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Old 08-20-2012, 03:19 AM   #6046
Billtr96sn
Flange Furtler
 
Joined: Nov 2010
Location: Somerset, UK
Oddometer: 393
Moparman Pete

Inlets look good. Exhausts are crudded up with carbon.

Not being rude, but how good are you at being careful?

If you are good, get a blunt screwdriver and CAREFULLY scrape the carbon off around the valve seats. When you have got off all you can, gently scrub the combustion chamber with a wire brush. Then get the coarsest wet and dry paper you have, wet it with oil and clean the combustion chamber with that. Work up the grades until you either get bored or you get a nice even matt finish all over.

Then lap your valves in.

The big thing to avoid is making deep scratches in the ally or (heaven forbid) gouges.

Just remember, your time is free, take as much of it as you like and dont rush anything!!
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Old 08-20-2012, 06:35 AM   #6047
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Spray it with combustion chamber cleaner which will dissolve and soften the carbon for easier removal.

It's available from Mopar too...
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Old 08-20-2012, 09:36 AM   #6048
Billtr96sn
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Warning on that one, dont leave it on a ally head for too long as it will start corroding it. The active ingredients are caustic and that just loves a nice meal of ally!!
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Old 08-21-2012, 11:30 AM   #6049
Mopowa
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Pete,

Oven cleaner works okay on all that carbon. I know you're "shoestring" is probably pretty short right now, but soda-blasting would clean that entire head up like brand new. Check with your machinist, he may know someone that works in their backyard and would do it for cheap. If you looked through my pics, that's how I got all my parts clean.
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Old 08-21-2012, 11:33 AM   #6050
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Quote:
Originally Posted by cam14 View Post
Looks like I need to two standard over sizes over stock on my 85 XL 600 piston. That works out to be 100.5 mm. Are there standard compression pistons available? I have not been able to find Honda OEM oversized pistons. And all of the aftermarket options seem to be 10.5:1 or 11:1. This is not a race bike and hard enough to kick start already.

TIA for your feedback.
+1 on what Jstory said. I've got a JE 10.5:1 in my XL600 and the only issue was a slight "ping" under light load. I raised the needle in the carb and solved that.
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Old 08-21-2012, 04:08 PM   #6051
trouteagle
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need an oil filter cover

Cracked my oil filter cover on a rock and eBay sucks. Anyone got one for my 86 to ship?
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Old 08-21-2012, 06:01 PM   #6052
mcma111
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Quote:
Originally Posted by Moparmanpete View Post



Yeah, TOAST. You need a new head.
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Old 08-21-2012, 06:18 PM   #6053
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Quote:
Originally Posted by mcma111 View Post
Yeah, TOAST. You need a new head.

Are you sure? I think CW might be able fix it. He does welding on combustion chambers.
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Old 08-21-2012, 09:55 PM   #6054
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Quote:
Originally Posted by MentalGuru View Post
Are you sure? I think CW might be able fix it. He does welding on combustion chambers.
Should be fixable but by the time you remove all the valve seats, weld the head, re-machine for the seats, install new seats, tap or insert spark plug hole, well you probably could have bought a new one with cash to spare.
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Old 08-22-2012, 07:15 AM   #6055
gvthnks
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Some run for years like that. Unfortunately cracks like that are very common. I have a couple extra heads with cracks in them...

Fixable, but depending on who does the work maybe not worth what it will cost.
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wife calls it a sickness. I'm running a M/C rescue
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Old 08-23-2012, 01:27 AM   #6056
lookfar
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G'day All,
Not an XL, but picked up an '88 XR 600 today for the price of a couple of slabs of beer.
It is complete, but hasn't run for quite a few years, I think. The petrol had completely gummed up the fuel lines and tap, carby feels seized, and not a lot of compression. Got it as a project, but this is going to take a loooonnnng time to get back on the road.
No pics yet, will post one soon.


.
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Old 08-24-2012, 10:42 AM   #6057
Billtr96sn
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Where is this pine sol thread? Has it got pics? It isnt sold over here and I was hoping to get a look and see if it was sold here but under a different name.
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Old 08-24-2012, 10:49 AM   #6058
iowaboy
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I picked up my xl600 from a farmer in missouri for less than 500 just had to fix a couple things. It has 23,000 miles but only 6,000 on the full motor rebuild he had done.
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Old 08-24-2012, 10:57 AM   #6059
mcma111
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Quote:
Originally Posted by Billtr96sn View Post
Where is this pine sol thread? Has it got pics? It isnt sold over here and I was hoping to get a look and see if it was sold here but under a different name.


http://advrider.com/forums/showthrea...highlight=pine
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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 08-24-2012, 11:54 AM   #6060
Billtr96sn
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Quote:
Originally Posted by mcma111 View Post
Thanks very much.
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