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the diecast cases are stronger and have better bearing and better bearing bosses in the transmission. Yes the problems was some times the cases, or rather the mainshaft bearing bosses which allowed flex if you were abusing the bike (hence the tossed drive chain) and the cam tower bosses in the head, not just the tensioner.

Honda did not have all of the "bugs" worked out by the end of sandcast production. By the end of K0 production they did have most of them worked out however and the diecasts were less likely to toss a chain. If you were ordering a 970 kit (CR750) through honda for a sandcast bike you were "encouraged" to take a set of cases as well, most real 970 CR750s are diecast engines.

Some of the sandcast motor internals are completely different from other cb750s, so it is good that you got a complete engine. If you are going to build a special out of it then I would set the sandcast motor aside and go find a set of 1978 cb750F cases and transmission as they are the strongest (excluding the hondamatic).

Fang, I do have some REAL 970 CR750 parts if you are interested. One is a complete front end (clipons to tires) with magnesium dual disc pieces and another is an original set of Kehin carbs. I used to have a CR750 tach but that has been gone for a while now. IT won't be cheap and most of it is good only for racing but hey it is here.
 

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Discussion Starter #22
Thanks for the input. I'm not a kid, but I sure feel like one in a candy store. My head is still spinning with ideas, so I have a little thinking still to do before I start to move on this one.

Geeto, thanks for letting me know about your stuff. I'll keep that in mind as I am processing through ideas.

I looks like I need to build one of the other bikes for sale first, and just let the juices stew.

peace and grease,
fang
 

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Discussion Starter #24
LOL.

Hey, Geeto, is your CR the unobtainable "works" one? The one which was not made available to us, the unwashed public? You know, the one with 4 axle nuts on each fork, magnesium lowers and ti uppers + lower stem? If so, we need to talk. =)

peace and grease,
-fang
 

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Yeah, restore the sandcast to stock, put it in the basement for the retirement fund.

Find an old POS 750, make a CR750 outta that.
 

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quote:Originally posted by Fang

LOL.

Hey, Geeto, is your CR the unobtainable "works" one? The one which was not made available to us, the unwashed public? You know, the one with 4 axle nuts on each fork, magnesium lowers and ti uppers + lower stem? If so, we need to talk. =)

peace and grease,
-fang
I will have to look but off the top of my head I will say that it is probably a JDM set of Sandcast forks with all the 970 magnesium brake pieces (the kind that was available over the counter at honda). I do remember all the castings and labels on the fork being in japanese and not english.

I did spot a set of those magnesium forks at a well known Race Shop recently when I was digging around in the basement, but knowing the owner they are not for sale at a reasonable price.

here is a pic I took a while back when I had just finished pulling it out of storage.




I bought out someone's cb750 race operation a couple of years ago, one of his bikes had been a really early diecast (less than 10 numbers away from the last sand cast vin). I sold the 970 tach that came with it a long time ago.
 

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I do have this lying around:



which is part of a bracket set to attach the cb750 caliper to HD or Ceriani forks.

and this:



kosman hub setup for a cb750 axle and cb750 chain line. It uses a real grimeca caliper (not one of the later ones). It came attached to this:



an RC swingarm adjustable for chain length and shock height. make no mistake this mutha weighs a lot, saw them a lot in drag racing, occasionally in road racing.
 

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Discussion Starter #29
Thank you for posting the pics. Looks like you have some great stuff. I think I have the same front end as that. The magnesium bits are soo unobtainable and hot, but I don't think I would ever actually put them on a machine that will be primarily driven on the street.
That RC swing arm is pretty rad. Is it aluminum? Either way, it looks like a golden brick.
quote:Make no mistake this mutha weighs a lot...
That's how it goes:
RC = heavy, clunky, overbuilt, raw American power. (And good thing too because it needs to be tough to stand up the the abuse it creates.)
Yoshimura = light, better balanced, more refined, more fragile, graceful. (But that's OK because it works together with Zen harmony.)

My personal building philosophy is more of a Yoshi one. I'm a fast, light and graceful kind of guy.
.
My favorite Street Fighter character always was Chun Li.


This has everything to do with sandcast CR750s!

Peace and grease.
-fang
 

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if it makes you feel any better Fang, I also subscribe to the japanese philosophy of better balanced and more refined. To add to the skickness I also collect MIJ and CIJ Fender Guitars and odd ball other japanese stuff. I am in the middle of a couple of side projects right now, one of which may be importing japanese cb750/tu250/w650 stuff (the rare and unavailable here stuff) into the states.

I have to be honest, not all of the yosh stuff is a slice of heaven. While pretty, the early yoush pipes hung on to the motor by the exhaust collars, not ideal and lead to cracking. some of their cams are also not ideal, shifting the powerbands too high up the rev range.

If you ever read the account of how honda won daytona in 1972, it clearly points out that honda overtuned the bikes and all but Dick Mann's bike (which was the closest one to stock spec) retired early with mech failure. Honda kind of overshot that a little as they were trying to show dominance.
 

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Discussion Starter #36
Stayed up late working on the tank. I decided to ditch the whole back fill the cut outs with silver idea. While removing all my progress up to this point I discovered a pin hole that had developed under the stress of multiple reheating + the initial hammering. So I got to repair that. I will be using Bondo tomorrow to smoothing things out, and if I am lucky I might even paint the bike by tomorrow night or Friday.

The color will be chosen after I see how well I am able to finish prepping the tank.... I would like to paint it a nice, deeply lustrous, pearlescent black. But if the tank is still ugly when I am done it will be a ghey, 'hot rod' satin black, or some other darkish satin color. Either way I want to do the knee cutouts in a glossy silver/ aluminum, with some red pin striping which will help pull in the red leather highlights in the seat.

Wish me luck, I have a lot of work to do and not much work to do it.

In other news, I think I will be parting out most of my 1969 Sandcast CB750 stuff this week. I have two of them. If any of you are interested AND are willing to pay stupid money, please let me know! Neither one is complete. Otherwise the stuff soon will be seen on evilBay. I will keep enough crap so that I can still build a CR racer and honestly title it as a 1969 bike, but I am pretty sure it will be sporting a later SOHC 900c die cast motor instead of a sand cast one.

Its almost 3:0 am. A guy needs his vitamins: time for a smoke, a beer and some honest-to-God sleep.

peace and grease,
-fang
 

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Discussion Starter #37
Exciting update/shameless self-promoting plug: Most of my sandcast is now up on eBay, and the rest will be there soon!

You can check out my auctions here: http://motors.shop.ebay.com/merchant/phi1osopher Go ahead and but some of that crap really good stuff.

I also am selling some other goodies like a 16" rear wheel and a Tracy body project.

In other news, I got a guy over on the sandcast only forum to cuss me out for destroying a valuable piece of history and making a mockery of their valued restorations. I said that I was going to sell out my sandcast, and his panties got all in a wad. HERE PLEASE DON'T GO OVER THERE AND STIR UP THE COALS!!! LOL.

Peace and grease,
fang
 

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Decent points made on both sides of that argument. I personally am loathe to destroy (forgive me if my choice of words here offends) anything period, which is why I began my 350 project by buying it one piece at a time and assembled them back into a motorcycle. Cost more than a complete running CB350 this way, but I am comforted to know I am not damaging an otherwise restorable bike. I know CB350s are a dime a dozen, but I also know the frame, motor, etc I bought will not be going to the scrap pile, all because of me. The guy who's trying to restore his sand cast 750 does indeed need sand cast parts, and where does he think he's going to procure them? I suppose, since you are using die cast cases anyway, why bother using the sand cast frame? You won me over Fang, when you said "Shame on you..." to that dick. I love it when grown men say that to each other. Geeto, sawzall... Good shit.
 
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