Topic: 1974 cb750

[Schnell]

I don’t think there are dust caps above the clips, just the boots? Did you wrap that baffle or still annoying the neighbours? Looking good!

Oh okay, I wasn't sure. I was remembering a Youtube I watched on replacing seals then. Good to know! I have not found that rubber ring on the top of the fork ears.

I'm awaiting a parcel from vintagecb750 which includes that fiberglaass wrap, brake pads, and assorted little bits.

[BenelliSEI]

Good luck. That wrap should quiet it down a lot.

[Schnell]

John, I forgot to point out the rear turn signals that you donated. Thank you very much.

[BenelliSEI]

Nice!

[Schnell]

Brake pads arrived today and I installed them. I just used the 2 big bolts that hold the assembly together to squeeze the new thicker pad into the caliper. Even with adjustment, the brake drags. May have to disassemble and press the pad in farther.

I wrapped the baffle with the fiberglass mat that was in the order and the exhaust sound is much better - more subdued. I don't want this bike to sound like a superbike. Braaap, braaap!

[Schnell]

Used a C-clamp to push the new pad into the caliper. Much better - the wheel will spin 1 revolution before the pad drag stops it. The pad does not retract when the brake lever is released. Looks like it needs a new seal.

I reduced the fiberglass mat wraps around the baffle to 1 time (from 2.)

Fine tuning of carbs still needed. The motor struggles to build revs from idle. (0 to 1/4 throttle twist) I adjusted the air screws from 1 to 3/4 turns out and it got better. Other factor affecting first 1/4 twist of the throttle are the slow speed jets. I should try out bigger ones, and I think I have a such a set in a spare carb rack i've got. I haven't checked the numbers but the main jets were bigger 120 ones. I assume that the slow speed jets would also have been switched for bigger ones. We'll see. I can remove a slow speed jet from an outside carb without removing the whole rack, in order to check it against a slow speed jet from the spare carbs.

[Schnell]

Was able to remove the slow speed jets with carbs still attached. They are #40, same as in my spare carbs. But I'm soaking them in carb cleaner and will ensure they are completely clean. I placed the container they're soaking in on the pool pump which gives off some good vibrations.

I also discovered a kink in the yellow Tygon fuel line supplying 2 of the carbs, so that needed fixing.

Planning to get it all together before the evening.

[Schnell]

Oh joy and happiness! Bike runs great with super clean slow speed jets and no kinked fuel line. Revs up quickly now.

Looking forward to a successful carb syncing tomorrow.

[70CB750]

Oh joy and happiness! Bike runs great with super clean slow speed jets and no kinked fuel line. Revs up quickly now.

Looking forward to a successful carb syncing tomorrow.

Well done!

[BenelliSEI]

Perseverance pays off! Great.

[Schnell]

Thanks, Prokop and John. This bike has been a rewarding journey so far. I love the feeling of riding this bike (now that it's running well now) compared to riding my long term '81 BMW R100. It's new and exciting. And it brings back good memories of my trip around the US on my first CB750, since sold on.

I'll be looking for a rear luggage rack for my new CB750.

[newday777]

Thanks, Prokop and John. This bike has been a rewarding journey so far. I love the feeling of riding this bike (now that it's running well now) compared to riding my long term '81 BMW R100. It's new and exciting. And it brings back good memories of my trip around the US on my first CB750, since sold on.

I'll be looking for a rear luggage rack for my new CB750.

My favorite color! I have a K5 in Planet Blue.
I have a KG rack if you want for $25.
Not too rusty and looks like it'll clean up alright. Missing a couple rubber strips you can replace and spacers and longer rear bolts. I don't have it mounted on my K5, but lines up. It was on a K8 I bought.
I'm in NH so not sure how much for shipping.

[Schnell]

Thanks for the offer, Stu. I'm located near Toronto in Canada though, so shipping a big box would be the limiting factor. My postal code is L9P 1B4 if you have the time to inquire about shipping.

[newday777]

Thanks for the offer, Stu. I'm located near Toronto in Canada though, so shipping a big box would be the limiting factor. My postal code is L9P 1B4 if you have the time to inquire about shipping.

I'll find a box and check it. Yes the rates have gone through the roof in the past 15 years. Anyone know of a cheaper way than usps?

[BenelliSEI]

Go with US Post. The couriers all add ridiculous brokerage fees……

[newday777]

Will do John
I had to make a box to size and I ran out of time before the post office closed for the weekend. Monday is a holiday here so it'll be Tuesday before I can check the prices.
I did get the set screws out with some PB blaster and heat. Cleaned the adjustable mounts and will wrap them separately in the box to shorten the box size.

[Schnell]

Successful carb sync!

Remaining deficiencies:

     -front brake drags a bit, still able to push bike around, if disc over-heating is detected then it'll need a new brake cylinder seal

     -missing/lost rubber ring/seal on one of the upper fork ears hole, just under the top triple tree, I won't be riding in heavy rain

     -starter button is missing, I use a nail or wire or air inflate needle to start bike with electric starter, or use the kickstart

     -the clutch lever safety switch is broken, mechanic said no problem for safety, will replace eventually

In my small town, Canadian Tire has one really good mechanic that does motorcycle safeties. He just left for 3 weeks holiday. I do not know of anywhere else in Uxbridge that is certified to do this. With a safety, I could switch over insurance from my 1981 BMW R100, get a license plate, and ride this bike today!

     -I have an electronic ignition to install, but the bike runs perfectly now so I'll wait a while

[Schnell]

Will do John
I had to make a box to size and I ran out of time before the post office closed for the weekend. Monday is a holiday here so it'll be Tuesday before I can check the prices.
I did get the set screws out with some PB blaster and heat. Cleaned the adjustable mounts and will wrap them separately in the box to shorten the box size.

Thank you Stu! Hopefully postage will be reasonable. Your selling price certainly is.

[BenelliSEI]

Frank…… check with Rick J. He probably has someone local that does his “safeties”.

[newday777]

Good job on the sync.
On the brake dragging, is the caliper centering screw adjusted so the wheel spins freely before you hit the brake? If not it will drag. Loosen the 10mm locking nut try adjusting the screw one way a little at a time, spin the wheel to check. It should be turned away from the resistance a little until no resistance, then 1/8-1/4 turn more, then hold the screw as you tighten the locking nut.

Otherwise you might have blockage in the return hole in the master cylinder if it spins free before you hit the brake, then gets stiff after you hit the brake and doesn't release pressure to spin free. Or you can have hardened gunk behind the piston seal in the groove that needs carefully scraped out of the groove

[Schnell]

I think that a master cylinder rebuild as well as a new brake cylinder seal will be required.

[Schnell]

Labour Day: I attended to the dragging front brake today, disassembling cleaning, and using some parts from my parts bike. I'm happy to say that that issue looks to be resolved. I hope to get a safety check done this week, then switch over insurance, licence plate, and ride!

Went for a shake down ride around the block. Is the anything that sounds as sweet as a well running vintage cb750, especially when it's by your hands and effort that brought it there!?!

[tctreppin]

Labour Day: I attended to the dragging front brake today, disassembling cleaning, and using some parts from my parts bike. I'm happy to say that that issue looks to be resolved. I hope to get a safety check done this week, then switch over insurance, licence plate, and ride!

Ride!!!


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[tctreppin]

Labour Day: I attended to the dragging front brake today, disassembling cleaning, and using some parts from my parts bike. I'm happy to say that that issue looks to be resolved. I hope to get a safety check done this week, then switch over insurance, licence plate, and ride!

Ride!!!


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I’ve been reading your progress , it takes a certain type of man to admit he needs help another to post that ,ask for help, and then tell the rest of us how he’s advancing . Thnx


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[Schnell]

I see that you have an eyelid on your head light too!