Topic: CB750 Lucky

[fastbroshi]

Looking good Lucky, almost ready to fire it up?

[lucky]

Looking good Lucky, almost ready to fire it up?

Yes ready to fire up.
Just need some fuel line and a valve for temp gas container.

[lucky]

Started the bike up and the engine sounds great. Thanks Cycle Exchange.
The jetting is still not right for velocity stacks.
I will have to take the carbs off and add one shim to the slide needles and I will increase the idle jet to #45mm from #35mm. That is a .006 thousands increase to .018 from the stock .013 thousandths #35mm jet.

BTW...I made three discoveries along the way.

#1
You can set the float level without a measuring device on the 1978 PD carbs.
See photo. Float height when carbs are upside down is .570 thousandths.


#2.
Make sure your float bowls have the drains facing outward on each side of the bike.
#1 and #4 can be interchanged and mine were mixed up from the PO.

#3 The installation of the velocity stacks can cause harm to the carbs if over tightened. To prevent this .. have one of the set screws of the three facing straight down on each carb. Then it will locate the other two screws to be in a position of the carb outlet that is stronger and not likely to dent the outer rim of the carb.
Just tighten the screws until they touch .Thats it. There is a lip that will prevent them from coming off. Put Loctite on all of the little set screws.

[lucky]

Ok...I think I got this video stuff figured out ,bear with me.

I am a beginner OK.

1978 Honda CB750 running!

Now all that is left is the photos with tank and seat and actual test ride to check on that main jet.

And here is all the final information.

Complete restoration with cafe style.
Engine .040 over,road race cam.
Cycle Exchange 4 into 2 into one header.
All metal baffle muffler.
Velocity stacks with screens.
Mains #120
Idle jets #45mm's
Slides with .045 thosandths shim added.
Mixture screw One turn out.
No sync but slides set at .001 between each other. (1.205)

[wedoo2]

Varoommm

[lucky]

Varoommm

Thanks for checking out the video.
I will try to make a better one not featuring my fat self.

[Syscrush]

Sounds great.

[fastbroshi]

Varoommm

I will try to make a better one not featuring my fat self.

lol I'm sure the bike's got enough power to lug you around    Sounds good at idle, I think the echo from being inside messes up the sound at higher revs.  Can't wait to hear it when you bring it outdoors.

[Mcwilliams570]

Way to go Lucky gotta be a great feeling to get it going..

Matt

[lucky]

Varoommm

I will try to make a better one not featuring my fat self.

lol I'm sure the bike's got enough power to lug you around    Sounds good at idle, I think the echo from being inside messes up the sound at higher revs.  Can't wait to hear it when you bring it outdoors.

Aheeemmmm....When you get old you do not plan on getting fat.
But your body and brain already has a plan for you.

[lucky]

Varoommm

Thanks for the kind words.
Thanks for looking at my video.

lol I'm sure the bike's got enough power to lug you around    Sounds good at idle, I think the echo from being inside messes up the sound at higher revs.  Can't wait to hear it when you bring it outdoors.

I will try to make a better one not featuring my fat self.
Thanks for the suggestion about getting the sound correct.
NOW I know why all of those other video's are made outdoors,ding ding ding.

[lucky]

Way to go Lucky gotta be a great feeling to get it going..

Matt

I do feel very good now.
I was on my second rejetting and did not want to have to order more jets and wait for the parts etc.,.

[lucky]

I ran into a snag today while putting on the gas tank and seat.
The Kreem gas tank liner was cracked and it was all lifting off in sheets.

I have done other tanks with no problems but when I did this tank there was something wrong with the liner ,it did not turn white and get hard it had bubbles in it and never did dry.   I got another $40 kit and re did it and the 2nd kit worked perfect. It gt withe nd glossy and hardened but now it is all lifting and cracking. And the surface of the tank looks worse than when I started.

[dagersh]

Lucky,

That stinks about the liner.  How frustrating!  Do you think you will dissolve the bad stuff out start fresh?  It sounds lilke the first coat really killed any chance for the second coat to work.

But on a positive note.....   WOW DOES THAT BIKE SOUND MEAN!!!!!

I can't wait to get there myself!

Keep it up man!

Gersh

[tweakin]

Sounds great lucky.  Nice work.

[lucky]

Thanks for the encouragement.
I really want to keep that tank because it fits with the seat perfectly, so I got a coat hanger,stick,and metal rod and started scraping, because I did not want to put in paint stripper and then have to wash that out.
I do not even know if it would work very well.

I have been scraping and pulling chips of the liner material out, and using a shop vac to get the little pieces. Three hours and I think I have about 70% of it out from what I can see.
I ordered Caswell two part epoxy tank liner this time around. See what that is like.

I am starting to feel better about the whole deal now that my tantrum is over.
I am headed towards a solution.

[TommyT]

Let us know how that tank sealant works out.  I need to seal up my tank and don't want to have to re do it in a year.

[Greggo]

Hey Lucky, if it comes to it, and you're interested I've got a decent black K6 tank in Cotati I'd sell you.  I don't know if that would fit with your seat though..

[lucky]

Lucky,

That stinks about the liner.  How frustrating!  Do you think you will dissolve the bad stuff out start fresh?  It sounds lilke the first coat really killed any chance for the second coat to work.

But on a positive note.....   WOW DOES THAT BIKE SOUND MEAN!!!!!

I can't wait to get there myself!

Keep it up man!

Gersh

I agree with you that that messed up first coat was the root cause of the failure. I put a second coat on knowing it could all go south, but the thicker coating made it a little easier to remove. That was the only good part.
The bottom of the tank seems really solid.
I tried cracking it with a metal rod that was sharpened on the end but could not get it to come apart.

[lucky]

Hey Lucky, if it comes to it, and you're interested I've got a decent black K6 tank in Cotati I'd sell you.  I don't know if that would fit with your seat though..

Thanks for the generous offer Greggo but I believe that tank is about 1.5 inches too short.

Thanks.

[lucky]

Sounds great lucky.  Nice work.

And WHY are you showing me that beautiful tank in your avatar?
You are taunting me aren't you? LOL...lol lol

BTW...Thanks for the compliment on the bike running. I have taken the carbs off at least 3 times and waited for parts etc.,. but it is really worthwhile after you get it to run nice and crisp.

[lucky]

I put some of the paint chips(Corn flakes) into a metal cup and put some MEK into the chips. About 30 minutes and it had all turned to mush.

Trouble is that MEK was not available at my local hardware store so i tried some Acetone. It also worked.

I'm getting there.

[lucky]

Ok...I used the Caswell gas tank liner mixed ithw white colorant which was approved by calling Caswell.
I applied the liner material as the instructions said.
One thing I found out is that for the CB750 tank mix the whole kit NOT 1/2 .
Otherwise it will take too long to get all of the liner material dispersed evenly on the inside tank surface.
My 1978 CB750 tank used one entire kit with NO left over material. I just kept rolling it around until it got stiff. About one hour.
It was about the consistency of honey when mixed, and got thicker. You have about one hour before it sets up.

I kept the room at 70ºF the whole time and on the second morning I touched it and it was hard. It is much better than the Kreem product in my opinion.

Also it did NOT have the horrible odors like Kreem. The Caswell product hardened up faster too.

[lucky]

While I was waiting for that tank to cure I made a new more creative video and solved several technical issues and the video can now be viewed on mobile devices.
CB750 4 into2 into1

[rb550four]

That is a beautiful project you have there. I love the angle on the frame loop and that seat just totally modernizes the entire overall appearance,and looks comfortable and form fitting, I really like it. I have tried colors on the frame a couple of times and wasn't wow'd , but I didn't think of gold, wow, that's real nice. I think that your build may just be the classiest upgrade to an old school style that that I've seen in a long time. Bravo!