The Norda

[Ratranger]

So I mentioned this idea in a different thread, but I found a key component today. This will be a slow build, some parts are spendy. The plan is to stick a CB750 SOHC in a slimline featherbed frame. I've had the frame for years, and today I found a CB750 basket case for $200.

I gotta say honda made sure the motor was all there, it makes the XS motor seem light.

So plans are 1. Strip the motor, then clean/vapor blast. 2. Use the bare cases to figure out the motor plates. 3. Fit the cbr600f4i forks to the frame. And finally 4. Save money for all the rest.

 

[Jan_P]

Saving money on a CB 750 $ 200 motor
That can be difficult --
Rumor is that parts are Expensive
Will be interesting

 

[Mailman]

Looks like an interesting project, watching!

 

[Ratranger]

Saving money on a CB 750 $ 200 motor
That can be difficult --
Rumor is that parts are Expensive
Will be interesting

According to the seller it was running before they took it apart. It spins over, wasn't left outside to rust. Cylinders show a little wear on borescope, but nothing terrible. I'm hoping I'll get away with 1st or second over pistons and a gasket kit. I have a vapor blast cabinet and parts washer so clean up is no big deal.

 

[willis]

Subscribed!!!!

 

[Jim]

I'll follow.

 

[Grimly]

The plan is to stick a CB750 SOHC in a slimline featherbed frame. I've had the frame for years, and today I found a CB750 basket case for $200.

Sounds good.
I look forward to the reactions of the rivet-counters.

 

[halfmile]

Cycle X has killer Honda 750 stuff. Check m out.

 

[atom4488]

I'll follow.

Me too... love a good bitsa build!

 

[Ratranger]

Cycle X has killer Honda 750 stuff. Check m out.

They have some real nice stuff and prices look more than fair, but man that is a quick way to spend a lot of money. My plan is to stay mostly stock on the motor. But the upgraded tensioners are probably a good idea.

 

[RC4MAN]

Are you sure it's not a Honton

 

[Jan_P]

According to the seller it was running before they took it apart. It spins over, wasn't left outside to rust. Cylinders show a little wear on borescope, but nothing terrible. I'm hoping I'll get away with 1st or second over pistons and a gasket kit. I have a vapor blast cabinet and parts washer so clean up is no big deal.

I did take a quick look at e-bay for crank shaft and was surprised that they are not extremely expensive Against what I have heard
Surprising

 

[Ratranger]

I did take a quick look at e-bay for crank shaft and was surprised that they are not extremely expensive Against what I have heard
Surprising

It can get spendy. If you go for all the upgrades it can easily hit $4-5k just for the bottom end.

 

[RC4MAN]

Those old SOHC lumps were about as reliable as rocks which is why they built them for so long. A cam, pipes and carb tuning is about all I would do to improve it, if anything. Be interesting to see it finished.

 

[Ratranger]

Someone has definitely been into the motor atleast part way, lots of stripped screws and uneven torque on the top end.
But a manual impact got all the screws out, and so far it's looking decent. Cam journals are clean and cam looks good. Rocker shafts show wear marks, but nothing that can be felt/measured.

Engine turns over nice and smooth, it's also extremely clean atthe stator and shift mechanism. No signs of lack of maintenance.

 

[Adamc]

So I mentioned this idea in a different thread, but I found a key component today. This will be a slow build, some parts are spendy. The plan is to stick a CB750 SOHC in a slimline featherbed frame. I've had the frame for years, and today I found a CB750 basket case for $200.

I gotta say honda made sure the motor was all there, it makes the XS motor seem light.

So plans are 1. Strip the motor, then clean/vapor blast. 2. Use the bare cases to figure out the motor plates. 3. Fit the cbr600f4i forks to the frame. And finally 4. Save money for all the rest.View attachment 333459View attachment 333460View attachment 333461

Oh yes I’m up for this one!

 

[JesseeS]

Looking forward to this

 

[Ratranger]

Cylinders aren't terrible. Measure at 2.403" which is in spec, but it'll probably need to go 1st over to clean up everything. Wear isn't bad, nothing that will catch a nail, mostly staining from sitting most likely.

Upper chain roller shows some wear, lower looks fine and front guide looks fine.

 

[Ratranger]

Here's your reason to spend $10-30 on an impact driver. Every screw on this motor was partially or fully stripped, the impact driver got every single one out. Here's a picture of the "better" screws. Harbor freight, amazon, autozone etc. sells these, buy a 10 pack of extra cross point bits on amazon and be amazed at how well it works 90% of the time(some fasteners are just too corroded in for anything to work).

 

[Jan_P]

Please tell how you use it I have not had great success over the years
Possibly via using the wrong method
Better when I apply torque counter clockwise on the wrench before hitting
The latest I have was higher priced and can be better
Are you tapping it or smashing with force ? Large or small hammer ?

Should be outlawed those screw heads