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Author Topic: Nixon, 1972 Honda CL450 Scrambler Refurb  (Read 7558 times)

Online Flugtechnik

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    • Nixon and Me
Nixon, 1972 Honda CL450 Scrambler Refurb
« on: Jul 28, 2016, 03:44:49 »
Most of you who have been on here awhile have seen this before.  She's been around the block. It's time for another rebuild, the final rebuild. 

When I bought her, she looked like this.



Then I did the cafe thing.  Custom aluminum tank and seat.  She looked like this until I rode her off the side of a mountain.
http://www.dotheton.com/forum/index.php?topic=9560.0




Ooooops.
http://www.dotheton.com/forum/index.php?topic=36724.0




Then we (with the collective help of DTT at the Barber Vintage Fest) rebuilt her into the scrambler she was meant to be.
http://www.dotheton.com/forum/index.php?topic=36857.0



Ended up pretty damn close to my design sketch.




Now, she is burning oil and popping out of 2nd gear.  It is time for a final rebuild.

My progress will be documented below.

I don't plan on any major design changes. I'm just going to make everything right and "final".

Let's do it right this time around.
« Last Edit: Aug 12, 2016, 13:27:34 by Flugtechnik »

Offline NoRiders

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #1 on: Jul 28, 2016, 04:29:55 »
The life and times of a CL.... ;D to be con't......love it.


PS Wipe out looked pretty serious man....how were you rebuilt?

Offline JustinLonghorn

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #2 on: Jul 28, 2016, 07:44:19 »
Yep
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline trek97

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #3 on: Jul 28, 2016, 09:52:33 »
On board.

Online Flugtechnik

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    • Nixon and Me
Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #4 on: Jul 28, 2016, 16:46:26 »
The first step in the rebuild will be to get the engine mechanically sound again.  It is burning oil and I suspect the valve guides/seals are failing.  I rebuilt the top end about 5 years ago, but it was my first time messing around in an engine so who knows what I did.  It has also been popping out of 2nd gear, so I will be rebuilding the bottom end this time too.  The last time I rode it, oil was gushing out of it when I got home.  Let's see what the problem is.

First take off the pretty stuff.






Then pop the engine out with a rubber mallet.




Let's get to work....




Found the problem.  The clutch pushrod oil seal popped out.  The new one will get installed with some loctite.


Offline Green199

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #5 on: Jul 28, 2016, 17:38:13 »
Will Loctite be sufficient to secure the new seal from any increase in crankcase pressure?

I've seen some quite simple oil seal 'retainer' designs which are effective and secure using the fastener which holds down the stator wires.
1973 CB250 'Doing it right this time round' - http://www.dotheton.com/forum/index.php?topic=36795.0

Online Flugtechnik

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    • Nixon and Me
Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #6 on: Jul 28, 2016, 18:18:00 »
PS Wipe out looked pretty serious man....how were you rebuilt?

Luckily bones heal all by themselves!


Will Loctite be sufficient to secure the new seal from any increase in crankcase pressure?
I've seen some quite simple oil seal 'retainer' designs which are effective and secure using the fastener which holds down the stator wires.

I think it will be enough.  The seal doesn't fit very tightly.  The friction of the rod might have actually pulled it out. The crankcase is vented with a sizable tube so pressure buildup should be minimal.  If it happens again I will add a retainer as you suggested.

Offline NoRiders

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #7 on: Jul 29, 2016, 05:03:23 »
A twisted wheel spoke (or wire coat hanger) could work as a seal retainer, maybe a ? shape?

Online Flugtechnik

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    • Nixon and Me
Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #8 on: Jul 29, 2016, 13:35:08 »
I spent last night taking the top end apart.  First I had to remove the ignition.  This turned out to be much harder than planned.  I have one of PAMCO's original electronic ignitions installed, the one without the electronic advance. 




It turns out that all of the movement of the advance mechanism caused the little nubs of the advance weights to deform the aluminum of the timing rotor.  It was originally just a straight slot.  I have only put MAYBE 2000 miles on this ignition.  Looks like you should have used a harder material Pete!  Because there is a small lip on the shaft of the advancer, the deformed rotor would not come off.  I had to pry it off.  You can kind of see where the aluminum scraped on the shaft.  I was planning to get a new ignition for it anyway.  I don't like all of the exposed electronics of the PAMCO and on this particular model, you can't adjust the two pickups separately. 




Once I got that off, I could disassemble the rest.




Bag and tag...... Bag and tag......




Offline VonYinzer

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #9 on: Jul 29, 2016, 13:42:10 »
Very cool Mike. Signed up.
The faces of the damned
And all the butchered lambs
If I had to do it over
I just would've done it slower


Offline xulf13

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #11 on: Jul 29, 2016, 16:11:26 »
Well Mike, you know I'm in. Holler if you need any help or moral support


Sent from my iPhone using Tapatalk

Offline Maritime

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #12 on: Jul 29, 2016, 16:25:00 »
I'll watch too, good luck, you'll make her right.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Mr.E

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Re: Nixon, A 1972 Honda CL450 Scrambler
« Reply #13 on: Jul 30, 2016, 19:18:14 »
Uh Oh.  see you are WAY more organized than I am.  Lemme know if you need any help man, I'm not too far away and hopefully have less on the table in a couple weeks