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Author Topic: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!  (Read 12918 times)

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Offline MCRider

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Re: 1974 Honda 750 froze solid in 4 months of sitting.
« Reply #50 on: October 31, 2013, 08:33:05 AM »
Quote from: taggat on October 31, 2013, 08:19:48 AM
Quote from: MCRider on October 29, 2013, 07:30:00 AM
ITs been a while since we've discussed this. There was an engineering report here on solvents. IT showed a 50/50 mix of acetone and ATF is about 2-4 times more effective than Blaster and other commercially available stuff.

whats the purpose of this mixture for?

I use a 20/80 mix of acetone and the cheap super clean degreaser for carbs but...
your reference to PB makes me think rings? or frozen bolts and nuts?



I tried the harbour freight impact driver twice now, the bits are junk.
Penetration of stuck parts.
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Offline DanJ

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #51 on: October 31, 2013, 08:42:54 AM »
Quote from: iron_worker on October 31, 2013, 08:00:15 AM
You probably should have waited until you got the bearing support (with the 3 phillips head machine screws) out before you split the cases. You're going to need the motor to be as solid as possible in order for the impact driver to be effective. Those screws are in there really good. I think Honda must have used some sort of thread locker from the factory.

IW
I couldn't get 2 out even using a impact driver. I had to drill them and use an easy out.
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #52 on: October 31, 2013, 10:23:45 AM »
Quote from: iron_worker on October 31, 2013, 08:00:15 AM
You probably should have waited until you got the bearing support (with the 3 phillips head machine screws) out before you split the cases. You're going to need the motor to be as solid as possible in order for the impact driver to be effective. Those screws are in there really good. I think Honda must have used some sort of thread locker from the factory.

IW

May have to put a few bolts back in it.  Thanks



IW
[/quote]I couldn't get 2 out even using a impact driver. I had to drill them and use an easy out.
[/quote]

Dang.... not good news.
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Offline MCRider

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #53 on: October 31, 2013, 10:55:29 AM »
On some models, I think they are staked and you have to overcome the staking to get them to turn.
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #54 on: October 31, 2013, 12:23:21 PM »
Quote from: MCRider on October 31, 2013, 10:55:29 AM
On some models, I think they are staked and you have to overcome the staking to get them to turn.

Ok, i assume I should put some blue locktite on the them when I go back with them then. Will post some pics later of my progress.
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Offline DustyRags

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #55 on: October 31, 2013, 01:44:24 PM »
Check those screws- if they're (like) phillips but have a small dot or X next to the screwdriver slot, they're JIS (Japanese Industrial Standard). Get the proper drivers and bits, they make a world of difference. Very similar to phillips, but not quite the same. Phillips tend to pop out of those.
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #56 on: October 31, 2013, 06:44:52 PM »
Got the 4 screws out and seperated the two cases without a hitch. Took rod caps off and removed crank, no problem.

Holy crap!! This thing is going to fight me the entire way.  I still cant get the stickin jug off. One of the pistons broke loose and will move freely which is nice but come on. 

Is it just the gasket holding it? Or do the skirts for the pistons that are built into the head where its stuck? 

Its soaking in trans and acetone right now.  Will upload pics asap.  Thanks.
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #57 on: October 31, 2013, 06:51:52 PM »
pics
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Offline MCRider

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #58 on: October 31, 2013, 07:53:50 PM »
Quote from: Kris on October 31, 2013, 06:44:52 PM
Got the 4 screws out and seperated the two cases without a hitch. Took rod caps off and removed crank, no problem.

Holy crap!! This thing is going to fight me the entire way.  I still cant get the stickin jug off. One of the pistons broke loose and will move freely which is nice but come on. 

Is it just the gasket holding it? Or do the skirts for the pistons that are built into the head where its stuck? 

Its soaking in trans and acetone right now.  Will upload pics asap.  Thanks.
Just the gasket is holding it. Paint some 50/50 on it and let it soak.
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #59 on: October 31, 2013, 08:12:54 PM »
okie dokie will do! Thx man.
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Offline PeWe

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #60 on: November 01, 2013, 04:03:24 AM »
Tried with hot airgun? Heating the cylinders..... and pistons if they need extra to fight the rust
Some stuff cannot be removed without hot airgun. Brake caliper nipple, fork seals etc, etc...
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #61 on: November 01, 2013, 06:17:47 AM »
Have not, although I see this weekend me gettin creative if it dont break loose tonight.  8)    Fire!
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Offline Airbusboy

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #62 on: November 01, 2013, 07:43:01 AM »
My 'hangar find' was a '74 CB550 that had sat for 38 years with only 4500 miles on the clock. I pulled the plugs and mixed a cocktail of PB Blaster and Marvel Mystery Oil. I put a healthy dose into each cylinder and let it sit a week. She turned over pretty as you please with the kick starter, then by the electric starter.  Now she purrs like a kitten. Hang in there, it CAN be done!
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #63 on: November 02, 2013, 08:00:46 PM »
A little update for today. Well the fire in the hole trick worked.  Let the fires burn for about 20 min. Even 30 plus years of stuck couldnt take it.  Was able to remove the cylinder bores and drive out the pistons.  Still took some effort though.  Split the cases, removed all parts, degreased, steam cleaned all parts, cleaned up all gasket surface, removed old piston rings, and more today.  Had a good time doing it too.  Now to order parts!  Here are some pics and a video if it will work....
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #64 on: November 02, 2013, 08:02:58 PM »
video
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #65 on: November 02, 2013, 08:04:12 PM »
video of the engine turning for the first time since the 70's!
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Offline 70CB750

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #66 on: November 03, 2013, 12:21:49 PM »
Nice!

After the wash, coat all steel surfaces with oil, they will rust in hours otherwise.
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Offline 754

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #67 on: November 03, 2013, 01:50:57 PM »
Not a 74, looks like a very early 73 or older.
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Offline hondabbqman

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #68 on: November 03, 2013, 02:19:38 PM »
Subscribing to this thread - very interesting!
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Offline fmctm1sw

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #69 on: November 03, 2013, 03:21:23 PM »
I've never seen the "fire method."  It burned 20 minutes?  What did you put in it to burn?
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Offline ekpent

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #70 on: November 03, 2013, 04:06:25 PM »
Hopefully you had a couple of hot dogs and some marshmallows for the kids   :D
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #71 on: November 03, 2013, 06:34:12 PM »
Quote from: fmctm1sw on November 03, 2013, 03:21:23 PM
I've never seen the "fire method."  It burned 20 minutes?  What did you put in it to burn?

I pooled carb cleaner in the cylinder bores and lit it and walked away. Each pool would last about 5 mins.  Just kept filling and lighting it.

Ordering parts for a 73.
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Offline PeWe

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #72 on: November 04, 2013, 02:51:50 AM »
For guys without electrical outlet for a hot airgun
http://www.instructables.com/id/Easy-to-make-and-safer-to-breathe-Napalm/
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline JayDanielz

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #73 on: November 04, 2013, 03:35:41 AM »
Awesome! You can officially say your one of the few people in the world who has seen the intestines of these great motors...at our shop, we LOVE getting in junk motors, just so we can rip into 'em and see what's inside...
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Offline Kris

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Re: 1974 Honda 750 froze solid in 4 months of sitting/ Now 35 years later!
« Reply #74 on: November 05, 2013, 07:00:44 PM »
Ok, well lil update.  Went to father in laws to steal the bike back and got cought. LOL. So anyway he knows now whats going and was pretty pumped.  No pressure now I have to get it running.  Loaded the bike up and brought it home.  Here are some pics...

All gaskets and piston rings should be here thursday.  Got the head honed today as well so I go that out of the way.  Notice the license plate, the year it was last registered.  WOW!

« Last Edit: November 06, 2013, 07:09:44 AM by Kris »
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