Author Topic: 750K2 Custom Restro Project!  (Read 1966 times)

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Offline Panotaker

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750K2 Custom Restro Project!
« on: June 05, 2011, 06:04:16 PM »
Well this will be my second try at restoring this bike. I first bought this bike 10 years ago from one of my neighbors. He had it sitting in his garage for 17 years. I saw it sitting in the corner of the garage when I went by his house. I think I paid around $150 for it. I filled up the tires, took off the front break since it was frozen, and pushed the bike home. I took apart the carbs and had the bike running a couple of days later. I then took it by Texas Muscle Bikes in Austin and let the owner of the shop (Brent Adams), go nuts on the motor. He put in an 836 kit, Carillo rods, new valves and springs, had the head ported and polished, new undercut transmission, cam and all the usual go fast goodies. He had the motor for at least 3 or four years. I then drove it around for a couple of years. The only thing the bike lacked was a set of smoothbore carbs and new coils.

Then like a dummy, I let the bike sit outside for around five years. I started working on it last week. I took the carbs apart again, but they are pretty much shot. Looks like water damage to the inside of the carbs and a lot of the main jet towers have corrosion and the jets could barely screw on. Surprisingly it started right up, but it ran like crap. There was no blow by or smoke, so I'm pretty sure the bottom end is fine. I went to check the spark plugs and one of he sparkplug wires broke off because the wires where hard as a rock. Also, 3 of the sparkplugs would not come out. So it looks like I will have to take the head off and put some heli coils in the sparkplug holes.

Last week I bought a new Dina 2000 with coils, and new Keihin 29mm smoothbore carbs. I already had bought extra polished aluminum covers for the engine, so I am ready to take this puppy apart and start with the restoration. I used to have a brand new 75 CB750, so I am doing this one, like I would have done my original one back in the 70's if I would have had the money. I am probably going to send my head off to Mike and have him fix it for me. Then I will powder coat the frame, polish everything else and chrome the swing arm. I have a Kerker 4 into 1 on it right now, but I will probably go with the K0 stock single pipes. In the 70's, the first thing we did was take off the stock pipes and trash them, and put some 4 into 1 or 4 into 2 pipes on. Now it seems that everybody is going back with the stock pipes.

So on to the before pictures. Here is the bike as it stands right now. In the second picture you can see the new carbs and my polished covers. In the third picture you can see my new aluminum jack. I plan on painting the bike the original orange. So let the fun begin.
 

Offline Panotaker

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Re: 750K2 Custom Restro Project!
« Reply #1 on: June 06, 2011, 05:52:45 PM »
Well I got busy today and took most of the bike apart. I had a little trouble taking the front forks off since they where rusted to the triple tree. So I will have to replace the fork tubes and the chrome head light ears since they are also rusted. The rest of the disassembly went pretty smooth. Only thing I have left is remove the wiring harness and the engine. Luckily the wiring harness looks to be in pretty good shape, so I will probably reuse it. The plastic inner fender cracked the second I touched it, so I will have to hunt one of those down and replace it. I still have to find a local powder coater that I can take my frame to. So if any one knows of one near Austin Texas, let me know. Here is a picture after I took most of the parts off the bike.

Offline Panotaker

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Re: 750K2 Custom Restro Project!
« Reply #2 on: June 16, 2011, 05:14:51 AM »
I went ahead and took the engine out of the frame this week and it is ready to go to the powder coater. The frame had a home made frame kit to work on the top end on the bike. Only problem was, it was rusted on, and it took me all day to get it off and clean it up so it goes on and off now. The head is ready to come off too. It has two frozen sparkplugs on it that wont come off and will need to get heli coiled. I will probably get better valve springs with titanium retainers since the rest of the motor is highly modified. I have plenty of aluminum to polish up while I wait for the frame and the head to get done.

Offline Panotaker

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Re: 750K2 Custom Restro Project!
« Reply #3 on: June 21, 2011, 05:24:29 PM »
Well I got lucky with the frozen sparkplugs in the head. I have been spraying PB Blaster on the frozen sparkplugs for the last two or three weeks and they finally broke loose and I was able to take them out with no damage to the threads . So I wont have to have the head fixed after all. What a relief! The sparkplugs would only turn about 1/4 turn when they where stuck. So I would spray them everyday, and turn them back and forth once or twice a day until they finally came out today.

I have also been working on cleaning out my garage. I got a new workbench, a new Craftsman Professional air compressor, and a new fluorescent diamond plate shop light so I can see what I am doing now. I have also been working on polishing my aluminum parts.

pat english

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Re: 750K2 Custom Restro Project!
« Reply #4 on: June 21, 2011, 05:46:39 PM »
pretty cool story.and nice start.alot better then my "build"...

i got a set of aftermarket 4 into 2 pipes that would work for youre bike.but they have the mufflers cut off..easy fix if you can weld..

wana trade that 4 into 1 header for them?

i can send you some picks if youre interested..send me youre email..
                                                                                                          pat

Offline tango911

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Re: 750K2 Custom Restro Project!
« Reply #5 on: June 21, 2011, 06:31:51 PM »
great story.   I love these cb750s.  cant wait to get started on my next restore. ill be watching.

steve
CURRENT STABLE:
1969 Honda Dream 305 (black)
1974 Mach III kawi 500 smoker
K2 (project)
K2 Original fixer up
K0 original fixer up
2006 CRF250R