Author Topic: Fuel Line Size  (Read 448 times)

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Offline Vintageguy

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Fuel Line Size
« on: May 30, 2023, 11:18:04 AM »
Anyone know offhand what size fuel line for 1978 750F? Think it is 1/4" but not sure. Thanks.

Offline Alan F.

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Re: Fuel Line Size
« Reply #1 on: May 30, 2023, 11:46:04 AM »
Stock was 5.5mm (.216") it's available online but it's not particularly cheap.

Offline Vintageguy

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Re: Fuel Line Size
« Reply #2 on: May 30, 2023, 01:15:05 PM »
Seems as though 6mm would work?

Offline RAFster122s

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Re: Fuel Line Size
« Reply #3 on: May 30, 2023, 01:29:13 PM »
Not without leaks if 5.5mm is stock, 6mm is gonna leak
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Offline grcamna2

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Re: Fuel Line Size
« Reply #4 on: May 30, 2023, 01:47:11 PM »
The auto parts places sell 5.5mm vapor hose;I've used 3/16" hose which fits tight.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline ekpent

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Re: Fuel Line Size
« Reply #5 on: May 30, 2023, 05:12:22 PM »
The auto parts places sell 5.5mm vapor hose;I've used 3/16" hose which fits tight.
Think that is what I use also on 750's etc.. Bought a whole big spool of it when a hardware store was closing. It has worked well for me. Little warm up on the end with a heat gun and a little grease on the mounting nipples and its easier to get on or off and no leaks or clamps.

Offline PeWe

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Re: Fuel Line Size
« Reply #6 on: May 30, 2023, 08:54:00 PM »
Same spigot size as CB750 K0-K4 dual spigot petcocks?
I use 6mm hose by Gates, their Barricade. Work fine with mini clamps.
That setup has adapters to 8mm hose for the carbs spigots.

Another bike got a grey hose from Yamiya. That sit very tight with simple thread clamps included.
Take time to get off.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline grcamna2

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Re: Fuel Line Size
« Reply #7 on: May 30, 2023, 08:57:24 PM »
The auto parts places sell 5.5mm vapor hose;I've used 3/16" hose which fits tight.
Think that is what I use also on 750's etc.. Bought a whole big spool of it when a hardware store was closing. It has worked well for me. Little warm up on the end with a heat gun and a little grease on the mounting nipples and its easier to get on or off and no leaks or clamps.

I get Gates brand,it holds-up for about a year+ before it gets dried out because of ethanol.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline PeWe

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Re: Fuel Line Size
« Reply #8 on: May 31, 2023, 02:49:52 AM »
Gates Barricade hose should cope with that plus other chemicals.
That bike gets Shell V-Power with hopefully less ethanol.
Same hoses since early 2015 with countless of tank off-on since then. Not numbers of times...Dozens of times ;D
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline grcamna2

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Re: Fuel Line Size
« Reply #9 on: May 31, 2023, 09:26:09 AM »
Gates Barricade hose should cope with that plus other chemicals.
That bike gets Shell V-Power with hopefully less ethanol.
Same hoses since early 2015 with countless of tank off-on since then. Not numbers of times...Dozens of times ;D

I just checked Napa here locally and they have the 5.3mm/1/4" Gates Barricade fuel hose(not fuel injection)and they stock it.
Does that Gates Barricade hose resist Ethanol degradation ??
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline PeWe

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Re: Fuel Line Size
« Reply #10 on: May 31, 2023, 11:19:04 AM »
This is the one my blue K6 has
https://www.gates.com/gb/en/search.p.4219-000000-000000.html

Dual 6mm  hose from petcock.
Adapters to 8mm hose the carbs spigots.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Online HondaMan

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Re: Fuel Line Size
« Reply #11 on: May 31, 2023, 05:39:07 PM »
Search for "5.5mm fuel hose". You can get it in 2-ft lengths, usually.
I buy lots more...
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