Honda CB750 Sandcast

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71
Engine Mechanical / Re: Which crankshaft bearings(mains)
« Last post by Sam on February 05, 2023, 10:47:53 pm »
The short answer is that those codes were relevant in 1969 when the engine was being built, but are not relevant now after many miles and years.

You need to use green plastigauge and figure out what bearings will give you the proper clearances. The place to start is usually green if you are unsure of what you have now.

You MUST get a shop manual. NOT an aftermarket manual. Only the original Honda manual (green cover) will do!

Good luck!
72
Engine Mechanical / Re: Which crankshaft bearings(mains)
« Last post by Wayne on February 01, 2023, 09:58:45 am »
Ditto what KP said however here’s a post that might help you.

http://cb750sandcastonly.com/smf_forum/index.php/topic,519.msg3424.html#msg3424
73
Engine Mechanical / Re: Which crankshaft bearings(mains)
« Last post by kp on January 31, 2023, 04:29:05 pm »
You need a workshop manual
74
General Discussion / Re: A couple restoration questions, paints & cleaning tank
« Last post by kp on January 31, 2023, 04:27:48 pm »
Molasses sure does work but for heavier rust. Vinegar for lighter rust. Usually a few days to a week followed by a cup or so of pool acid sloshed about for no more than a minute. Rinse thoroughly, then rinse again then fill with water and add a cup or more of bicarb soda to bring Ph to neutral. Dry the tank thoroughly then add a cup of penetrating oil and coat liberally to avoid further rusting. I use penatrol and it will never rust
Paint is personal choice. Powdercoat works and is not the nasty finish often claimed. Google powder coat and you will find the urban myths about powder coat busted
Powdercoat is a polyester urethane
2 Pac is the one many say to use. It's still nothing like the enamel of the original frame but will outlast you and me. Like powdercoat, it's a polyurethane and is a thicker than enamel finish. I usually have my frames painted in 2 pac with the addition of a flattening agent to take some of the bling out
I got this from the internet
Today, polyurethane coatings are applied using water-borne, solvent-borne, and high-solid or powder coating systems
75
Engine Mechanical / Which crankshaft bearings(mains)
« Last post by slyguy on January 31, 2023, 03:18:36 pm »
  I don’t understand, I have AAAAA on case & AABBA on crankshaft… Thanks for any input:)
76
General Discussion / A couple restoration questions, paints & cleaning tank
« Last post by slyguy on January 31, 2023, 03:09:03 pm »
Hi all, I joined 10 yrs ago when I got my 1033xxx  & then stored it. I want to repaint frame & engine cases first as well as clean out the gas tank first. I read where vinegar(white I assume) is used- just fill it up for a week? I read using molasses too so not sure? I’m wondering which paint & color for frame & cases too?
77
"88 Model Distinctions" / DATE CODES
« Last post by kp on January 27, 2023, 06:21:28 pm »
Posting this here as it seems the appropriate place
Kawasaki owners/restorers place emphasis on correct date codes. I've posted previously about date codes but I want to stress how important it is to keep original parts where possible. Nearly everything has a date code on early Honda machines. This includes such insignificant items such as rectifiers and coils
The following are the codes to look for
44 = 1969
4 = 1969
5 = 1970
9 = 1969 or September or 9th day. Depends on the location of the code so 999 (90909) could mean 9 Sept 1969
A, B, C = Oct, Nov, Dec
X, Y, Z = Oct, Nov, Dec
You may also see symbols on parts which at first sight are meaningless but in fact are Kanji or Katakana symbols which can represent numbers as date codes. I'm not about to list these as there are hundreds so google Katakana to see the numerous symbols. Often seen on early rod ends and engine parts
Here are some coils with date codes often missed by restorers. If the coils are beggared then not a lot you can do Even later manufactured coils have a code 1x could be Oct 81 or 91
78
New Member Introductions / Re: My early ko needs reincarnation
« Last post by Wayne on January 22, 2023, 02:17:49 pm »
Quote from: kp on January 21, 2023, 03:23:33 pm
Ya better off posting on the Facebook site. Nobody replies on this site much these days

You’re so right KP. This site has so much useful information for enthusiasts and purists. I’ve said it once and I’ll say it again. Someone should compile it into an e-book so it’s never lost.
79
New Member Introductions / Re: My early ko needs reincarnation
« Last post by kp on January 21, 2023, 03:23:33 pm »
Ya better off posting on the Facebook site. Nobody replies on this site much these days
80
New Member Introductions / My early ko needs reincarnation
« Last post by slyguy on January 20, 2023, 12:02:45 pm »
Hi guys! I joined this forum  10 yrs ago when I got & disassembled my 33xxx ko, then I got busy with my family & it went to the back burner lol.
Now I’d like to reassemble but torn between trying to keep it original or not? Should I spray paint frame, have it painted or just leave it as is?? I also disassembled engine & cleaned & washed cases & will be resealing stock engine. Build date is 4/70 with 9k or so on it & last registered in the early 80’s. Has the 4 into 1 carb cables etc. I rushed the disassembly & cracked up the pained air box:( which needs to be glued up somehow still. I worked for a master builder of these back in the early 70’s  who specialized in street racers at the time. Those were some good times!
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