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Author Topic: Honda "l'arancio dolce" CB 750 Resto-Mod Project  (Read 6225 times)

Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #40 on: May 18, 2019, 09:04:04 »
More progress on the Honda.
Cleaned out the oil sump yesterday after letting it sit in diesel.Drained all the remaining old oil from the oil tank.
Slow but good progress.
The fine dust on the oil pump grid turned out to be rubber dust.
Cleaned the oil sump screws. This will go back on the bike today.


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Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #41 on: May 20, 2019, 06:50:25 »
GOOD PROGRESS ON THE CB!  8)

Invested some more time and now I have spark on all 4cylinders!

Cleaned the points,regapped one of them (it wasnt not closing properly) mounted new plug boots on 2 of 4 cylinders.
and boom! we have spark!

Here I have a question: Is it possible to remove the spark plug wires from the coils?They look like they are "hardwired" to the coils?I would like to replace them.

Also I cleaned the oil system with some fresh oil, drained and flushed the oil tank with oil.
Remounted the oil sump.

Hopefully I will be able to start her up soon!
« Last Edit: May 20, 2019, 06:53:57 by TranceMachineVienna »

Offline irk miller

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #42 on: May 20, 2019, 08:00:02 »
I have tried those particular ones, so I'm speculating, but I have done several others that came on Cb360's.  The coils had a hole with a metal screw center in the bottom.  The wires were pushed into the hole with epoxy from the factory.  So, all I had to do was break up th epoxy, pull the wire out, push a new one in with epoxy.  Pretty easy.  It would be nice if yours are the same way, but I haven't tried with them.

Offline der_nanno

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #43 on: May 20, 2019, 12:02:01 »
Epoxied in. 50:50 chance at best to get them out without breaking the coils.
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Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #44 on: May 20, 2019, 14:59:42 »
Put in the work..
Popped in the carbs and boom the bike ran for a few strokes!
Carbs were losing gas over the brass pipes on 1 and 4 and no gas in them so I guess I swapped float chamber 1 and 4...or do you guys have another idea?
The floats and needles look like they are in good order (new needles).


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Offline irk miller

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #45 on: May 20, 2019, 17:03:05 »
Try polishing the seats of the float valves.

Offline pidjones

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #46 on: May 20, 2019, 17:20:12 »
The needles can stick at first - try tapping the float bowl with the handle of a screwdriver. The brass overflow tubes also develop cracks along their length, can be soldered.
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Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #47 on: May 21, 2019, 10:19:29 »
So just pulled one of the carb bowls. Looks like there are tiny holes in the brass pipes. Is this supposed to be down there?
These brass tubes are supposed to be without any holes till the top to work as an overflow aren't they?

I will fill the chambers with fuel and pump some air from the bottom to see if these holes are really holes or just caverns.




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« Last Edit: May 21, 2019, 10:21:49 by TranceMachineVienna »

Offline pidjones

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #48 on: May 22, 2019, 11:10:33 »
Just pour rubbing alcohol (isopropyl) in them and see if it comes out the tube (with the drain closed, of course). They can be soldered with plumbing solder and a powerful (I use butane powered) iron and using acid flux. Clean well first.

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Offline TranceMachineVienna

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Re: Honda "l'arancio dolce" CB 750 Resto-Mod Project
« Reply #49 on: May 22, 2019, 11:58:42 »
Try polishing the seats of the float valves.

Again success!

I did all what you guys said...Took the carbs off and polished the needle seat with some tooth paste and q tips.Then I checked on the cylinder 1-4 brass pipes and YES, number one has  at least 5 holes in it.The needles were sticking to because I tried filling the bowl with gas and the drip was minimal.
I will solder these holes but for now I will leave them since after polishing the carb seems to hold up fine!

I litered the carb out, there seems to be a big difference in float height setting.Do you guys know the right float height setinng for the K7 models?Normally these are in 20MM range.
I cannot find anything about that in my manual.

Before I start the bike I would like to see that the oil is coming up into the head, how can I check on that?
Thought about removing one of the caps on the head, remove the spark plug caps and then turn the engine with the electric start to see if oil is going there.

Thanks in advance!