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General Category => General Discussion => Topic started by: NCAmother on August 30, 2025, 04:49:29 PM

Title: Where do I get custom intake rubbers with keihin carbs?
Post by: NCAmother on August 30, 2025, 04:49:29 PM

Hi, I have a 77 lemans motor and a set of aluminum intakes.  I need the rubber intake hose from manifold to 39mm keihin fcr.  Does anyone have a vendor recommendation for custom intake rubbers or part number?  The outer diameter of the keihin carb is 48mm,  thank you very much

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: NCAmother on August 30, 2025, 05:10:46 PM

Oh, the intake spigot is 44mm, so it’s 44mm to 48mm rubber step up.  Can’t seem to find one, thanks

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: guzzisteve on August 30, 2025, 06:14:29 PM

I have used radiator hose before, that's what BMW airhead guys did back 40yrs ago. Not politically correct but works.

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: RinkRat II on August 30, 2025, 08:07:54 PM

    Your local hardware supply should carry a " no hub " connector in various pipe sizes that may fit the bill.  The rubber sleeve comes out and is pretty pliable.  A 1 1/2 no hub may work.
(https://i.ibb.co/5hSsSzT3/no-hub.jpg) (https://ibb.co/5hSsSzT3)


   Paul B :boozing:

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: Turin on August 30, 2025, 08:46:13 PM

(https://i.ibb.co/SXLw700D/se-frame-exhaust-1.jpg) (https://ibb.co/SXLw700D)

I used factory lemans 1000 intake manifolds and rubber connector. also did the same with the mikuni hsrs

(https://i.ibb.co/pvNZN1rY/20250131-200739.jpg) (https://ibb.co/pvNZN1rY)

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: John A on August 31, 2025, 01:21:34 AM

I used a BMW car radiator hose to mount PHF 30 mm carbs to intake stubs on a V65. The changed diameter at the end and fit perfectly. I had to buy two and cut the ends off. Back then they were about twenty bucks apiece. I don’t know the part number or what car they were used on so if you can get a parts guy to look for tapered radiator hoses you might find what you need. They told me they wouldn’t last, they were right. After thirty years they got hard, no longer pliable.

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: Cdn850T5NT on August 31, 2025, 11:52:03 AM

John A - 30 years is pretty good 😉.

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: NCAmother on August 31, 2025, 02:22:12 PM

Also, how close should I place the carb to the intake?  Is the rubber from the no hub connector fuel proof? Thanks

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: RinkRat II on August 31, 2025, 04:26:32 PM

     Most no hubs are neoprene so they're suitable for petroleum, acids, refrigerants etc.

     Paul B :boozing:

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: NCAmother on August 31, 2025, 04:34:14 PM

Quote from: RinkRat II on August 31, 2025, 04:26:32 PM

     Most no hubs are neoprene so they're suitable for petroleum, acids, refrigerants etc.

     Paul B :boozing:

Thanks, I think I’m gonna go this route as it won’t hurt my wallet so bad!

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: Antietam Classic Cycle on September 01, 2025, 10:16:59 AM

https://www.ebay.com/itm/225990567627

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: NCAmother on September 01, 2025, 02:45:57 PM

Quote from: Antietam Classic Cycle on September 01, 2025, 10:16:59 AM

https://www.ebay.com/itm/225990567627

Nice!  But I thought silicone wasn’t fuel proof?

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: 73 sport on September 01, 2025, 04:12:22 PM

    Flourosilicone is compatible with fuels. If in doubt about Charlies' recommendation, call the Mfgr.

Title: Re: Where do I get custom intake rubbers with keihin carbs?
Post by: 73 sport on September 01, 2025, 04:19:43 PM

      PS on my last. I use quality radiator hose for my carb hook-ups.