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Offline Sdsbassist

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  • Gus, Austin, MN.
Options.
« on: August 23, 2012, 02:58:21 PM »
$400 dollar CB750.

Leakes oil on head by exhaust entry
Leakes oil by lowet end gasket (one the goes horizontal across
Leaks oil somewhere near neutral wires.

Is it better to:

Rebuild? Any specialized tools needed? Cost?
Get a used one? Is that a gamble also?
Part out?

I always appreciate the opinions of those on the forum.
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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline goldarrow

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Re: Options.
« Reply #1 on: August 23, 2012, 03:10:35 PM »
Is this the bike you own? Or you're trying to get? How good or bad does it look?
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Life Is Full Of Challenges - And My Backyard Is Full Of SOHC4's

CB550 K0
CB750 K0, K2, K23 JDM, K45, K5
And the little ones z50r, xr50r, st90


750k5 http://forums.sohc4.net/index.php?topic=114817.0

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Options.
« Reply #2 on: August 23, 2012, 03:26:44 PM »
I own it.

Here are some pics from a previous post:

 http://forums.sohc4.net/index.php?topic=111136.0
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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Tews19

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Re: Options.
« Reply #3 on: August 23, 2012, 05:05:29 PM »
This is your bike in as the avatar correct? Bike runs currently correct? If you only have 400 invested and like the way she drives minus the oil seepage rebuild/ fix the head gasket...

It's a gamble buying another engine if you do not know the history or if it evens runs.

Sounds like maybe the bike may irrate you more then a love hate relationship. if you are looking to spend money and like the CB's maybe spend some money and buy a different. All upto you
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline elbowdeep

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Re: Options.
« Reply #4 on: August 23, 2012, 05:36:09 PM »
show me an old one that doesnt leak if it hasnt already been apart (really no guarantee either).  Pretty sure it would be rare if it didnt leak
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Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Options.
« Reply #5 on: August 23, 2012, 05:58:49 PM »
I like the looks of the rat. I have some experience rebuilding carbs, some cycle maitenence. What would be the estimated cost and time for gasket fixes. (the head gasket worries me a little ita the one near the bottom thats more frightrning.
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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline elbowdeep

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Re: Options.
« Reply #6 on: August 24, 2012, 04:04:14 AM »
gasket kit-  maybe 60 or 70 for a good one.  make sure to get the rubber "nickles" and GLUE THEM IN with threebond or they leak oil (how would i know this  :D)  Time?  Time is free...

is it the cylinder base gasket that leaks?  if so, its not too hard to pull the cylinders off at that point.  Great time to lightly hone the bores and re ring too. 

Talk to cycle x and tell them what youre doing.  he put together a gasket kit for me sans base gasket but with all the seals that I would need for the head gasket on up.  good price too if i remember
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