Author Topic: cb750 chopper (Read 3133 times)

1stgenxxx · « **on:** August 16, 2015, 12:25:46 PM »

well....I bought this solid cb750 yesterday! I'm going to make a few changes (bars, rear fender, seat, forks) This thing rips!

Desert-SOHC · « **Reply #1 on:** August 16, 2015, 12:52:06 PM »

Nice find!

Stev-o · « **Reply #2 on:** August 16, 2015, 12:58:36 PM »

Groovy! Congrats...

SOHC Digger · « **Reply #3 on:** August 16, 2015, 03:28:04 PM »

Nice solid bike! A few finishing touches and it will be tight!

1stgenxxx · « **Reply #4 on:** August 16, 2015, 04:16:04 PM »

Quote from: SOHC Digger on August 16, 2015, 03:28:04 PM

Nice solid bike! A few finishing touches and it will be tight!

same thing I said when I saw it!

1stgenxxx · « **Reply #5 on:** August 25, 2015, 07:52:53 AM »

I got the bike home sunday night and got to ride it yesterday. The carbs will need a good cleaning.....It had short overflow tubes that were plugged. The bike flooded and I barely got it fire back up roll starting it down a steep hill.
The engine is a K0!
Seems to be a very early chop in an AAE frame....Hailcraft 15" rear wheel with a 750 front rotor/caliper on the rear.

754 · « **Reply #6 on:** August 25, 2015, 09:30:02 AM »

Nice I would. Turn the rear fender around, think it's backwards .
The front end might be KO,what is the engine Number?
I think that dragbars with built-in risers would look pretty good. I made a set by welding a flat plate to bottom of the bars. The plate was drilled to fit the stock tree. IIRC I had bent the ends over to hide the halfmoon cutout in the trees.

1stgenxxx · « **Reply #7 on:** August 25, 2015, 09:47:31 AM »

Quote from: 754 on August 25, 2015, 09:30:02 AM

Nice I would. Turn the rear fender around, think it's backwards .
The front end might be KO,what is the engine Number?
I think that dragbars with built-in risers would look pretty good. I made a set by welding a flat plate to bottom of the bars. The plate was drilled to fit the stock tree. IIRC I had bent the ends over to hide the halfmoon cutout in the trees.

After looking a little more....I think the engine might be sandcast. 1004xxx I think. that would be a pretty solid buy for 1400$

754 · « **Reply #8 on:** August 25, 2015, 11:11:54 AM »

Okay look at the number pad on engine, it should not have a raised frame around it
The lower legs look KO from what I see.. But they probably. Are worn if it has many miles.
With the right pipes, you can lower the front a lot..
On the discs, the aluminum center part, is the edge square or tapered down to almost point?

scottly · « **Reply #9 on:** August 25, 2015, 11:52:42 AM »

This is what Frank means about the rotor hub:

1stgenxxx · « **Reply #10 on:** August 25, 2015, 12:17:51 PM »

Quote from: 754 on August 25, 2015, 11:11:54 AM

Okay look at the number pad on engine, it should not have a raised frame around it
The lower legs look KO from what I see.. But they probably. Are worn if it has many miles.
With the right pipes, you can lower the front a lot..
On the discs, the aluminum center part, is the edge square or tapered down to almost point?

The tubes are extended and right side is a little rust under the dust boot.
I will take a look at the rotors tonight

1stgenxxx · « **Reply #11 on:** August 25, 2015, 02:05:06 PM »

I was wrong

it's a K-0. Last digits of vin are 37xxx.
Still glad to have an early motor

754 · « **Reply #12 on:** August 25, 2015, 02:26:44 PM »

Well, how did you come up with the 4xxx number? Your forks look like KO. It's the radius below the wider seal area that is different.
So check the rotors.
Looking at the head is there a bolthead in the middle between #2 and#3 plugs.
Carbsare are not KO

1stgenxxx · « **Reply #13 on:** August 25, 2015, 06:10:20 PM »

Quote from: 754 on August 25, 2015, 02:26:44 PM

Well, how did you come up with the 4xxx number? Your forks look like KO. It's the radius below the wider seal area that is different.
So check the rotors.
Looking at the head is there a bolthead in the middle between #2 and#3 plugs.
Carbsare are not KO

I had just glanced at the vin....and thought it was in the 4000s
engine number is 1037366 so that should make it a k-0
The front rotor is the tapered one and rear has the raised edge.

1stgenxxx · « **Reply #14 on:** August 27, 2015, 06:20:45 AM »

I took the bike for a ride on Monday and it almost left me stranded. The po had plugged the overflows so I made it about a mile from the house and gas started pouring out of my pods. The bike flooded so i cut the gas off and was able to get roll started and made it back to the house.
Pulled the carbs and they were super clean but aparently need new needle/seats.
I also took the hacked up front fender off and started brainstorming on a new seat/fender
I will be relacing the rear hub to a highshouldered AL 19" rim.
The front will also be highshouldered on either a stock hub or spool.

1stgenxxx · « **Reply #15 on:** August 27, 2015, 06:48:34 AM »

I'm going to unbolt the fender and rotate it forward to get me by for a month or so

The fork brackes are coming off when I get it to the shop

Stev-o · « **Reply #16 on:** August 27, 2015, 08:03:05 PM »

19" rear rim?

SOHC4 Cafe Racer Fan · « **Reply #17 on:** August 27, 2015, 10:54:09 PM »

That's a new one on me, too.

1stgenxxx · « **Reply #18 on:** August 28, 2015, 06:20:41 AM »

Quote from: Stev-o on August 27, 2015, 08:03:05 PM

19" rear rim?

I'm considering it....
Ive already got a 19" hoop. I'm going with a 21 on the front.

Stev-o · « **Reply #19 on:** August 28, 2015, 06:24:37 AM »

Most guys usually dropped the rear of their Choppa....

1stgenxxx · « **Reply #20 on:** August 28, 2015, 07:28:15 AM »

Quote from: Stev-o on August 28, 2015, 06:24:37 AM

Most guys usually dropped the rear of their Choppa....

Yea most of them do.....but I'm a fan of a bigger rear wheel. Drawing inspiration from a lot of shovels that Ive seen with 18" rear wheels. I may end up buying an 18" hoop if I can find one at a decent price

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Author Topic: cb750 chopper (Read 3133 times)