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

[edwardmorris]

So I gave ultrasonic cleaning a try today, not too bad but what do you guys think? I tried out the odd ball carb first just in case I screwed something up. Didn't quite go as high as 50-50 simple green and water, I did 1.5L water and the rest simple green till the max mark in the tank. Roughly 45 mins for the body and a full hour for the rest. Cleaned up well, all rainbow colored surface everywhere. Is this a good thing or a bad thing?

[edwardmorris]

The bowl didn't clean all that great on the inside, can I wire wheel the rest of the gunk off? Here's the body

[edwardmorris]

The outside of the body came out great. I blew all the small passages out with the fine tip attachment on the body and the jets.

[harisuluv]

Looks pretty good to me.

That iridescent "rainbow" finish as you describe is what they looked like new.  If you dip them in carb dip, you will lose that, and they will come out gray and dull.  Soda blasting also does not remove that finish.

Sometimes dissimilar metals like brass mixed can affect each other and you might get weird discolorations if they're in the same batch.  You can always segregate any parts you want in a container of some kind, plastic, glass, ultrasonic waves will go right through it.

[edwardmorris]

Looks pretty good to me.

That iridescent "rainbow" finish as you describe is what they looked like new.  If you dip them in carb dip, you will lose that, and they will come out gray and dull.  Soda blasting also does not remove that finish.

Sometimes dissimilar metals like brass mixed can affect each other and you might get weird discolorations if they're in the same batch.  You can always segregate any parts you want in a container of some kind, plastic, glass, ultrasonic waves will go right through it.

Thanks for the tip Harisuluv, I'll try and segregate the small brass parts in a small glass jar with the next one and see how it goes. Hopefully I'll be able to make time before the weekend to at least clean the other three.

Anyone notice anything missing? The fische is toooooo loud and noisy, I'll go through it soon but if you see anything obvious missing, please lt me know.

[edwardmorris]

Goodies from Hondaman/Mark arrived today! Rebuilt swingarm, Hondaman Ignition with super mad cow powers and a few upgrades to the electrics!

Repro harness and NOS ignition switch got brand new flat blade connectors to avoid running a relay.
Alternator coils got new sleeving and connectors to go with the repro alternator sub-harness.

[Terry in Australia]

Looking good mate. Has the snow melted outside yet? Cheers, Terry.

[chewbacca5000]

Those rotors look great!  How did you manage to do that.  Is this a DIY type job?

[edwardmorris]

Looking good mate. Has the snow melted outside yet? Cheers, Terry.

Terry! Long time mate. Yea the snow is gone, but the lousy low temps continue, only made worse by all the rain we're getting. That, plus only having Sundays to work on the bike is destroying progress speed. Hopefully things will smooth out at work soon and we'll be back to normal schedules. I've been doing little bits here and there as I find time, current tedium being sanding the valve train cover, what a PITA it is.

[edwardmorris]

Those rotors look great!  How did you manage to do that.  Is this a DIY type job?

Which rotors are you referring to Chewy? The front brake disc, I had that Blanchard ground per Mr. Benton's suggestion. The oil pump rotors, I just washed them in my simple green parts washer followed by mineral spirits bath. Just cleaned them, I'll be leaving those alone per Mark/Hondaman's suggestion.

[chewbacca5000]

Those rotors look great!  How did you manage to do that.  Is this a DIY type job?

Which rotors are you referring to Chewy? The front brake disc, I had that Blanchard ground per Mr. Benton's suggestion. The oil pump rotors, I just washed them in my simple green parts washer followed by mineral spirits bath. Just cleaned them, I'll be leaving those alone per Mark/Hondaman's suggestion.

Yes the front brake disc.  Who is Blanchard?  Thank You.

[edwardmorris]

Those rotors look great!  How did you manage to do that.  Is this a DIY type job?

Which rotors are you referring to Chewy? The front brake disc, I had that Blanchard ground per Mr. Benton's suggestion. The oil pump rotors, I just washed them in my simple green parts washer followed by mineral spirits bath. Just cleaned them, I'll be leaving those alone per Mark/Hondaman's suggestion.

Yes the front brake disc.  Who is Blanchard?  Thank You.

Not a who, its a what  Its a type of a grinding machine, rare, at least in my area. The shop that helped me widen the grooves on my SKF replacement bearings just happened to have one, so I drove out to Lowell IN and got it done there. Wasn't too expensive either.

[Godffery]

I also provide that Rotor service, if you cant find a local place that will accept small special orders without charging a small fortune.
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/

[chewbacca5000]

I also provide that Rotor service, if you cant find a local place that will accept small special orders without charging a small fortune.
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/

Wow that is great work!  PM Sent.

[Tews19]

Big fan of Godffreys work. I have used several of his rotors on a few bikes. If anyone wants lighted and drilled rotors look no further then to him.

[edwardmorris]

I also provide that Rotor service, if you cant find a local place that will accept small special orders without charging a small fortune.
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/

Hey Godffrey, I thought you didn't have a Blanchard grinder? If you do now, its great news!

[Godffery]

I don't "Have" one; I have a guy With one, that will take small jobs as long as I do them in batches of at least 24 and there are no fancy setups.

[edwardmorris]

I don't "Have" one; I have a guy With one, that will take small jobs as long as I do them in batches of at least 24 and there are no fancy setups.

Ah I see. There is some fancy set up needed though, but its a one time thing. The guys at Midwest Accurate Grinding explained that the disc (or any part) is held true via strong magnets at the center, and the 750 rotors have aluminum/alloy centers that aren't magnetic. They had to rig something up to make it work and your guy might need to do that too. I didn't lose a kidney even with the special set up, they're excited about my build , thankfully a trend I've noticed with every shop I've been to.

[SOHC4 Cafe Racer Fan]

I don't "Have" one; I have a guy With one, that will take small jobs as long as I do them in batches of at least 24 and there are no fancy setups.

Ah I see. There is some fancy set up needed though, but its a one time thing. The guys at Midwest Accurate Grinding explained that the disc (or any part) is held true via strong magnets at the center, and the 750 rotors have aluminum/alloy centers that aren't magnetic. They had to rig something up to make it work and your guy might need to do that too. I didn't lose a kidney even with the special set up, they're excited about my build , thankfully a trend I've noticed with every shop I've been to.

FYI -- I JUST received my drilled and thinned (Blanchard ground) brake rotors from Godffrey.  They look way better then factory new and lighter!!

[edwardmorris]

Its been a while since I posted an update, but I've been doing away bits and pieces here and there as and when I find time between work shifts. Last weekend was a bust because of the pesky check engine light on my car, but thankfully it was sorted out quickly. I'm looking forward to the long weekend coming up and hoping to get the paint started on the frame and swingarm. Its going to be a rattle can job as I've seen people to good work with it, and its easy on the budget and touch ups.

Planning on using Rustoleum Self etching primer and Rustoleum Gloss Black Enamel for the frame and swingarm. Rustoleum also has an Acrylic Gloss Black and I don't know what the difference is. Any suggestions before I dive into this? My plan is to,

Fully strip down to bare metal with Aircraft remover and wire wheel cups and brushes.
Treat rust spots with Eastwood's rust remover gel
Clean with water hose, then Eastwood's Pre treatment
Applying the self etch primer and letting it dry for 24h
Apply one paint coat and let it dry for 24h
Apply another if necessary.

[Bill/BentON Racing]

Like all but one coat, wait 24h. I like one thin coat, 2nd coat a little thicker, 3rd coat the thickest, all within 45 minutes, then dry for 24+, just my rattle can way. Good luck, sent you some pics, 657A carb, sprocket guard and horn, Bill

[Kickstart]

+1 what Bill said


I'm thinking about doing a similar step with a CL77 I started restoring - even though I haven't finished my current cb750 project

The only thing is I'm debating the need to strip the paint.  I was thinking about wire-wheeling the rusted spots, using the eastwood rust converter spray, and giving everything else a good cleaning/sanding before priming. 

I'm not sure if stripping is really necessary - especially because it's never as easy or clean as you think it will be using chemical strippers.  Messy nasty stuff.... except for Peel Away, but even Peel Away requires some mechanical removal.

Just some randoms thoughts 

[edwardmorris]

@Bill, thanks for the tips, will do it that way. PM sent about the rest

@Chris, Rustoleum Aircraft remover is your friend , messy stinky junk but it could not be easier. I didn't even use power tools today, simply slathered on the remover let it sit for five and paint just fell off with just a nudge using a wire brush. Then took a parts washing brush and removed the left over aircraft remover with mineral spirits, then pressure washed with garden hose.

[edwardmorris]

There was more rust than I had thought initially, but at least the internal frame coating is holding up solid. Disappointed in Eastwood's gel dissolver thought, its hardly a gel and kept running off, so I had to really heavily slather it on to keep the rusty spots soaked. Worst of it is up at the neck, so I dumped a whole bunch in every cranny I saw open. Leaving this overnight, will prime tomorrow.

Was gonna do the swingarm today too, but I couldn't for the life of me get those pesky bushings off (small ones). Two socket trick failed, bolt with socket trick failed, time to search what other way will work.

[70CB750]

Making nice progress!