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Author Topic: CB750K6 Fuel Pipe Routing  (Read 542 times)

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Offline M 750K6

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CB750K6 Fuel Pipe Routing
« on: December 12, 2023, 01:09:13 AM »
My carbs are off at the moment. Does anyone have anything that will show me how the fuel lines run and join, (including the run through the carb gantry), to connect to the fuel tank's left side single fuel tap?

Many thanks.
Martin
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Online newday777

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Re: CB750K6 Fuel Pipe Routing
« Reply #1 on: December 12, 2023, 02:23:39 AM »
The first two pictures are from the web.
2nd shows the line to petcock coming out through the hole in the carb rack mounting web.
3rd is my K5 carbs on the bike.(same as K6)
Hope that helps.
« Last Edit: December 12, 2023, 02:26:03 AM by newday777 »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline M 750K6

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Re: CB750K6 Fuel Pipe Routing
« Reply #2 on: December 12, 2023, 02:56:45 AM »
Thanks for taking the time to do that, that's clear. Appreciated.

Before I took the head apart, I was struggling with cyls 1 & 2 running too rich, 3 perhaps a little rich and 4 just right. I wondered if the fuel feed was favouring the left side too much, but it was set up like the photos.

Back to the drawing board!
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Offline smee

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Re: CB750K6 Fuel Pipe Routing
« Reply #3 on: December 18, 2023, 06:47:28 AM »
Quote from: M 750K6 on December 12, 2023, 02:56:45 AM
Thanks for taking the time to do that, that's clear. Appreciated.

Before I took the head apart, I was struggling with cyls 1 & 2 running too rich, 3 perhaps a little rich and 4 just right. I wondered if the fuel feed was favouring the left side too much, but it was set up like the photos.

Back to the drawing board!

If your carbs are stock (and all stock brass OEM jetting), I'd pull the carbs and re-measure your floats. I have a K5 and I have mine set at 25.5 mm with no leaks from the bowls when on center or side stand. I'd then re-adjust the idle screws to stock setting and vacuum sync them again afterwards.
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Offline M 750K6

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Re: CB750K6 Fuel Pipe Routing
« Reply #4 on: December 18, 2023, 02:29:30 PM »
Quote from: smee on December 18, 2023, 06:47:28 AM
Quote from: M 750K6 on December 12, 2023, 02:56:45 AM
Thanks for taking the time to do that, that's clear. Appreciated.

Before I took the head apart, I was struggling with cyls 1 & 2 running too rich, 3 perhaps a little rich and 4 just right. I wondered if the fuel feed was favouring the left side too much, but it was set up like the photos.

Back to the drawing board!

If your carbs are stock (and all stock brass OEM jetting), I'd pull the carbs and re-measure your floats. I have a K5 and I have mine set at 25.5 mm with no leaks from the bowls when on center or side stand. I'd then re-adjust the idle screws to stock setting and vacuum sync them again afterwards.
👍
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