Topic: Interesting: 750K intake hoses from CI

[HondaMan]

While I don't know their country of origin, CruzinImage is offering 750K7/8 intake hoses:

https://www.ebay.com/itm/145798880179?itmmeta=01K0CQS6ZGP82QJFT5D2DWHKMS&hash=item21f24a5bb3:g:YvIAAOSw9mFWKIjU

...and K1-K6 intake hoses:
https://www.ebay.com/itm/166786813205?itmmeta=01K0CR2W9XX1V0ZKQW0MR9YYWS&hash=item26d544cd15:g:s64AAOSwl4lbtbrG

[Dime]

I could use a set of them when the time comes. Hopefully they have them on their website cause that link doesn't ship to Canada

Sent from my SM-S721W using Tapatalk

[denward17]

Interesting, not a bad price either....

I think I got mine from vintagecb750 a couple of years ago, seems like they were around $100 or so.

Can't be many people making these anymore, probably all come from the same source, wherever that may be.

[PeWe]

I have tested Cruzin Image intake rubbers on my K6.
I saw cracks after a season when taking off the carbs due to head work or more so Honda stock ordered.

Cracks seen inside where head spigots ends (or starts).

They do not cost much so try them.

Their clutch plates are good though.
And pistons....

I ordered CB750 oil seals for engine too.

[Jerry Rxman Griffin aka MuthaF'er]

When I mentioned to Cruzin that 1 of my set was longer than the others he blocked me. No outcome otherwise. I think this is/was his S.O.P. for any negativity or disagreements.

[scottly]

From the sellers description for the K7-8 parts:
ATTENTION-
These parts doesn't much to USA Models.
different a shape,design and sizes for included all parts.

[madmtnmotors]

When I mentioned to Cruzin that 1 of my set was longer than the others he blocked me. No outcome otherwise. I think this is/was his S.O.P. for any negativity or disagreements.

I ordered carb insulator/intake boots from another online retailer and found that each boot was ever so slightly longer than the one before it, i.e. 4>3>2>1 by about 1/16" each so that #4 was indeed about 1/4" longer than #1. The carb rack was at an angle and was able to measure the 1/4" difference between 1 and 4. Even with new airbox boots (soft and pliable and Honda brand) I still had to oval out the airbox mounting bracket on the #4 side to be able to mount the stock airbox.

[HondaMan]

When I mentioned to Cruzin that 1 of my set was longer than the others he blocked me. No outcome otherwise. I think this is/was his S.O.P. for any negativity or disagreements.

I ordered carb insulator/intake boots from another online retailer and found that each boot was ever so slightly longer than the one before it, i.e. 4>3>2>1 by about 1/16" each so that #4 was indeed about 1/4" longer than #1. The carb rack was at an angle and was able to measure the 1/4" difference between 1 and 4. Even with new airbox boots (soft and pliable and Honda brand) I still had to oval out the airbox mounting bracket on the #4 side to be able to mount the stock airbox.

Which bike was this for, Wilbur?

[madmtnmotors]

Which bike was this for, Wilbur?

CB750K8. It was either Vintage CB750 or CB750.com IIRC. They seem to be holding up OK other than the variations in length. At less than $100 per set of four they could be considered a maintenance item and replaced periodically, especially since the K7/K8/F2/F3 are NLA from Honda 

I did manage to find a couple Honda originals #1 and #3 for these later models from JTMarks ebay store, but the #2 and #4 Honda originals are nowhere to be found. I did find these for $50 per set of four:

https://www.ebay.com/itm/195332648492

I have not had a chance to check fitment, but for $50 I think I can make them work! 

[HondaMan]

Which bike was this for, Wilbur?

CB750K8. It was either Vintage CB750 or CB750.com IIRC. They seem to be holding up OK other than the variations in length. At less than $100 per set of four they could be considered a maintenance item and replaced periodically, especially since the K7/K8/F2/F3 are NLA from Honda 

I did manage to find a couple Honda originals #1 and #3 for these later models from JTMarks ebay store, but the #2 and #4 Honda originals are nowhere to be found. I did find these for $50 per set of four:

https://www.ebay.com/itm/195332648492

I have not had a chance to check fitment, but for $50 I think I can make them work! 

Good to know! Someone just asked me how I felt about [trying to] restoring his K8. When I did the last one, we had just started seeing those aftermarket ones that lasted about 8 months (yep, did those), leading to the search for some OEM versions. That was in 2015, IIRC, and Honda briefly made them again after we 'nudged' them several times from the forum here.Those are still on it, doing fine.

Just got a 750K4 to love on for someone: it needs new hoses, too. They appear to be the Tourmaster version from about 8 years ago, already too loose at both ends, causing major "carb problems" that are just intake leakage troubles.

[madmtnmotors]

There is anecdotal reports that the 1 and 3 boots can be flipped for the 4 and 2 positions. I ordered two 1's and two 3's from jtmarks so I'll give it a try and see what happens.

[HondaMan]

There is anecdotal reports that the 1 and 3 boots can be flipped for the 4 and 2 positions. I ordered two 1's and two 3's from jtmarks so I'll give it a try and see what happens.

That's true for the earlier bikes, at least. Haven't tried that with the K7/8, though?

[scottly]

There is anecdotal reports that the 1 and 3 boots can be flipped for the 4 and 2 positions. I ordered two 1's and two 3's from jtmarks so I'll give it a try and see what happens.

That's true for the earlier bikes, at least. Haven't tried that with the K7/8, though?

I verified it also works for stock K7 boots the last time this subject came up.

[madmtnmotors]

I verified it also works for stock K7 boots the last time this subject came up.

 

[Stev-o]

Just got a 750K4 to love on for someone: it needs new hoses, too.

Hey HM...dont think I've ever heard of the "INTAKE SET INSULATOR" called hoses? 
I had something else in mind when I clicked on the thread.

[rotortiller]

dont think I've ever heard of the "INTAKE SET INSULATOR" called hoses?

I have heard them called intake hoses, intake boots, insulators, intake pipes, intake manifolds boots, intake manifold insulator boots, Carburetor Rubber Manifold Inlet Tube Pipe. Come to think about it is just a custom hose with hose clamps employed to secure it.

[HondaMan]

There is anecdotal reports that the 1 and 3 boots can be flipped for the 4 and 2 positions. I ordered two 1's and two 3's from jtmarks so I'll give it a try and see what happens.

That's true for the earlier bikes, at least. Haven't tried that with the K7/8, though?

I verified it also works for stock K7 boots the last time this subject came up.

Cool, good to know!
...someone around here asked me to [think about] resto-ing his K8 for him.
I'm currently rescuing a nice K4 from a Colorado hacker's "resto" job.

[HondaMan]

Just got a 750K4 to love on for someone: it needs new hoses, too.

Hey HM...dont think I've ever heard of the "INTAKE SET INSULATOR" called hoses? 
I had something else in mind when I clicked on the thread.

Yeah, sorry, it's a 1970's euphemism. We called 'em "hoses".
 

[willbird]

I bought a set of 4:1 boots early into awakening my K2. Did not "know" at the time about 4:1. They lasted a year and then one split all the way around on a ride, it was a good thing I made it home. Noticed bike running weird and then picked up on that split. From then on I call them "4 into 5" intake isolators LOL because they are likely to split. Got NOS Honda ones from JT Marks.


Bill

[HondaMan]

I bought a set of 4:1 boots early into awakening my K2. Did not "know" at the time about 4:1. They lasted a year and then one split all the way around on a ride, it was a good thing I made it home. Noticed bike running weird and then picked up on that split. From then on I call them "4 into 5" intake isolators LOL because they are likely to split. Got NOS Honda ones from JT Marks.


Bill

That's what happened to a set on a bike that came to me for 'repair' (fouling plugs a lot) about 3 years ago. One of the hoses was split about 160 degrees on the underside almost like a slice. It took me a while to find it: I'd never seen that before. Then I noticed they have Chinko lettering on them, but didn't know they were coming from 4into1 at the time. I also got a set from JTMarks for that one.

Were your JTMarks OEM ones old enough hoses that the old hose clamps still fit them snugly? The modern ones are about 2mm smaller diameter (thickness is different) and the OEM clamps don't seal well. I had to make some brass strips to fill in the grooves about 320 degrees around, then slipped the OEM clamps over them to make it seal. The owner didn't want the Oetiker solution (because the clamps are ugly, despite working perfectly).

[willbird]

I bought a set of 4:1 boots early into awakening my K2. Did not "know" at the time about 4:1. They lasted a year and then one split all the way around on a ride, it was a good thing I made it home. Noticed bike running weird and then picked up on that split. From then on I call them "4 into 5" intake isolators LOL because they are likely to split. Got NOS Honda ones from JT Marks.


Bill

That's what happened to a set on a bike that came to me for 'repair' (fouling plugs a lot) about 3 years ago. One of the hoses was split about 160 degrees on the underside almost like a slice. It took me a while to find it: I'd never seen that before. Then I noticed they have Chinko lettering on them, but didn't know they were coming from 4into1 at the time. I also got a set from JTMarks for that one.

Were your JTMarks OEM ones old enough hoses that the old hose clamps still fit them snugly? The modern ones are about 2mm smaller diameter (thickness is different) and the OEM clamps don't seal well. I had to make some brass strips to fill in the grooves about 320 degrees around, then slipped the OEM clamps over them to make it seal. The owner didn't want the Oetiker solution (because the clamps are ugly, despite working perfectly).

I used the stainless worm clamps highly recommended here on the JT Marks parts. They are a HUGE upgrade as long as you do not tighten them more than snug.

[HondaMan]

I bought a set of 4:1 boots early into awakening my K2. Did not "know" at the time about 4:1. They lasted a year and then one split all the way around on a ride, it was a good thing I made it home. Noticed bike running weird and then picked up on that split. From then on I call them "4 into 5" intake isolators LOL because they are likely to split. Got NOS Honda ones from JT Marks.


Bill

That's what happened to a set on a bike that came to me for 'repair' (fouling plugs a lot) about 3 years ago. One of the hoses was split about 160 degrees on the underside almost like a slice. It took me a while to find it: I'd never seen that before. Then I noticed they have Chinko lettering on them, but didn't know they were coming from 4into1 at the time. I also got a set from JTMarks for that one.

Were your JTMarks OEM ones old enough hoses that the old hose clamps still fit them snugly? The modern ones are about 2mm smaller diameter (thickness is different) and the OEM clamps don't seal well. I had to make some brass strips to fill in the grooves about 320 degrees around, then slipped the OEM clamps over them to make it seal. The owner didn't want the Oetiker solution (because the clamps are ugly, despite working perfectly).

I used the stainless worm clamps highly recommended here on the JT Marks parts. They are a HUGE upgrade as long as you do not tighten them more than snug.

I think I'll go look for those! While I like the very-adjustable Oetiker clamps, they are expensive. And if you don't have a Vetter with Lowers, they aren't pretty, either.

But they sure work good!

[willbird]

I bought a set of 4:1 boots early into awakening my K2. Did not "know" at the time about 4:1. They lasted a year and then one split all the way around on a ride, it was a good thing I made it home. Noticed bike running weird and then picked up on that split. From then on I call them "4 into 5" intake isolators LOL because they are likely to split. Got NOS Honda ones from JT Marks.


Bill

That's what happened to a set on a bike that came to me for 'repair' (fouling plugs a lot) about 3 years ago. One of the hoses was split about 160 degrees on the underside almost like a slice. It took me a while to find it: I'd never seen that before. Then I noticed they have Chinko lettering on them, but didn't know they were coming from 4into1 at the time. I also got a set from JTMarks for that one.

Were your JTMarks OEM ones old enough hoses that the old hose clamps still fit them snugly? The modern ones are about 2mm smaller diameter (thickness is different) and the OEM clamps don't seal well. I had to make some brass strips to fill in the grooves about 320 degrees around, then slipped the OEM clamps over them to make it seal. The owner didn't want the Oetiker solution (because the clamps are ugly, despite working perfectly).

I used the stainless worm clamps highly recommended here on the JT Marks parts. They are a HUGE upgrade as long as you do not tighten them more than snug.

I think I'll go look for those! While I like the very-adjustable Oetiker clamps, they are expensive. And if you don't have a Vetter with Lowers, they aren't pretty, either.

But they sure work good!

Oh Sorry I was referring to the Oetiker clamps, was not remembering the name off hand. They are not a perishable part, one way to justify buying and crying once :-).

Bill

[Alan F.]

Could anyone post a size or part number for the Oetiker clamps? I used those daily at work in the early 90s and they were never a failure point.

[HondaMan]

Could anyone post a size or part number for the Oetiker clamps? I used those daily at work in the early 90s and they were never a failure point.

They are #050-9, here:
https://www.aircraftspruce.com/catalog/appages/oetiker.php?clickkey=3015657

I put them on mine in 2006. They haven't needed a touch nor a tightening since. Be a little careful though: a few years later I put them on a friend's bike and overtightened in my zeal to "fix" his still-original hoses: going too tight cracked one of the hoses. These type of clamps are airworthy and WILL work, with tremendous 'grip'.