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R&R Cylinder Head with Tech Assist (Read 1534 times)
ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #270 - 12/29/23 at 08:42:45
 
Please take a look at the following photos.  I think I did a pretty good job cleaning up and not not getting trash down the holes.

Do I have the "green light" to install the new head gasket and head?  

And again, where should the dowels be when I put the head back on?  Logic tells me they should be in the cylinder (not the head) so I can get the head gasket aligned and situated in the right place.
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Cylinder_Mating_Surface.jpeg
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #271 - 12/29/23 at 08:46:33
 
Cylinder walls look good.  No scoring.  Just some oil/carb cleaner residue lines where the piston rested when I was trying to float Woody within reach of various extraction gizmos.
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Cylinder_Walls1.jpeg
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #272 - 12/29/23 at 08:47:26
 
Another angle view of the cylinder walls.
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Cylinder_Walls2.jpeg
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #273 - 12/29/23 at 08:49:39
 
CC side of head.  Cleaned up nice in my opinion.  With some of the carbon removed, it appears my valve seats look pretty good.
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Head_Cylinder_Side.jpeg
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #274 - 12/29/23 at 08:52:53
 
Top of Head.  The mating areas will get a final wipe down with 90% isopropyl before the Suzukibond application.
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Head_to_Cover_Mating_Surface.jpeg
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #275 - 12/29/23 at 08:56:45
 
What I plan to use as an applicator for the Suzukibond.  This will help me keep my bead thin and give me better control (aim) during application.  A tip from Dave and I just happen to have these laying around.
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Gary_in_NJ
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Re: R&R Cylinder Head with Tech Assist
Reply #276 - 12/29/23 at 10:00:15
 
Paul,

I know you don't want to hear this, but that cylinder could use some love. It shows signs of scoring, and the cross hatching is gone.
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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #277 - 12/29/23 at 10:41:18
 
Argh!  You’re right Gary.  I don’t want to hear that.  That’s too much love for me!  Way above my pay grade!  Y’all just trying to make me do a big bore and new flat top piston!

Bike has 10,700 miles.  Lack of timely oil changes with good oil like Rotella with ZDDP?

How much cross hatch honing should I see?  Is this piston gunna fry without attention?  Argh!
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Re: R&R Cylinder Head with Tech Assist
Reply #278 - 12/29/23 at 12:04:07
 
Wow that piece of wood was a lot bigger than I expected.

Nice work thumper this is a really valuable thread.
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DragBikeMike
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Re: R&R Cylinder Head with Tech Assist
Reply #279 - 12/29/23 at 17:26:39
 
"Do I have the "green light" to install the new head gasket and head? "

Not yet.  You still have some buildup on the cylinder liner right where the head gasket fire ring seats.  If you recall, this area looked questionable, as if the head gasket was leaking a bit.  There was brown discoloration indicating possible leakage.
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Cylinder_Mating_Fire_Ring.jpg

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DragBikeMike
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Re: R&R Cylinder Head with Tech Assist
Reply #280 - 12/29/23 at 17:30:55
 
That area should look like this all the way around.
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Cyl_Liner_Cleaned.jpg

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Re: R&R Cylinder Head with Tech Assist
Reply #281 - 12/29/23 at 17:37:41
 
I agree that the scratches in the top of the piston are of no concern.  What I am concerned about is the cylinder wall.  While you were fishing around in there, you may have chewed up the cylinder wall.  Although your pictures are very good, I can't see the detail on the cylinder wall.  Got any of those scratches on the cylinder wall?

You are correct, the dowels need to be in the cylinder.  Those little buggers can be a pain in the neck.  You don't wanna just grab em with pliers, they are precision pieces.  I find that a small hose clamp works great for dowel removal.  You still have to be careful.  You want the clamp positioned well away from the gasket surface, so you don't chew up the sealing area.
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Dowel_Removal2.jpg

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Re: R&R Cylinder Head with Tech Assist
Reply #282 - 12/29/23 at 17:39:06
 
Then you grab the clamp instead of the dowel.  A little rotation and a little pulling and the pesky dowel usually comes right out.
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Dowel_Removed2.jpg

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DragBikeMike
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Re: R&R Cylinder Head with Tech Assist
Reply #283 - 12/29/23 at 17:48:58
 
The head gasket surface on the bottom of the cylinder head looks OK.  It has more scratches than I'd like, but I suspect that it could simply be an optical illusion.  Sometimes a photo can make a scratch or divot look way worse than it actually is.  Did you use anything other than green ScotchBrite to clean the surface?

The 8mm head stud on the front side of the head looks like it could be a little proud.  Those studs have a tendency to pull out.  That usually happens on motors with enlarged exhaust ports and higher compression.  Check that stud with something perfectly flat and sharp.  Make sure the steel shoulder on the stud is not situated above the gasket surface.

See how this tool bit snags the edge of the shoulder on the stud.  It shouldn't do that.  If the shoulder sticks up above the aluminum sealing surface, it will interfere with proper gasket crush.
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Front_8mm_Stud_Proud.jpg

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ThumperPaul
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Re: R&R Cylinder Head with Tech Assist
Reply #284 - 12/29/23 at 17:49:46
 
I’ll see what I can do with it.  Gary in NJ has me worried about the cylinder walls now.
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