Topic: My 77 CB750K Project Update

[lucky]

Boy, looks like you've got some fun ahead.  Are you replacing the cam while you're here?  I'd also reccomend new cam chain guides & rollers, 'specially with 30K on 'em.

That #3 plug looks like oil fouled, not rich, probably a valve seal.  But, you're rebuilding any possible culprit, so you'll be good there!  Looking over the pics again the #3 intake valve looks wet with oil, so the valve seal is the likely suspect.

I would get that frame redone while it's all apart.  I looked into making some gordon style frame kits (allow removal of the top end while engine is still in the frame) just couldn't come up with the capital to get started.  If you could find one of those now would be the perfect time to install one!  Still gotta wonder why the PO did that in the first place!?!

Here's an install thread of one of the kits I mentioned : http://forums.sohc4.net/index.php?topic=43997.msg457716#msg457716

Keep up the good work!

Tom

Thanks Tom.
Yeah you hit the nail right on the head.  It's a valve seal for sure on #3.  It is pretty easy to see in the pictures, not to mention in person.  But, I do plan on a total head rebuild so problem solved. 

I took a good look at the cam, and it's pretty worn.  So yes, I will be replacing it as well.  Not sure If I'll go with a Web or maybe a K0 cam.  I'll have to see what my budget looks like. 

I was looking into the Gordon frame kit back when I first found the welds.  Many old school chopper and race guys used to cut this section out and never replace it.  Not so sure I feel safe doing that, but I'll just touch up the existing welds and leave it be.
I'll be doing a lot of cutting and welding as I'm leaning heavily towards a streetfighter build.  Something very much like Rodan, the Brian Fuller build that pi$$ed off the SOHC4 world.  Not to mention won a world championship.  But, that's all been covered in another 10 or so threads.  Should be fun! 

Now you have me interested in this Brain Fuller that pissed off everyone.

[mark v]

Yeah I seen on Cafe Racer where Brian Fuller killed a mint SOHC. I dont mind when it is a basket case but when it is a mint bike it is just wrong!

[mrjack55]

Boy, looks like you've got some fun ahead.  Are you replacing the cam while you're here?  I'd also reccomend new cam chain guides & rollers, 'specially with 30K on 'em.

That #3 plug looks like oil fouled, not rich, probably a valve seal.  But, you're rebuilding any possible culprit, so you'll be good there!  Looking over the pics again the #3 intake valve looks wet with oil, so the valve seal is the likely suspect.

I would get that frame redone while it's all apart.  I looked into making some gordon style frame kits (allow removal of the top end while engine is still in the frame) just couldn't come up with the capital to get started.  If you could find one of those now would be the perfect time to install one!  Still gotta wonder why the PO did that in the first place!?!

Here's an install thread of one of the kits I mentioned : http://forums.sohc4.net/index.php?topic=43997.msg457716#msg457716

Keep up the good work!

Tom

Thanks Tom.
Yeah you hit the nail right on the head.  It's a valve seal for sure on #3.  It is pretty easy to see in the pictures, not to mention in person.  But, I do plan on a total head rebuild so problem solved. 

I took a good look at the cam, and it's pretty worn.  So yes, I will be replacing it as well.  Not sure If I'll go with a Web or maybe a K0 cam.  I'll have to see what my budget looks like. 

I was looking into the Gordon frame kit back when I first found the welds.  Many old school chopper and race guys used to cut this section out and never replace it.  Not so sure I feel safe doing that, but I'll just touch up the existing welds and leave it be.
I'll be doing a lot of cutting and welding as I'm leaning heavily towards a streetfighter build.  Something very much like Rodan, the Brian Fuller build that pi$$ed off the SOHC4 world.  Not to mention won a world championship.  But, that's all been covered in another 10 or so threads.  Should be fun! 

Now you have me interested in this Brain Fuller that pissed off everyone.

I'll PM you the link.  I don't want to open and old wound...and rub salt in it. 

[mark v]

Please PM me the link too.

[mrjack55]

Please PM me the link too.

You got it.

[lucky]

You were lucky you ended up with a 1977 CB750K.
It had many improvements in the engine.
About 21 improvements.

[mrjack55]

You were lucky you ended up with a 1977 CB750K.
It had many improvements in the engine.
About 21 improvements.

Yeah, but pound for pound, the earlier engines produced more power.  We have to deal with tuned down smog friendly crap.  Not to mention the PD carbs are a joy to rebuild and set up properly. 

But it is a CB, and it's mine for the building. 

[lucky]

Tonight I tried to tackle the electrical.  Yuck!  Following the schematic is easy enough, but the last guy in here was not so kind.  Had a few mismatched unmarked wires.


I had a couple sets of signals, form different people and different bikes.  Did what I could to mix and match the best of all, and ended up with a cut finger and a major headache.  So, I just ordered a new set from Lockhart Phillips.  Cheap as can be and really cool looking.  Well I like them, to each his own and all that.

I can't believe that the English dude in SoCal sell "his" turn signals for $100.00.  I know, it's for 4 of them, but they can't be that special.  Not on my budget anyway.

There are people selling shocks for a CB750 Honda that want $1200.00 too.
Remember you do not have to buy them.

Some people want $700-1500.00 for a muffler too.
You do not have to buy it.

You can buy the stock shocks for a cb750 for about $125.00
They work just fine. Paint them gold if it makes you feel better.


Its like this... Some people feel like they deserve a lot, and matter of fact the amount they think they deserve for any work they do, or goods they get someone to produce is  like a black hole it is so big you cannot imagine how big it is. For them the sky is not the limit.

Don't you want to buy them an 12 million dollar home and new car? LOL...lol

[mrjack55]

There are people selling shocks for a CB750 Honda that want $1200.00 too.
Remember you do not have to buy them.

Some people want $700-1500.00 for a muffler too.
You do not have to buy it.

You can buy the stock shocks for a cb750 for about $125.00
They work just fine. Paint them gold if it makes you feel better.


Its like this... Some people feel like they deserve a lot, and matter of fact the amount they think they deserve for any work they do, or goods they get someone to produce is  like a black hole it is so big you cannot imagine how big it is. For them the sky is not the limit.

Don't you want to buy them an 12 million dollar home and new car? LOL...lol

I'll admit it, the great signals that I bought for 15 bucks...sucked!  Plastic chrome, broke one within days after the install. 
I know there are many reasons for why guys price items the way they do, and there are just as many reasons  for why guys like to pay more for stuff.  I don't mind paying more for quality.  It all perceived value I guess.  What the fig do I know? 

For the record, no, I'd rather not pay for their 12million dollar home and new car.  I do that enough at work thanks.  I don't even want a 12 million dollar home.  What the hell would I do with it?   

[mrjack55]

10/21/11
Here are a few more pics.  Everything is just sitting right now.  I hope to get in the garage this weekend.  I'd like to start stripping the cases, and get them prepped for painting.

Also I need to clean the plastic (cam chain tensioner) out of the oil pump screen...carefully!  Any tips?