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Author Topic: "Poor Kid" 1981 CB750K - first build  (Read 24901 times)

Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #20 on: May 18, 2013, 14:54:28 »
Just kidding on the brakes. One of the carrier bolts was slightly loose and it was allowing the caliper to flex. The brake is now secure.

1981 CB750K (getting there now)


Offline Rich Ard

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #21 on: May 22, 2013, 00:17:10 »
Congrats on the progress. Before you go adding a failure point with a vacuum actuated petcock, consider capping the vacuum line from the carburetor instead. It means getting religious about turning the fuel off and on, but it's a simpler setup.
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175

Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #22 on: May 22, 2013, 00:19:16 »
Rich,

Why did you just remark on this?

Just wondering.



Offline Rich Ard

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #23 on: May 22, 2013, 00:25:05 »
Because I'm laying in bed reading threads. :) Why do you ask?
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175

Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #24 on: May 22, 2013, 00:39:21 »
I understand that a manual fuel valve is a great way to avoid failure of parts AND remove a variable in the fuel delivery system- however I am also not willing to compromise the functionality of my carbs.

If a manual petcock (single output, ON OFF RES) is left in the ON position, it will continue to flow fuel. Forever. Into my NON OE carbs, which came from a GSXR. This is the cause of fuel flooding bowls, then the passages, then the air filters and possibly, the engine. I may also move my vent lines to accommodate the pressure of fuel trying to escape.

The GSXR my carbs came from had a single output petcock with ON, PRI, and OFF positions. In ON, fuel flows ONLY when vacuum from a running engine goes to the petcock, actuating it. PRI is similar to a manual's ON function in that it will fill the float bowls without needing vacuum from the engine. OFF means fucking off. You know, but for readers we must lay this out.

Yeah, I could only use a manual OFF/ON valve in the line and save a ton of money. And I could also experience trouble with cold starts, contaminated oil, etc for the rest of the bike's life... Or I could spend a few more bucks and have these carbs running without variables. I've been attentive to detail on getting it road ready and the last things won't be rushed.

Also, no more exhaust leak- after some fabrication and maneuvering, the split keepers and exhaust are rock solid and sound great.

My reg rec problems continued, but I solved them. I will finalize wiring and do my *last bit of solder soon. No loss of functionality  in lights or heat in reg/rec this time. Anyone looking to swap an Electrosport Reg Rec for a SOHC to a DOHC can ask me now.

I nabbed a left crank cover from an Oregonian for only $30 online. Supreme. Fixes the oil leak from PO no. 1's drops. Will prevent me from parking lot oil stains at meets.

So when the petcock is done, I will be done, or at least riding until the end of the summer when I can start worrying about brake swaps and the REAL building. Don't tell me shit about the floats. I swear.

Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #25 on: May 22, 2013, 00:40:56 »
Rich I just have been arguing with everyone I meet today about this. It seemed like you had been listening to me talk to a coworker and decided to jump in via Tapatalk. Pretty sure you're the only one reading lol, not enough swapping and body work in here for people to care yet :(

1981 CB750K (getting there now)


Offline Rich Ard

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Re: Re: "Poor Kid" 1981 CB750K - first build
« Reply #26 on: May 22, 2013, 09:25:23 »
Rich I just have been arguing with everyone I meet today about this. It seemed like you had been listening to me talk to a coworker and decided to jump in via Tapatalk. Pretty sure you're the only one reading lol, not enough swapping and body work in here for people to care yet :(

1981 CB750K (getting there now)

Post ten pictures daily and we of the short attention span will gang up :)

Eliminating the vacuum line will not affect the performance of the carb, but you raise a number of reasons to use it - and good ones, at that. My preference is to KISS rather than retain something more complicated that can fail...but only to a degree. I could walk instead and be less likely to break down. :)
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175

Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #27 on: May 28, 2013, 13:54:10 »
As it stands, this will be the appearance of the bike for the season. I plan on making large changes after the first six months of riding, when I have more experience with this bike. So I'm only waiting on a petcock, a starter relay (I blew mine when stashing the wiring around the bike, don't ask) and I have to slap a tail light on it.

It ain't pretty but it is a start.

The bike runs well enough with only fuel from a length of line. I think the petcock will improve the fuel delivery so I can put a final tune on it. Unfortunately, I'm waiting a few weeks to budget for bills etc. So it will be just a few more days. Agonizing days.

1981 CB750K (dying to live)


Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #28 on: May 28, 2013, 13:54:57 »


1981 CB750K (messing up replies)


Offline kraptastic k

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Re: "Poor Kid" 1981 CB750K - first build
« Reply #29 on: May 28, 2013, 14:00:40 »
Also, that nasty oil leak is coming from the ignition cover/left crank cover, whatever it is. I snatched a solid replacement from a 79 750K for $34. Some would say it needs polish, I say it fits the general theme of the bike and it stays rough. So, altogether, I will run with the oil leak for about a week and then when all the old gunk is good and kicked up, I'll change the oil and the cover as well. No more oil leaks. Hell yeah!

1981 CB750K with Mikuni BST36SS carbs