Topic: CB750 rotors(charging)

[Bill/BentON Racing]

Some rotor pics and weights. bill

in order

less weight

another

weights posted in order!
Weights
3.346 lbs no starter clutch
4.914 starter clutch missing 2 rollers,one spring and cap
5.792
6.004
5.834

[Greggo]

[MRieck]

The first one doesn't charge....the others do in poor order./

[Big Jay]

We used to cut those down. Especially the older ones with the big flange. Once we got them about as light as we could, they couldn't keep the battery charged. When they came out with the always on headlight deal, we quit doing it altohether.

[bwaller]

What is attached to that dog leg Bill? Man the poor cave is thinning down, you know you'll only have to clean up as space becomes available. Please don't sell the roadracer, slowly but surely TimV & I are racing our way towards you. You'll see the light again, promise! 

[scottly]

The rotor on the left of the attached pic is a stock K7 rotor. 2079 grams = 4.57 lbs. The one on the right is a cut down K1 rotor; that's as far as I could pare it down without affecting the charging.

[cbr954]

I have a lightened rotor from Cycle X, still seems to keep the battery charged.  I really like how it helped make the motor quicker revving.  It weighs about 4.75 lbs.

[754]

 Mine is like the lightest one, kept battery charged fine with a small battery, i run 72 and earlier headlight switch, you can turn light off, while starting warmup, etc.
 Scottly you can take more out that one. Drill the starter clutch holes to 5/8 or so, then 3 more in between..

[Bill/BentON Racing]

What is attached to that dog leg Bill? Man the poor cave is thinning down, you know you'll only have to clean up as space becomes available. Please don't sell the roadracer, slowly but surely TimV & I are racing our way towards you. You'll see the light again, promise! 

Roadracer going nowhere til I build it again......one day......tho I keep selling Greggo all my good 550 stuff!Bill

[Greggo]

Roadracer going nowhere til I build it again......one day......tho I keep selling Greggo all my good 550 stuff!Bill

Bill, you just need to buy one of my turbos

[Stev-o]

Roadracer going nowhere til I build it again......one day......tho I keep selling Greggo all my good 550 stuff!Bill

Ahhh.... now I know where Greggo's been getting all the cool hi po parts....

[scottly]

 Scottly you can take more out that one. Drill the starter clutch holes to 5/8 or so, then 3 more in between..

Those holes might remove 70-80 grams, but would reduce the charging, due to the loss of the area exposed to magnetic flux from the end of the field coil. I didn't remove any material on the ID at the open end of the rotor for the same reason.
The starter clutch, including the 3 mounting screws, weighs 1.23 lbs.

[MRieck]

I'm just waiting for a modern, 600cc unit with a permanent magnet to show up. Maybe 400 Watts all day....and half the weight. Who knows....it might happen.

[scottly]

CB 750 stator= 2.438 lbs
CB750 field= 2.706 lbs.

[scottly]

I'm just waiting for a modern, 600cc unit with a permanent magnet to show up. Maybe 400 Watts all day....and half the weight. Who knows....it might happen.

I would be happy with a unit that produces stock power, with half the weight.

[Retro Rocket]

I'm just waiting for a modern, 600cc unit with a permanent magnet to show up. Maybe 400 Watts all day....and half the weight. Who knows....it might happen.

VFR800.....

[754]

I got a 750 nighthawk unit rotor is under 3 lbs..iirc