Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50

[edwardmorris]

Cal, did I miss a spot? 

Not unless you intended to leave that area between #1 & #2 intake ports looking like that
[/quote]
Missed my joke, like I did yours the first time 

[edwardmorris]

Gauges are nearly done, new lenses, crimp rings and faces. Not happy with how dull the rings are, will polish them up tomorrow. Clever packaging from Marcel Pic 2 is without flash.

They're looking good! Thank you for using my 'stuff'!

Thanks for making these things and nice how-tos as well.

[mrbreeze]

I know what you mean about the valve cover. They look so much better in person than in a picture after polishing. Mine is only about 1/2 done and I haven't set my bench grinder up for polishing yet. I have the wheels but it's kinda back burner right now. You have really been pumping out the polished parts as of late. I can appriciate the time consuming work that goes into it but the finished product makes it all worthwhile.

Thanks! I will take some pix out in the sun during assembly. This was surprisingly easier to buff, sanding is another story. The screw recesses were my concern, but half inch felt pads fit perfectly in there. Also, I started with a new set of wheels for this one just to get in between the grooves nicely.

Cal, did I miss a spot? 

Yeah when I said I didn't have my wheels set up yet I meant that I did 1/2 of my valve cover with the Dremel! There are many different shaped  pads for getting into the tight spots but I need to get my bench grinder set up for the wide open parts to save time & effort. A few years back I did a couple of upper triples with the Dremel and although it took awhile they sure came out nice.

[edwardmorris]

Got word from JMR, head is done and will be on its way home soon! Can' wait. First available warm and dry day after it arrives, its gonna get painted, baked and safely packed away for winter hibernation along with the rest of the bike. Getting too cold too fast and I just can't seem to find more time than just Sundays to work on it  Oh well, waited this long, might as well get it right for the next season.

[Davez134]

Very nice. Mike says my head is just about done as well. Probably right next to yours on the bench. My project has been stalled so I need some excitement, can't wait to get it!

[edwardmorris]

Very nice. Mike says my head is just about done as well. Probably right next to yours on the bench. My project has been stalled so I need some excitement, can't wait to get it!

I went with all new everything, so obviously the bill is humongus despite MIke's generosity, can't pay via paypal because of the fee so mailed him a check, more delay . To top that off, the weather is looking terrible so I may not even get to paint it. I've been sorting through the tons of NOS parts I've collected over the past year or so. I think I'm gonna box them together per fische page, that way come spring, I pick a box and start putting it together.

The serdi job was killer, biggest part of the bill. I had started porting the head already, but had Mike do it right when the guides were out so hopefully this will be bulletproof.

[Davez134]

Nice! You should be very happy with that. Weather is one thing I have on my side here in Las Vegas. Going to be in mid 80's for the week and no humidity to speak of. I've been cleaning/ painting some small stuff, usually able to paint until mid November.

[edwardmorris]

So this is done, looks somewhat better on the front porch.

[edwardmorris]

Finished polishing the dull stainless crimp rings in the little time I had today. They look happy now 

[edwardmorris]

The head arrived! Few highlights,

Kibblewhite iron guides, honed
APE Stainless Valves
OEM guide seals
Kibblewhite springs
Serdi VJ
Intakes back cut
Porting

Big Thanks to JMR

[edwardmorris]

Intake

[edwardmorris]

Exhaust

[SOHC4 Cafe Racer Fan]

Puuurdeeee!!  Mike nails it, again!

[jerry h]

Wow!  That is a piece of art.    

[edwardmorris]

Wow!  That is a piece of art.

Indeed! And I didn't even go for the ultimate service!

[edwardmorris]

So I managed to make a bad situation worse. In my haste to get the head and jugs painted, I totally destroyed one of the dowel pin on the jugs. All others came of easy, this is the same one that game me trouble when I was trying to separate the head during teardown. Now, the top half is near complete destroyed and everything below the Aluminum level isn't budging. Heat and penetration oil isn't doing squat. Anything I can try before I take it to a machine shop?

[MCRider]

So I managed to make a bad situation worse. In my haste to get the head and jugs painted, I totally destroyed one of the dowel pin on the jugs. All others came of easy, this is the same one that game me trouble when I was trying to separate the head during teardown. Now, the top half is near complete destroyed and everything below the Aluminum level isn't budging. Heat and penetration oil isn't doing squat. Anything I can try before I take it to a machine shop?

I was able to get a mangled one out with a drill. USe a bit that's just a skosh larger than the ID of the pin. Hold the driill real steady and slow, turn it in till it grabs the knock pin. In my case it spun it right out. But that was before I had all the nice work done on it.

[edwardmorris]

So I managed to make a bad situation worse. In my haste to get the head and jugs painted, I totally destroyed one of the dowel pin on the jugs. All others came of easy, this is the same one that game me trouble when I was trying to separate the head during teardown. Now, the top half is near complete destroyed and everything below the Aluminum level isn't budging. Heat and penetration oil isn't doing squat. Anything I can try before I take it to a machine shop?

I was able to get a mangled one out with a drill. USe a bit that's just a skosh larger than the ID of the pin. Hold the driill real steady and slow, turn it in till it grabs the knock pin. In my case it spun it right out. But that was before I had all the nice work done on it.

Thanks, tried that, its just honing it, not quite biting. Next larger size drill is too big, and I'm a bit paranoid. Its not the head, its the cylinders, one of the two lower one, same one that needed a chisel to separate the head.

[oldhatt45]

Not sure if this is worth a try or not, but, can you get something like an Ice Pick between the knock pin and the hole it sits in and get the pin to fold in on itself and hopefully release the pressure on it?

Don't know if that is even an option, but thought I'd throw it out there, just in case.

Charlie

[MCRider]

So I managed to make a bad situation worse. In my haste to get the head and jugs painted, I totally destroyed one of the dowel pin on the jugs. All others came of easy, this is the same one that game me trouble when I was trying to separate the head during teardown. Now, the top half is near complete destroyed and everything below the Aluminum level isn't budging. Heat and penetration oil isn't doing squat. Anything I can try before I take it to a machine shop?

I was able to get a mangled one out with a drill. USe a bit that's just a skosh larger than the ID of the pin. Hold the driill real steady and slow, turn it in till it grabs the knock pin. In my case it spun it right out. But that was before I had all the nice work done on it.

Thanks, tried that, its just honing it, not quite biting. Next larger size drill is too big, and I'm a bit paranoid. Its not the head, its the cylinders, one of the two lower one, same one that needed a chisel to separate the head.

Maybe you could insert a toothpick sized shim flashing or such to get it to grip.

Don't want to hear this yet i suppose. But I always polish the pin and hole to where I can insert and withdraw the pin by finger pressure.  Never tap one in.

[edwardmorris]

Damn, should have checked back here for the more civilized option 

I've got one or two days tops where I can paint so in my head, I went "The barbarian approach is never the best option, but sometimes its the only option".

Cautiously crappy approach, used a hole punch to get it to bend in a corner just enough to get small flathead behind it and voila, tapped all around and it caved in. The corrosion has somehow melded into the alu, I scraped it a little to see how bad it was. Iz got some cleeenin to do now.

On a brighter note, little pieces are now happily baking 

[MRieck]

Damn, should have checked back here for the more civilized option 

I've got one or two days tops where I can paint so in my head, I went "The barbarian approach is never the best option, but sometimes its the only option".

Cautiously crappy approach, used a hole punch to get it to bend in a corner just enough to get small flathead behind it and voila, tapped all around and it caved in. The corrosion has somehow melded into the alu, I scraped it a little to see how bad it was. Iz got some cleeenin to do now.

On a brighter note, little pieces are now happily baking 

Heat works well with those dowels (MAPP gas). Be sure to clean up that edge (a 90 degree chamfer works great but a grinding stone on a Dremel will work)

[754]

Sometimes you can run a tap in and slide hammer them out.
Or tap a round piece inside near inner hole size, then grab it with vise grips..keeps it from collapsing..  But use heat as well

[edwardmorris]

Thanks for the pointers guys, I'll clean it out once I finish baking them.

Barely hit 60 today so I toasted up the garage with my handy propane thingy. Masked up the head nicely and had at it.

[edwardmorris]

Damn gas ran out too quick so couldn't use it to aid with the drying, will let them sit overnight and dry out before baking them up.