Topic: smpls '72 750 project

[smpls70]

So......here we go, Ive been sitting on this bike for awhile, it never really ran all that great, never even rode it all that much, it leaks oil, carbs have been rebuilt, twice, electrics are all messed up (lesion learned !!!) thats for a later date. I want to see if I can get this motor in decent working condition , it doesnt need to look pretty , just reliable. As I said it leaks oil, so ive known it needs new gaskets, possibly an overbore ,new pistons and rings , and for sure a valve job ( was setting valves and could not get the gauge through  the #4 exhaust , I have a post on here about this ) The bike has 50 grand on the clock, but I like it and I want to keep it, its my first and only motorcycle ! So heres where im at now . the motor is out, rocker arms are off , but im a little stuck on getting the cam out, its loose and the bolts are off the sprocket , its like some kind of a puzzle getting all the lobes through, ........ of course any tips, advice, .02 worth is more then welcome, see if we can get this thing up and runnin  thanks in advance.........

[smpls70]

Got the cam out ,found a few nicks and scuffs on one of the lobes......is this ruined ?

[smpls70]

2nd pic is 3 & 4, 3rd pic 1 & 2.......

[Aladinsane07]

Good to see another Minnesotan, and from Minneapolis nonetheless!  Keep the updates coming. I'll be watching this one.

[smpls70]

Been slowly putzing with this , started to take the valves out today, the # 4 EX. is stuck in there. Could only get at the outside valves , the valve spring compressor tool I have will not reach the inside ones  Off to Sears to find one that will work ".........Sears , God  D@*$n right ,Sears .." as Tim Allen would say. I talked  to a shop today about putting in new valve guides and they quoted me @ around $100 -150 ? Sound kind of steep ?

[smpls70]

pics

[fasturd]

Nice to see you tearing into your 750! With my 400 pretty much done I have started another 750 too! Going to first Thursday?

[smpls70]

Nice to see you tearing into your 750! With my 400 pretty much done I have started another 750 too! Going to first Thursday?

maybe the next first thursday, if not then the 3rd one, if that makes any sense 

[smpls70]

I got all the valves out, finally,..... then I notice this little round ring laying on the ground, start looking all around trying to figure where in the heck this thing came from or what its is, then I see....... valve retainer ?  oh crap !!!!!! Can this be put back in ? or is it toast ?

[Doctor_D]

You mean to say that the valve seat fell out of the head?  New ones can be cut from Ampco75 bronze and pressed into place, so nothing's beyond repair.

Looks to me like someone might have done some port work. Given the results of their previous valve-work, you might be best served by having Mike Rieck or APE go through the head for you. It's small dollars (about $700 at APE) to do a good head rebuild, and worth every penny.

[smpls70]

You mean to say that the valve seat fell out of the head?  New ones can be cut from Ampco75 bronze and pressed into place, so nothing's beyond repair.

Looks to me like someone might have done some port work. Given the results of their previous valve-work, you might be best served by having Mike Rieck or APE go through the head for you. It's small dollars (about $700 at APE) to do a good head rebuild, and worth every penny.

Yeah , it just fell out !! how about that, I would love to have a  good head rebuild, $700 is not in the budget at the moment though, i'll figure something out though.....

[smpls70]

hmmmmmmmmm,.......ok, im cheating.................$250 + 20 for a swingarm..............

[traveler]

Good score!  Is the engine strong enough to forgo the rebuild?  If so, that will save you a TON of money!

I'd recommend a SEVERE anal retentive engine cleaning followed by painting before install....

~Joe

[Aladinsane07]

Nice score.  CL find?

[Zaipai]

Based on what I have seen here, its time to have that head rebuilt. Easy to say its not my money. However it does provide such good piece of mind. That said, nice bike can't wait to see it finished. You going for a total restore, or just get it cleaned up as much as you can or a Cafe?

.: Scott :.

[smpls70]

Im thinking on opening it up, see how it looks inside, maybe put a new gasket kit in,put it on the bike, ride it out the rest of whats left of the season, and which ever is the better of the two, rebuild it up into on hell of a nice motor, The guy that sold it to me said he checked the compression before he pulled the motor,claims its solid, it was kind of weird , before I could take the motor, he wanted to take out the starter, not a real big deal, they have alot of mc parts out on this farm ,about 45min. south of Minneapolis, and theres this huge pile of swing arms sitting there , and right on the the top,written on it "73 cb750" score!!, its in great  shape ,........ anyone know of the legalities of switching the motor out, our is it nothing to be concerned about ? I was just kind of curious about it

[Zaipai]

Im thinking on opening it up, see how it looks inside, maybe put a new gasket kit in,put it on the bike, ride it out the rest of whats left of the season, and which ever is the better of the two, rebuild it up into on hell of a nice motor, The guy that sold it to me said he checked the compression before he pulled the motor,claims its solid, it was kind of weird , before I could take the motor, he wanted to take out the starter, not a real big deal, they have alot of mc parts out on this farm ,about 45min. south of Minneapolis, and theres this huge pile of swing arms sitting there , and right on the the top,written on it "73 cb750" score!!, its in great  shape ,........ anyone know of the legalities of switching the motor out, our is it nothing to be concerned about ? I was just kind of curious about it

Can't speak for your area, however here in Wisconsin the frame number is what is on the title so what numbers are on the motor does not matter, so I would start there and see what numbers are on the title.

.: Scott :.

[smpls70]

Just wondering IF it is possible to straighten this out ??

[Zaipai]

Just wondering IF it is possible to straighten this out ??

I have seen them straightened out before, however you need some one who knows how to tell you how to do it correctly. Seems to me if I remember correctly, it was not hard to do.

.: Scott :.

[smpls70]

Just wondering IF it is possible to straighten this out ??

I have seen them straightened out before, however you need some one who knows how to tell you how to do it correctly. Seems to me if I remember correctly, it was not hard to do.

.: Scott :.Yeah, I did not want to try and bend it back and end up breaking it , thinking it needs to be heated up ? I can live with it, but ya know.......

[fasturd]

There is no problem switching the motor out. When you sell the bike the new owner has to put the engine number on the title. The new engine will then be attached to that bike...As long as some one else has not reported the new engine as stolen... I have never had it be a problem on vintage bikes.

[smpls70]

Started to tear into the new swing arm, cant seem to get a decent pic of the thing, but I think this thing is is pretty nice lookin' !!, however the felt rings have ripped , came apart, thinking of going down to the local hardware store and seeing if I can find something to work? Have to study up on the Hondaman book see if theres some kind of remedy before I start ordering parts , want to get this bike going A. S. A. P. !!!!!!!

[smpls70]

more...

[Zaipai]

You might PM Hondaman and get a price on his swing arm rebuild. He does an better then new job and if you can afford it and don't mind the little wait its well worth it.

.: Scott :.

[smpls70]

SOLID !!!!