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Author Topic: 1972 Honda CB450 Cafe/Brat inspired build  (Read 23101 times)

Offline reesea17

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1972 Honda CB450 Cafe/Brat inspired build
« on: Nov 27, 2012, 23:22:58 »
Brand new to the boards and looking to start a build thread on a bike I just bought around a week ago.  I picked up a 1972 Honda CB450 from a guy who said that the bike has a hole in the left piston head and had been recently taken apart and loosely put back together.  I am currently working to tear down the bike and get to the engine at least in order to see what size replacement head I will be needing along with other parts before I take a little trip to Japan for vacation. 

Don't have a whole lot of stuff to show off for now but will be updating as I go.  Here is a photo of the bike as I received it.



Thanks for stopping by for now.
« Last Edit: Feb 10, 2013, 01:09:58 by reesea17 »

Offline ALBATROSS

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #1 on: Nov 29, 2012, 14:10:17 »
hey,

I also just recently bought a 72 cb450, and even with the destroyed seat yours is still cleaner looking than mine.  I'll be watching this thread

Offline reesea17

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Update
« Reply #2 on: Dec 03, 2012, 16:26:50 »
Not a whole lot of progress but I got a few things done and have a question for the all knowing.

Finally got the bike out of my dining room and into my "shop".  As an apartment renting college student I lack the utility of a garage and had to improvise.  I submit my spare bedroom workshop.



Got a lot more of the bike torn down and found this nice little bolt



Here is the bike as it sits waiting for me to pull the motor.  Eventually I will be able to get in there and see what kind of damage was done to the left piston head that the seller was telling me about.



And now for my question or more so concern.  In prepping to take the motor out of the frame I drained the oil, and in doing so I found a bit of creamy white gunk came out with the oil and there was what seems to be a plastic circle in the cap.  I don't think that it belonged there and that it probably came off of something.  Question here, since I am 100% new to this and these motors, is is this a huge deal to be concerned about at this point and do you know what it is?

The gunk



the plastic piece



Thanks.

Offline cqyqte

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #3 on: Dec 03, 2012, 17:01:14 »
Yuk I remember the finds when I tore my '71 down to bits and pieces.  I am sure the whole history will be revealed to you before you are completed.  ;)
'71 CB450K4 (BlackJack) Sold
'83 GS450GA (Automatic) Sold
'75 CB750F Hardtail (Deviant, 2010 Class Winner)
'02 XV1600 Roadie (the Stooge) Sold
'01 XV1600 RoadStar Custom Bagger
'01 VT750DC Sold

Offline Nebr_Rex

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #4 on: Dec 04, 2012, 00:01:09 »
Unfortunately the tear down has hit a snag as pretty well all the motor screws/bolts and certain screws in other places are essentially locked up tight.  This build will be slow for a little while I just wanted to get it started up.  I will be out of country for about a month.

You need an impact driver for the tight screws and bolts.
White gunk could be condensation from hole in piston.
Round thing,no idea.

Offline Shred_McGnar

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #5 on: Dec 04, 2012, 01:28:35 »
I think someone creampied your motor.. >:D

Offline reesea17

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #6 on: Dec 04, 2012, 02:03:24 »
You need an impact driver for the tight screws and bolts.
White gunk could be condensation from hole in piston.
Round thing,no idea.

Thanks for the input, especially on the gunk.

Unfortunately I believe I may not have been clear, it's not that they are simply tight.  But that they are 40 years old and when you put even a perfect sized bit into the head of the screw it still just strips to a little cone indent.  And this is what most of the screws look like now on the motor as the person the previous owner took it to didn't seem to have to much concern for tearing into the fasteners.  The main problems I was having was getting the handlebar controls off. However using a dremel I was able to turn the screws into flat heads and got them out in that fashion. 

Luckily I found a link to a site in someone elses post that has pretty cheap full motor fastener sets in stainless steel so I'll be purchasing that soon.  All sets come individually bagged and labelled. Link below incase anyone else is interested, they have sets for pretty much any bike:

www.stainlesscycle.com

Also, I am looking into getting an angle grinder in order to cut off some of the tabs on the back of the bike and in order to cut of the seat and prep it for a brat style rounded bar. Any advice on the types of cutting, polishing, sanding heads I should get along with it?

Offline Flugtechnik

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #7 on: Dec 04, 2012, 09:42:31 »
I approve of stainlesscycle.com.  Takes awhile to ship but good product.

I am not aware of any plactic bits in the engine.  Maybe something in the bottom end, I never dug into mine.

I have seen some aftermarket pistons have little plastic caps instead of piston pin retaining rings.

Looks like you have a fun adventure ahead.

Offline reesea17

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #8 on: Dec 04, 2012, 16:39:00 »
Well I had about 30 spare minutes today between class and work so I decided to get the motor out of the frame.





Was able to look in through the spark plug hole and sure enough there seems to be a small hole in the piston head.  Will start the tear down of the motor whenever I am granted some free time again.

Anyone have any advice on a motor mount?  Should I try to just make one out of wood or are there any reasonably priced ones out there. I don't have time to look right now.

Offline johnd900

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Re: 1972 Honda CB450 Cafe/Brat inspired build
« Reply #9 on: Dec 05, 2012, 03:44:54 »
Good thread so far, keep it up I'll be following along.  I'm just starting my '73 CB450 annd I'm starting my build thread as well.