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Author Topic: Honda "l'arancio dolce" CB 750 Resto-Mod Project  (Read 6515 times)

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #20 on: Apr 17, 2019, 07:40:49 »
And, if you have a leak on one of the cross-over tubes, you get to pull the rack and separate the carbs to fix it. Might be best to do all of that now.

Was thinking about that too....But since pulling these carbs was so easy (in comparison to my XS 750) I will risk that.Normally I would go all the way, but a good friend advised NOT and NEVER to split these carbs  ;D

I have a question converning changing the oil on that bike:
SInce this is a dry sump is it possible to drain the oil fully without running the engine?...I read that there is a valve that shuts the oil supply when the engine is not running.
Thanks!

Offline irk miller

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #21 on: Apr 17, 2019, 07:45:24 »
This is a guide to totally rebuilding these carbs and separating the rack, but I wouldn't do it unless absolutely necessary.  The throttle shaft requires a set of felt O rings that you'll need to get  or replace with viton to do it.

http://forums.sohc4.net/index.php?topic=146893.0

Offline chicagobob

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #22 on: Apr 17, 2019, 09:31:59 »
I got so fed up with the carbs on my '78 (and I did separate them during the rebuild) that I replaced them with a set of round-tops from a '72 (eBay and a rebuild kit).  Very simple carbs to work on.  I needed new boots, airbox and cables, but now, no more choke cable and easy bowl access without removing the entire rack.  Bike runs like a champ.


« Last Edit: Apr 17, 2019, 09:36:56 by chicagobob »

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #23 on: Apr 17, 2019, 10:03:50 »
I got so fed up with the carbs on my '78 (and I did separate them during the rebuild) that I replaced them with a set of round-tops from a '72 (eBay and a rebuild kit).  Very simple carbs to work on.  I needed new boots, airbox and cables, but now, no more choke cable and easy bowl access without removing the entire rack.  Bike runs like a champ.




Thank you!
That might be the way to go when everything goes wrong.The guy that owns the bike has a second doppelgänger bike with the same carbs so I guess that doesnt help.For now weŽll be cleaning them and then see how it goes.

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #24 on: Apr 25, 2019, 03:30:15 »
So guys-----
SUCCESS!!!!

We have spark!
I cleaned the points with some fine grit paper, puilled the clutch and off we go!!
Needs a new battery since the battery I used is the old battery of off my XS 750 produces not enough power to make a good spark.

So now I face a different problem.The carbs are stripped down, not split and theres this jet that is just stuck into the carb body (see picture).These jets are blocked on all 4 cylinders...theres no way to get these free.Where do these jets/orifices go?I would like to blow trough from the other side and see if it will work..Even a guitar string was useless.Should I remove these?

Thanks in advance!
« Last Edit: Apr 25, 2019, 03:33:49 by TranceMachineVienna »

Offline irk miller

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #25 on: Apr 25, 2019, 07:54:29 »
Grip with with vice grips, twist and rock to get out.  They'll come out.  I would ultrasonic clean the carbs first, but if that doesn't work then they have to come out.

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #26 on: Apr 25, 2019, 15:53:24 »
Grip with with vice grips, twist and rock to get out.  They'll come out.  I would ultrasonic clean the carbs first, but if that doesn't work then they have to come out.
OK thank you.... Little anxious with these carbs :)

The electrical system seems to have hibernated in good condition. Just a few very rusted connections under the tank.
Had to weld a bolt onto one of the screws holding the coils in place :)

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Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #27 on: Apr 30, 2019, 09:24:35 »
Ok so there is NO WAY getting these jets free whatsoever?They are seriously gummed up.Ultrasonical, carb cleaner, air no way, even getting them out was impossible.

For starters: Where do these jets go to?And what are they for?I cannot find any info on the net about these .
Maybe if I can find the "rear" part of this circuit I can blow or poke trough there....

I also cannot find these in the aprts diagram...can anyone point me out where I can find them in the diagram?

The other circuits and passageways are clean and show a good stream of carb cleaner when blown trough.Keyster kits are installed.

Thanks in advance for your help!
« Last Edit: Apr 30, 2019, 09:47:21 by TranceMachineVienna »

Offline irk miller

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #28 on: Apr 30, 2019, 09:58:00 »
Those are your pilot jets, so unfortunately they are hugely important.  You can spend a few cans of carb cleaner and keep spraying them out and digging at the crap with an E string.  They should come out, albeit very resistantly.

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #29 on: May 05, 2019, 17:55:34 »
More progress on the Cb....
We  finally got the carbs cleaned and nearly ready for putting them back on the bike.
The pilot jets came out and all orifices and jets are clean and free.
We made sure that the pumper circuit was also free and clean.
We are missing a few little pieces and hoses but all in all we are good to go.
Next up is draining the old oil and changing the old oil filter before the first start.
Before we can start the bike we need to 'find a spark'.
It currently has no spark on all 4 cylinders.

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« Last Edit: May 05, 2019, 17:57:12 by TranceMachineVienna »