Author Topic: K7 exhaust fitment on a K1 750? (Read 4900 times)

Nikkisixx · « **on:** January 02, 2016, 09:00:30 PM »

I've been eye-balling a stock 4 into 4 exhaust from a '77 model to fit on my earlier '70. Spigots and rear foot pegs I know are different. But what other fitment issues would I have? I've had a K8 and recall the swingarm is longer, but that the frame is basically the same?

754 · « **Reply #1 on:** January 02, 2016, 09:40:09 PM »

Footpeg mounts are different, and maybe be different location fore or aft...

seanbarney41 · « **Reply #2 on:** January 02, 2016, 10:38:38 PM »

Quote from: Nikkisixx on January 02, 2016, 09:00:30 PM

I've been eye-balling a stock 4 into 4 exhaust from a '77 model to fit on my earlier '70. Spigots and rear foot pegs I know are different. But what other fitment issues would I have? I've had a K8 and recall the swingarm is longer, but that the frame is basically the same?

seems like this is pretty undocumented...spigots issue is easily swapped out I think, and passenger foot peg mount issue seems like it would be junior high level fabrication...as long as there are no serious CLUNKS

I should try this as I have K7/8 pipes and a K4 engine and frame sitting there waiting for love

but I am just not motivated, as those K7/8 pipes are kinda uggy, and weigh even more than the 300's/341's

754 · « **Reply #3 on:** January 03, 2016, 12:19:08 AM »

Lots of things on K7/K8 were heavier.. I dont know if you can get the baffles out, easily on them.

seanbarney41 · « **Reply #4 on:** January 03, 2016, 12:26:43 AM »

I think it would take some serious hackery...I'd rather be fast and quiet than fast and loud...cops and #$%*, you know...not much fast of any kind is going on with those pipes anyway

754 · « **Reply #5 on:** January 03, 2016, 12:31:26 AM »

I think they have them plates between pipes and peg mount... May be easy to sort out..

Nikkisixx · « **Reply #6 on:** January 03, 2016, 06:59:37 AM »

Thanks guys!

A set of HM300's would be tits but at $1600 plus another $300 for heat shields and rubber connectors and knick knacks, I'll go with the heavy ugly. The bike is a bit of a hooligan now with a big cam, 836, and port work. The 4 into 1 is nasty loud and often scares old ladies and children. This winter I'm going to chill her out with a set of 1st over jugs, smaller cam, and quiet exhaust. Damn I'm getting old.

Jr High Fabrication is about my level so I could probably pull it off. I just didn't want to be in the business of major modifications.

seanbarney41 · « **Reply #7 on:** January 03, 2016, 05:43:05 PM »

Nikki, I mocked 'em up on a K4 today. They should work fine but really look wrong, imo, as the k7/8 bikes have a longer wheelbase, so you kinda end up with this crazy batmobile look with 4 BIG ole megas sticking out the back pretty far.
You will have to remove your stock spigots and will need the K7/8 collars and split collars plus studs instead of the pan head screws that your spigots use. Head pipes fit the frame just fine and no interference with rider pegs or brake pedal. Of course you will have to make or modify brackets to attach at the passenger peg. I will try to get some pics up sometime soon.

Nikkisixx · « **Reply #8 on:** January 03, 2016, 05:57:57 PM »

Hey seanbarney41 I really appreciate you doing that!

Id rather not have a goofy looking setup, so I may settle for a quieter 4 into 1. I've had and liked Kerkers in the past and see they are still available. Are they the same decent quality they used to be?

I recall the HM300's being $1200 all in. But then I recall used Japanese bikes selling for $1 per cc so there goes my paradigm shifting again!

Stev-o · « **Reply #9 on:** January 03, 2016, 06:46:47 PM »

+1 ... K7-8 exhaust would look goofy. Have you seen our new option??

http://www.ebay.com/itm/Full-4-1-Exhaust-System-Classic-Muffler-Stainless-Silencer-CB750-SOHC-69-76-/171660532027?fits=Model%3ACB750&hash=item27f7c3d93b:g:si8AAOSwQPlV8dux

Listing states it fits '69-'76, but maybe with some high school fab work it could fit!
You cannot beat the value....

Nikkisixx · « **Reply #10 on:** January 04, 2016, 07:45:41 AM »

Haha! Great minds and all that Stev-o - I found that last night while researching options. That price is ridiculous cheap for a stainless exhaust. Reviews from other SOHC members are positive, and it seems it would have a nice mellow tone. Probably the winner for me, until my rich uncle kicks the bucket and money grow on trees.

Stev-o · « **Reply #11 on:** January 04, 2016, 07:57:38 AM »

Quote from: Nikkisixx on January 04, 2016, 07:45:41 AM

Haha! Great minds and all that Stev-o -

That price is ridiculous cheap for a stainless exhaust.

Agreed. It almost fits into that "if it seems too good to be true.." saying, but reviews are very good.

I may buy one too once my exhaust supply runs out.

madmtnmotors · « **Reply #12 on:** January 04, 2016, 08:25:54 AM »

Quote from: Stev-o on January 03, 2016, 06:46:47 PM

+1 ... K7-8 exhaust would look goofy. Have you seen our new option??

http://www.ebay.com/itm/Full-4-1-Exhaust-System-Classic-Muffler-Stainless-Silencer-CB750-SOHC-69-76-/171660532027?fits=Model%3ACB750&hash=item27f7c3d93b:g:si8AAOSwQPlV8dux

Listing states it fits '69-'76, but maybe with some high school fab work it could fit!
You cannot beat the value....

I too am poised to pull the trigger on one (or more!) sets of these...

For that price I can afford to spring for new spigots so they will fit my K8's and F2's...

beemerbum · « **Reply #13 on:** January 04, 2016, 09:02:29 AM »

To my eye, these bikes seen from behind, need 4 very visible exhausts. Nothing else conveys the essence of these wonderful machines.

Restoration Fan · « **Reply #14 on:** January 04, 2016, 11:00:39 AM »

Quote from: beemerbum on January 04, 2016, 09:02:29 AM

To my eye, these bikes seen from behind, need 4 very visible exhausts. Nothing else conveys the essence of these wonderful machines.

On a stock bike, I agree with you. On a cafe'd style bike, 4-1 is best.

I will say this though: on my K8, the single most comments I get from people are, "I've never seen four separate pipes like that. That looks awesome."

seanbarney41 · « **Reply #15 on:** January 04, 2016, 01:57:37 PM »

Quote from: Restoration Fan on January 04, 2016, 11:00:39 AM

Quote from: beemerbum on January 04, 2016, 09:02:29 AM
To my eye, these bikes seen from behind, need 4 very visible exhausts. Nothing else conveys the essence of these wonderful machines.

I will say this though: on my K8, the single most comments I get from people are, "I've never seen four separate pipes like that. That looks awesome."

agreed. Unfortunately, K8 pipes on a K6 or earlier bike look ridiculous.

Stev-o · « **Reply #16 on:** January 04, 2016, 02:11:53 PM »

Quote from: seanbarney41 on January 04, 2016, 01:57:37 PM

Quote from: Restoration Fan on January 04, 2016, 11:00:39 AM
Quote from: beemerbum on January 04, 2016, 09:02:29 AM
To my eye, these bikes seen from behind, need 4 very visible exhausts. Nothing else conveys the essence of these wonderful machines.

I will say this though: on my K8, the single most comments I get from people are, "I've never seen four separate pipes like that. That looks awesome."

agreed. Unfortunately, K8 pipes on a K6 or earlier bike look ridiculous.

I dont care for the K7-8 pipes at all, they look nice but the sound has "no balls".

I had a beautiful all original K8 in great cond, that I bought for a song. The exhaust was the one thing I did not like about it and was not about to mod that particular bike.
Sold it.

PeWe · « **Reply #17 on:** January 04, 2016, 02:30:38 PM »

HM300 replica sounds nice on my bike with mod engine. I guess same sound as the old HM300. No baffles that restrict the engine.
I had a 4-1 for a K7 for many years ago. Removed spigots, used K7 ex clamps, bolts. Rear mount needed to have a bracket that raised the mount about 4". Ok with the 4-1, 4-4 must be too much problems. The Hm300-341 exhausts have a perfect fit, maybe the later K7 have the same and problems with fitment on an older frame.

My rear bolts holding 2 pipes and footpeg on each side have tight fit.

Go for a HM300 set

Desert-SOHC · « **Reply #18 on:** January 05, 2016, 10:22:26 AM »

Quote from: beemerbum on January 04, 2016, 09:02:29 AM

To my eye, these bikes seen from behind, need 4 very visible exhausts. Nothing else conveys the essence of these wonderful machines.

yup..............

Wobbly · « **Reply #19 on:** January 05, 2016, 10:54:04 AM »

I like the cleaner look of the K7 exhaust. And as far as its sound goes...What sound? Well, can't have it all.

Nikkisixx · « **Reply #20 on:** January 20, 2016, 04:44:52 PM »

Well fellas, I didn't win the lottery so I am waiting for you to send a set of stock HM300s to me. In return I'll post a bunch of pics for you to look at.

Meanwhile I got a set of the Delkevic stainless pipes. First impression is positive. These look nice and as soon as the temp in the garage is well into the double digits I'll hook them up and report back.

Restoration Fan · « **Reply #21 on:** January 20, 2016, 05:25:08 PM »

Quote from: Nikkisixx on January 20, 2016, 04:44:52 PM

Well fellas, I didn't win the lottery so I am waiting for you to send a set of stock HM300s to me. In return I'll post a bunch of pics for you to look at.

Meanwhile I got a set of the Delkevic stainless pipes. First impression is positive. These look nice and as soon as the temp in the garage is well into the double digits I'll hook them up and report back.

Just use some of your residuals from Motley Crue, dude!

seanbarney41 · « **Reply #22 on:** January 21, 2016, 07:03:36 PM »

Finally got around to uploading some pics of the K7/8 pipes on a K4...
everything fits fine here...

DSCN0967 by Sean Barney, on Flickr
no issues with footpeg or brake pedal

DSCN0968 by Sean Barney, on Flickr
here is how the bracket meets the passenger peg...this is where things get custom

DSCN0972 by Sean Barney, on Flickr

DSCN0973 by Sean Barney, on Flickr
the deal breaker imo...looks wacky

DSCN0966 by Sean Barney, on Flickr
not bad in back

DSCN0974 by Sean Barney, on Flickr

Stev-o · « **Reply #23 on:** January 21, 2016, 09:04:59 PM »

Agreed, looks wacky

madmtnmotors · « **Reply #24 on:** January 22, 2016, 05:54:26 AM »

Quote from: Stev-o on January 21, 2016, 09:04:59 PM

Agreed, looks wacky

Might have something to do with that wacky gold flake tailpiece...

seanbarney41 · « **Reply #25 on:** January 22, 2016, 01:00:42 PM »

Quote from: madmtnmotors on January 22, 2016, 05:54:26 AM

Quote from: Stev-o on January 21, 2016, 09:04:59 PM
Agreed, looks wacky

Might have something to do with that wacky gold flake tailpiece...

I know it looks crappy half mocked up on there, but that is part of a legit Read Titan body kit

cb650PK · « **Reply #26 on:** January 23, 2016, 06:26:32 AM »

Quote from: seanbarney41 on January 22, 2016, 01:00:42 PM

Quote from: madmtnmotors on January 22, 2016, 05:54:26 AM
Quote from: Stev-o on January 21, 2016, 09:04:59 PM
Agreed, looks wacky
If you don't like it, may be those pipes would look better on my K7

Might have something to do with that wacky gold flake tailpiece...
I know it looks crappy half mocked up on there, but that is part of a legit Read Titan body kit

seanbarney41 · « **Reply #27 on:** January 23, 2016, 08:13:58 AM »

mdmtnmotors, those pipes are available, they have just been hangin' around my shop and nobody really knows who they belong to. They do have some serious issues...battery side did not just get a few drips of acid, it looks like a whole car sized battery exploded on 'em. Both pipes on that side the chrome is ruined. One pipe on the other side has small rust through and there is something rattling around inside. Overall, they seem super solid. I would love for somebody that can use these to have them. I have no desire to own a stock K7/8.

madmtnmotors · « **Reply #28 on:** January 23, 2016, 09:32:39 AM »

Got any picts of the damaged pipes?

I'd really like to see picts of that Titan body kit, even if it's just a mock up!

Nikkisixx · « **Reply #29 on:** January 23, 2016, 02:35:53 PM »

Yes indeed that is a bit goofy hanging out almost past the tire. Glad you talked me out of it! Thanks for taking the time and posting pics. Is that an interceptor in the background?

seanbarney41 · « **Reply #30 on:** January 23, 2016, 05:55:45 PM »

Quote from: madmtnmotors on January 23, 2016, 09:32:39 AM

Got any picts of the damaged pipes?

I'd really like to see picts of that Titan body kit, even if it's just a mock up!

not sure I want to show you pics of the pipes, cuz then I might have to figure out how to ship the dang things...no idea where I could get a box big enough for even one side

This will give you a rough idea...

DSCN0638 by Sean Barney, on Flickr
there is also a frame mounted half fairing that goes with it, and rearsets and clipons too. Nobody that has seen it likes the tailpiece, but I am gonna use it anyway, for historic preservation's sake at least. The 750 Honda lettering is just stickers and was added by the previous owner. I will be sure and do a project thread when I get into it.

seanbarney41 · « **Reply #31 on:** January 23, 2016, 06:01:11 PM »

Quote from: Nikkisixx on January 23, 2016, 02:35:53 PM

Yes indeed that is a bit goofy hanging out almost past the tire. Glad you talked me out of it! Thanks for taking the time and posting pics. Is that an interceptor in the background?

sure is...project thread here, if you are interested
http://forums.sohc4.net/index.php/topic,141697.msg1606433.html#msg1606433

madmtnmotors · « **Reply #32 on:** January 23, 2016, 06:19:56 PM »

Quote from: seanbarney41 on January 23, 2016, 05:55:45 PM

not sure I want to show you pics of the pipes, cuz then I might have to figure out how to ship the dang things...no idea where I could get a box big enough for even one side

This will give you a rough idea...
DSCN0638 by Sean Barney, on Flickr
there is also a frame mounted half fairing that goes with it, and rearsets and clipons too. Nobody that has seen it likes the tailpiece, but I am gonna use it anyway, for historic preservation's sake at least. The 750 Honda lettering is just stickers and was added by the previous owner. I will be sure and do a project thread when I get into it.

The tank and seat helps bring it together a little. Some of the vintage aftermarket stuff is pretty cool, like the Corbin Gentry seat I found recently. Looks like the tail piece would accommodate a longer swingarm? Were you going to repaint?

As for the pipes, my travels take me up to Lima, OH a few times a year, maybe I could go a little further...

seanbarney41 · « **Reply #33 on:** January 23, 2016, 06:45:43 PM »

Yeah, there is certainly room for a longer swingarm, although I doubt that was intended in the original design. Most of what your seeing is from camera angle.

I probably will have to repaint, as the fairing does not match and I doubt anyone alive is capable of matching that wild flake. Also the color has darkened, but probably not under the lettering, and the lettering has to go. I am thinking about coming up with a scheme to leave some of that gold flake.

Lima looks to be about 3-4 from Kalamazoo, and I could be persuaded to meet you halfway. I will get you some pics. Warning ya though, the acid damage is really ugly.

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Author Topic: K7 exhaust fitment on a K1 750? (Read 4900 times)

Wobbly