1961 CB72 Project

LOUD MOUSE · Post by **LOUD MOUSE** » Sun Apr 30, 2017 2:28 pm

LOUD MOUSE wrote:The very early engines have a screen filter on the pump which didn't fit against the case at the top so HONDA placed a phenolic/plastic spacer there. (you can see the spacer on the grass)
The design change has a area under the screen to allow oil higher up to the pump so there isn't room/need for the spacer.
The screen is actually to remove OIL BUBBLES from the oil. (side effect does keep large items from getting into the pump).....................lm

Tim Allman wrote:Please enlighten us about the oil filter details. This is new to me.

G-Man wrote:Good question. I'll check through th evarious parts I have. It looks like it only needs 3mm or so but I didn't want to force it.

G

LOUD MOUSE wrote:Question.
Are you using the short filter or the later issue which allows MORE oil to the pump?. .................lm

G-Man wrote:Ha !

I thought you would be the only one to notice that, LM.

I couldn't get the oil pump to seat nicely with it on. More investigation needed. Pretty sure this was the pump and filter that belongs to the engine but I might have some mismatched parts.

G

LOUD MOUSE wrote:Great pic.
Even the oil pump extension. ................lm

More tomorrow - hopefully wheel building.

G

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LOUD MOUSE · Post by **LOUD MOUSE** » Sun Apr 30, 2017 3:18 pm

Wide end down to press on the flat top of the screen. ..................lm

G-Man wrote:Many thanks - LM

I managed to locate an early filter screen and a later (030) one.

Interesting that the manual shows the 'receiver' with the wide end at the top while my engine had it the other way up.

Do you know which is correct?

G

G-Man · Post by **G-Man** » Sun Apr 30, 2017 4:12 pm

OK - thanks for your help.

G

LOUD MOUSE wrote:Wide end down to press on the flat top of the screen. ..................lm

G-Man wrote:Many thanks - LM

I managed to locate an early filter screen and a later (030) one.

Interesting that the manual shows the 'receiver' with the wide end at the top while my engine had it the other way up.

Do you know which is correct?

G

LOUD MOUSE · Post by **LOUD MOUSE** » Sun Apr 30, 2017 6:24 pm

You are welcome. ..........lm

G-Man wrote:OK - thanks for your help.

G

LOUD MOUSE wrote:Wide end down to press on the flat top of the screen. ..................lm

G-Man wrote:Many thanks - LM

I managed to locate an early filter screen and a later (030) one.

Interesting that the manual shows the 'receiver' with the wide end at the top while my engine had it the other way up.

Do you know which is correct?

G

border0_3 · Post by **border0_3** » Sun Apr 30, 2017 9:33 pm

LM and G-Man, Some great info. You really are the Parts Catalogue, Maintenance Manual, Service Bulletins, Engineering Orders, Tech Specialist (and more) for the CL-CB 72-77s. Certainly on behalf of us Aussies - Thank you.

Graham, See you have THOR as a helper laying on the grass near your 61. :)

G-Man · Post by **G-Man** » Mon May 01, 2017 1:17 am

Border

It's good to have people who can share their knowledge. Honda call that part a 'receiver' but I'm still trying to work out why. It seems to be just a spacer, as LM says. I don't think it 'receives' or deflects any oil.

I have several "Thors". This one used for gently nudging the engine bolts into line..... :-)

I like working outside. It reminds me of those Honda works mechanics working in the paddock in the 1960s

G

border0_3 wrote:LM and G-Man, Some great info. You really are the Parts Catalogue, Maintenance Manual, Service Bulletins, Engineering Orders, Tech Specialist (and more) for the CL-CB 72-77s. Certainly on behalf of us Aussies - Thank you.

Graham, See you have THOR as a helper laying on the grass near your 61. :)

G-Man · Post by **G-Man** » Mon May 01, 2017 1:35 am

The bike is now resting in its build-up place in the shed and I spent a little time looking for the elusive top front engine bolt. Early ones are M8 x 135 compared with the later M10 x 135. I looked everywhere including some places it couldn't possibly be. It just wouldn't reveal itself.

Today was earmarked as the 'wheels day' but I found the coil brackets and got my freshly-painted coils in place just for a little assembly time, as I admired that lovely engine sitting in its chassis once again.

Out came the previously-polished hubs and brake plates from their hiding-place. I don't want these to be too shiny - I am just trying to get back to something like they would look like back in 1961.

In any case the rear hub still looked a little unloved so I gave it a quick turn on the polishing wheel. Trying to get a super finish on theses castings can be a little depressing as there are tiny pockets throughout the metal and you just expose more as you sand or polish out the surface ones.

I searched through all the spokes that had been re-plated but they didn't inspire me with confidence. Although I'd spent some time cleaning them up they just didn't look like they were going to look right or perform the task of keeping the rider safe.

After a considerable amount of indecision I came to the conclusion that I would have to get some new ones. Luckily, Central Wheel Components near Birmingham will manufacture spokes to a set of measurements. The decision is now between zinc and stainless steel. I don't really want something that looks too modern so I am going to opt for stainless-steel to the original measurements. Fronts will be double butted (bigger at teh ends than the middle) while rears will be single butted.

G