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Author Topic: 1982 CB750F Resto-mod. At least that's the current plan.  (Read 1374 times)

Offline The Jimbonaut

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1982 CB750F Resto-mod. At least that's the current plan.
« Reply #40 on: Aug 07, 2018, 00:02:15 »
So I shouldnít loop one hose like I did? Both hoses should be connected to the carb and open at their other ends? Strange if not, because that hose is looped on my other CB


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Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #42 on: Aug 07, 2018, 01:03:29 »
Man thatís really helpful - thanks mate. Iíll re-route those hoses and see what gives.

Really weird though. Guess the other CB threw me with its hoses and their routing. Could that routing be so different?


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Offline irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #43 on: Aug 07, 2018, 08:37:50 »
I have no idea.  Maybe a seal leaks on the other one, so it pulls air through the seal and seems routed right.  Funny things happen. When I got my 1979 C10 from my dad, it started making a clicking sound while I drove the 2.5 hours home.  It ran and drove fine, just made that sound.  Turns out, my dad had the vacuum hoses routed wrong, so it was sucking air through the main seal.  He only drove it around his property and occasionally took a load of metal a couple miles up the road to the scrap yard, so the motor never heated up enough to do that for him.

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #44 on: Aug 07, 2018, 11:42:37 »
Thing is Irk, that diagram shows four hoses but as it sits my carb has five -



My (limited) understand would suggest that -

1. is a fuel line from the auto fuel cock to the carb body
2. not sure but I'm pretty sure it's in the right place
3. is a fuel line from the gas tank to the auto fuel cock
4. is a hose from the carb body (in between carb 2 & 3) to somewhere
5. is a hose from the auto fuel cock to ??

So I've got five hoses, but the diagram only shows 4.  Hose 4 and 5 are the mystery meat.
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Offline irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #45 on: Aug 07, 2018, 11:55:40 »
Thing is Irk, that diagram shows four hoses but as it sits my carb has five -




The diagram only shows hoses attached to the auto fuel valve.  What you have marked 4 doesn't go to the fuel valve, so it's not in that diagram.  I'm guessing that 4 is attached to a nipple on your #2 carb, which is the carb that holds the pumper.  As such, I'm also guessing that your pumper runs directly off the tank, and not through the auto fuel valve.  Just guessing by what I can see in the pics.

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #46 on: Aug 07, 2018, 12:14:02 »
Ah, good catch.  So would that mean that line 4 would - along with line 3 - connect directly to the petcock on the gas tank? 
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Offline irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #47 on: Aug 07, 2018, 12:22:58 »
Ah, good catch.  So would that mean that line 4 would - along with line 3 - connect directly to the petcock on the gas tank?
Right

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #48 on: Aug 07, 2018, 12:28:57 »
If thatís the case then I think I smell a snafu. I canít tell from the VB number on these carbs where they originally come from, but I donít think theyíre from an F model. And now I have a K model tank. The petcock threads on the tank seem to be different for each model and year, and the only petcock I can find that fits this K tank only has one outlet.




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Offline irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #49 on: Aug 07, 2018, 12:37:31 »
If thatís the case then I think I smell a snafu. I canít tell from the VB number on these carbs where they originally come from, but I donít think theyíre from an F model. And now I have a K model tank. The petcock threads on the tank seem to be different for each model and year, and the only petcock I can find that fits this K tank only has one outlet.




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It appears the K and F share a part number on the petcock, so we know that's at least correct.     16950-MA4-771

What I do in parts searches is borrow Western Hills' site and do an OEM part search:

https://www.westernhillshondayamaha.com/index.htm