on if a 85 xl600 needs to be re sleeved to take a 101mm or a 102.4 piston nobody up this way seems to be able to tell me. I thought I read it a way back that they didnt require resleeving to take the larger piston.
Thanks guys
Nope. Just bore it. No re-sleeving required.
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Old 08-14-2012, 06:59 PM   #6011
mcma111
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Quote:
Originally Posted by twiggie93 View Post
Hey ever one, so I'm finishing up my engine rebuild and I can't figure out the trick to putting on the timing chain I've looked at the manual and everything, I know how to do it I just can't seem to make it happen. any advice or tips is much appreciated thanks O and its a 83 xl600r

PM sent
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BMW's
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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 08-14-2012, 07:15 PM   #6012
gravelchewer
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Quote:
Originally Posted by brucifer View Post
Nope. Just bore it. No re-sleeving required.
Awesome thanks mate, I thought so but wanted someone else to verify
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Old 08-14-2012, 07:44 PM   #6013
gravelchewer
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Has anyone heard of the wiseco 104.7mm piston for the xl600... wow thats a 5 mm re bore ...is this a good choice?
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Old 08-14-2012, 08:48 PM   #6014
mcma111
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Originally Posted by gravelchewer View Post
Has anyone heard of the wiseco 104.7mm piston for the xl600... wow thats a 5 mm re bore ...is this a good choice?

Never heard of that one.

102.4 Wiseco
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BMW's
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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 08-14-2012, 09:07 PM   #6015
Schrauberklaus
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104.7 wiseco ? nope

I run a 104.0 Piston for a 650 in my XL , run great .

You need to make the opening for the new cylinder sleeve in the Gearbox bigger in case you want to install a 104 mm Piston
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