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Author Topic: 1982 CB750F... The resto-not  (Read 4224 times)

Online irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #50 on: Aug 07, 2018, 12:43:08 »


3 and 7 are fuel.
4 is vacuum
5 is air vent

Now to figure out what your 5th hose is.

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #51 on: Aug 07, 2018, 12:51:10 »
Now to figure out what your 5th hose is.

Yup, that's the question mark alright.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #52 on: Aug 07, 2018, 13:14:15 »
Ok, may be getting somewhere.  Hose 4 is apparently a float bowl vent.  Hose 5 is vent for the auto fuel valve.  Stands to reason then that both these hoses should be open at the ends.  If perhaps one (or both) of them is blocked then that could be causing the problem I guess.

"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #53 on: Aug 07, 2018, 20:59:24 »
Trying, trying hard not to look at today as a total fail.  There's a lesson in there somewhere - just need to dig it out.  And I'm digging deep.

Pulled the carbs again, re-routed the hoses and double checked everything before putting them back in the bike.  Hooked up the gas tank, turned on the the petcock and smelt gas - carb one was pissing gas out of the overflow tube.  Thought maybe it was a stuck float valve - gave the side of the carb a whack with a rubber mallet but it still overflowed.  Figured fuck it - I'll try starting the bike and see what gives, and that was when problem two arrived.

The bike wouldn't fire, instead I heard a rapid clicking from the starter relay/solenoid and then a rather disconcerting mechanical clank from somewhere.  Killed it, thought maybe the 30A fuse had blown so switched it out with my other CB, to no avail.  Then switched out the whole starter relay/solenoid assembly with the other CB - still just a rapid clicking, another clank and that was all she wrote.

The bike fired up fine before I pulled the carbs.  Ran rough, but it fired.  I'm sure the starter problem doesn't have anything to do with the carb work I did but have no idea what to do or check next.

Any pointers?

Edited to add - I'm pretty sure it's not the battery as it was charged, but I have the thing on trickle anyway and will try it again in a few hours.  Could the clutch switch have something to do with it?  The bike is in neutral, at least the neutral light is on.
« Last Edit: Aug 07, 2018, 21:15:46 by The Jimbonaut »
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Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #55 on: Aug 07, 2018, 21:16:19 »
Battery voltage was about 11.9V
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Online irk miller

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #56 on: Aug 07, 2018, 21:43:41 »
Battery voltage was about 11.9V
That's basically discharged.  Charge it up and try again.  If it doesn't hold charge, get you a new battery.

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #57 on: Aug 07, 2018, 21:57:39 »
Cheers man, really appreciate the help as always. Had the battery on trickle and sure enough it fired up after dinner. I thought 11.9V sounded pretty much fully charged but I now know better.

Gas is still pissing out of carb 1. More rubber mallet whacks but no dice.


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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #58 on: Aug 07, 2018, 22:07:37 »
Try blowing through the fuel line from the tank.  If it's debris on the float, it may clean it off.  Works more than it doesn't.

Offline The Jimbonaut

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Re: 1982 CB750F Resto-mod. At least that's the current plan.
« Reply #59 on: Aug 07, 2018, 22:13:31 »
Disconnect the fuel line from the gas tank and blow through the thing?  I'll give it a go mate.

When the bike did start it idled like absolute shite - the revs climbed and climbed until I was sure a disgruntled neighbour was going to launch a frying pan at my head.   :-\

I'm starting tho think these carbs may be in need of more than just a rudimentary clean.  So plan B will be to pull the carbs from the other CB and switch them out, just for long enough to get the bike through its safety exam. 
« Last Edit: Aug 07, 2018, 22:20:19 by The Jimbonaut »
"I'm telling you Donnie, nuthin' but nuthin' but right"