1961 CB72 Project

Steverino · Post by **Steverino** » Fri Mar 20, 2015 6:24 pm

That crank is beautiful.

G-Man · Post by **G-Man** » Sat Mar 21, 2015 1:34 am

Steve

Thanks! I have learned a lot from doing this one and will make some improvements with the next one. There are several engines I want to restore so it was worth getting the tools together. Essentially it is important to buy the biggest press you can afford / accommodate and get together tools that can preserve the angular positions of the crank pins and timing sprocket.

The bigger press is stiffer so less energy is used up in stretching the press frame. The 'spring' in smaller presses makes controlling the process rather harder.

This is what I found in my CB77 when I stripped it.....

Did you get your stand pivots repaired?

G

sixtiescycle · Post by **sixtiescycle** » Sat Mar 21, 2015 10:07 am

You are inspiring me to try this! I have a set of new rods acquired several years ago, several cranks laying around and just for fun I'd like to phase one at 270 degrees like has been done to the XS650's.

G-Man · Post by **G-Man** » Sat Mar 21, 2015 1:41 pm

Jensen

Somehow I missed this post. I love the look of those drum-braked CB450s. Thanks for sharing those.

I know where there is a NOS C71 cylinder head......

G

jensey wrote:
Great to have to back here on the forum.
Never bin away really, but not very much to tell, so big pauses between responses.
As can be seen on the Hondatwins forum, I had my hands full with the 450's, one K0 for testing the 10W60, one red CB450 K2 (next year rider) complete engine rebuild including Cappelinni oil pump and filter set-up, and one blue K1, restoring to stock (no modifications here).

I also building a CB500T engine with oversized pistons, Cappelinni oil pump / filter, needle bearings on cams, electronic ignition etc.

After the 450's it's a 1964 dream on the stand for a complete restoration (was my daily driver years ago).

In the mean time I'm making room, just by dissembling 6 early dream engine's (C71/C76) which are lying on the floor, on the hunt for 2 good cranks.

Here some pictures of the 450's :

G-Man · Post by **G-Man** » Sat Mar 21, 2015 1:46 pm

Dick

You have nothing to lose. For the "270" you may have to look at what spacing you can get from the cam splines then set the crank phase based on that. Also the crank centre has 74 'pseudo' splines so getting it to work nicely at odd angles may need some good tooling.

Feel free to ask questions. I am not the expert but I have learned some of the issues from folks with more experience than me.....

G

sixtiescycle wrote:You are inspiring me to try this! I have a set of new rods acquired several years ago, several cranks laying around and just for fun I'd like to phase one at 270 degrees like has been done to the XS650's.

Steverino · Post by **Steverino** » Sat Mar 21, 2015 2:00 pm

Hi G Man
I am following this thread with keen interest. Like sixties cycle I've got a few pressed cranks that I would like to work on. A couple years ago I had a CA95 that had loud rod bearings. I had to resort to buying a CB92 crankshaft and having it shipped from the UK, which was CB92 expensive.
I haven't repaired my center stand mounting holes yet. I am just a little queasy about putting that much heat to my new powder coat. I am trying to decide between bombarding the area with cold air or applying some sort of heat sink.
Any Ideas?
Steve

G-Man · Post by **G-Man** » Sat Mar 21, 2015 2:44 pm

Steve

My postings on the crank were an attempt to de-mystify things a little. I have quite a few cranks to do so it is all good education and worth investing the time. It also allows you to make your own decisions on what will "do" and what won't. It's very easy to throw serviceable parts away in the pursuit of perfection.

I have thought about the stand. Depending on how bad they are, it might be possible to get some "top hat" bushes made and open the holes up to suit. You would have to have plenty of meat around the holes to do that.

If you are going to heat the area you could get some heat resistant blanket to keep the heat out and cool the area regularly with some damp material that might save the paint. It's in a pretty 'invisible' location anyway so a bit of spray black should help sort it out.....

http://www.cupalloys.co.uk/brazing-anci ... /index.asp

Take care

G