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Author Topic: Air filter horns  (Read 652 times)

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Offline Slow2

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  • 1971 CB750, 1974 Cb750, 2004 Yamaha Roadstar chopp
Air filter horns
« on: April 27, 2023, 06:21:39 PM »
I just spent a frustrating afternoon trying to install the top half of the filter box on a 1975 CB750. All new OEM rubber, both on the carbs to head and filter to carbs. For the life of me, I can’t get the filter box top to line up with the carbs. I’ve got the offset at the top of the horns. I’m out of ideas!! Any help would be greatly appreciated!! Thanks!!

Ed
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Offline newday777

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Re: Air filter horns
« Reply #1 on: April 27, 2023, 06:57:03 PM »
I'm not at my shop so I can't take fresh pictures of my K5 for you but have a couple pictures of others that might help you.
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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, 2 K4, 2 K6, 1 K8
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 cooldrum

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Re: Air filter horns
« Reply #2 on: April 27, 2023, 07:34:41 PM »
 At the 18:00 mark he has the seams on the tubes all pointing straight up to the air box.  Although this is for a K2, I followed his suggestions for my K4 and they all lined up to the back of my carbs.  I did use genuine Honda intake insulators for everything and double checked the orientation of insulators at the head before the carbs went on. Hope this helps.
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Offline Slow2

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  • 1971 CB750, 1974 Cb750, 2004 Yamaha Roadstar chopp
Re: Air filter horns
« Reply #3 on: April 28, 2023, 03:01:41 AM »
I found that video and did exactly as he did, except the sealing part, and I’m using genuine Honda horns and boots. My carbs went back on fairly easy using a tie down strap to pull them in. Stu, I appreciate the pictures. It looks like the wider offset should be at the bottom. I’ll give that a shot this morning. This has been a surprise to me. I expected the carbs to be difficult but weren’t and did not expect trouble out of the air box. I’ve done this before, but it’s been a long time and I can’t remember squat anymore. Thanks for the help guys.

Ed
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Offline newday777

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Re: Air filter horns
« Reply #4 on: April 28, 2023, 03:24:45 AM »
Are you using a line coat of red grease so they slide on the carbs easier??
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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, 2 K4, 2 K6, 1 K8
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 Slow2

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  • 1971 CB750, 1974 Cb750, 2004 Yamaha Roadstar chopp
Re: Air filter horns
« Reply #5 on: April 28, 2023, 03:38:39 AM »
Stu, I don’t have any problems getting the horns on the carbs. They’re just always at the wrong angle! Plus the bolt up tab is too far back from the frame tab. I have considered greasing them up, just out of frustration. Do you seal the horns to the cover? Thanks for all your help!!

Ed
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Offline newday777

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Re: Air filter horns
« Reply #6 on: April 28, 2023, 04:12:46 AM »
I haven't bought any yet, about to though.
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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, 2 K4, 2 K6, 1 K8
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 Slow2

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  • 1971 CB750, 1974 Cb750, 2004 Yamaha Roadstar chopp
Re: Air filter horns
« Reply #7 on: April 28, 2023, 05:08:50 AM »
👍
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