Topic: Running different HONDA Charging Rotors.

[754]

 I am looking at maybe running a 400 4 rotor.

 Anyone know if it is same as 350-4?

 i have the 400 rotor, but not the fied coil or stator.. I know I can get the 400 rotor on a 750 crank.
 Anyone know what output is for stock 400 system  VS 750 syatyem?

 The 400 rotor, untouched is 4 lbs lighter than a K2 rotor.. ., and I can get it lighter.

 Any thoughts or info, please post..

[camelman]

Same part.  They looked the same on my 350F and 400F, and the part numbers check out when I looked them up.

350F/400F charging output is the same, and is listed as 0.156kW at 5000 rpm.  I have no idea what the power curve looks like.

FYI: 500F is listed as 0.2kW at 5000 rpm, but the 550F is listed at a different rpm (2000) in my book, with an output of 0.11kW.  I'm sure the 550F put out more than 0.11kW at 5000 rpm.

Camelman

[lordmoonpie]

That's what I run - a cb350 K4 rotor and stator in my CR750. The ignition is a boyer micro digital with a power box to self generate. It's OK for a race bike, not sure it'd give enough juice to run lights on a road bike but I have an inkling that Boyer said it would. You could alwayc check on their website?

[Old Scrambler]

Just to be clear.............CB350 twin or I-4?  Cycle-X claims to have a CB350 conversion package for the CB750. It will run lights and uses a much lighter (smaller) battery. No electric start.  Apparently the easy housing conversion is to cut the stock CB750 housing to size and re-weld to get it lighter and about 2-inches shorter. Frank, I am considering that or a similar system for custom cafe build.

Regarding plastic and billet point covers ............the clear and colored vinyl units are all over ebay...........somebody in Ohio has billet covers with the HONDA Wing insignia.........I am sure more designs will come that are similar to the VOX unit (really cool).

[Jerry Rxman Griffin aka MuthaF'er]

What are the dimension issues with using the 350/400 rotors?

Narrower than 750 so it doesn't stick out as far thus not entering the stator coil/field coil enough and not creating the necessary current? Would the fix would be to cut down the cover and reweld it shorter? OR sticks out far enough but doesn't produce the necessary current?

It appears that the main difference between the 750 and the 750A charging system outputs of 210W vs 290W is the field coil windings. Could this be the same situation on the smaller bikes? If they fit then measuring the resistance/ohms might tell the story. Less ohms = less resistance = higher output. Just need to be sure the rectifier and other hardware can handle a higher output for any extended period.   

[754]

The 400 4 rotor fit the crank taper but sits out further, thus if you recut taper you can move it in approx 3/4 inch.

 The overall length is shorter, the middle section (that fits over taper& bolt pulls against) is smaller dia. The 750 field coil nearly fits but is long. I think a field coil is fairly easy to make.

 Using the stator off a 400, we should find a price. Since dia might? be smaller, and length is shorter, you can end up with a smaller dia custom cover that is tighter to motor..plus, (not sure) it may be able to run dry.

[kos]

Here is photo of RC Engineering rotor for CB750
OD is  113mm
Width is 46mm

KOS

[754]

Can you get a weight on it.. might be around 3.75 to 4 lbs.

 I can see 2 area to get a bit more off it..

[Ricky_Racer]

Anyone know what output is for stock 400 system  VS 750 syatyem?

Output of the CB750K is .21kw @ 5K rpm.  RR

[lordmoonpie]

Just to be clear.............CB350 twin or I-4?  Cycle-X claims to have a CB350 conversion package for the CB750. It will run lights and uses a much lighter (smaller) battery. No electric start.  Apparently the easy housing conversion is to cut the stock CB750 housing to size and re-weld to get it lighter and about 2-inches shorter. Frank, I am considering that or a similar system for custom cafe build.

Regarding plastic and billet point covers ............the clear and colored vinyl units are all over ebay...........somebody in Ohio has billet covers with the HONDA Wing insignia.........I am sure more designs will come that are similar to the VOX unit (really cool).

Dennis, I used a 350 K4 twin rotor and stator. The crank taper was machines right down and keyway matched to the 350 rotor so it sits very close to the crankcase. I then have an aftermarket cover which is modelled on the kit part and it slims the whole thing right up. I've been promising some pics for kos for a while now - I just need to get my a$$ in the garage and do them

[cavebear]

Frank,

   My 836cc race motor has the modified alternator installed by the previous owner. I don't know if it came from a CB360or a 350 four. I can tell you the new housing is 1 3/4 in. shorter than the stock housing and the diameter 1s 1/2 inch narrower. If you like I can take the housing off and have a look at the internals.

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[754]

 ah you dont have to open it up, I get the idea...but if you can see howmany/color wires come off it, that may tell the story!

 350/360 sounds attractive IF you can run batteryless..


 I am still toying with the idea of a belt drive mag on one side and  belt drive charging on the other, with an idler.. then you can slack adjuster, pull belt off.. for impromptu illegal drag racing (dont know anyone does that.. )...

[cavebear]

  I used Mr Peabodys" Wayback Machine and brought this back from 1975. It's a Sebring solid state battery eliminator forCB750s. Just a thought about using this in conjunction with the lightened alternator. Any body ever use one?






www.britishonly.com/pdf/sebring/sebringsolidstatepowerunit.pdf sebring electronics corp


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[MRieck]

Does it have vacuum tubes inside.

[bucky katt]

i have to wonder if the rotor from a 75 750f is any better than the one on my k6 motor.

[Jerry Rxman Griffin aka MuthaF'er]

Do they have different part numbers? I'd be surprised if they are different. I can weigh my 75 750F rotor in the next few weeks when I tear into it if you'd like.

[cavebear]

Three wires coming off the alternator, yellow, white and red.

[754]

Thanks for wire color info..
 Bucky, far as I know all 750 rotors were the same after 73.. except 750A, its like a 72 and down style..

[bucky katt]

Thanks for wire color info..
 Bucky, far as I know all 750 rotors were the same after 73.. except 750A, its like a 72 and down style..

thank you kind sir i think i'm going to get one of the rotors i have turned down to kick only and keep the other stock

[MJL]

Is this for a lighter rotor or power concerns? There si a fuel injection thread where a person fitted an alternator from a VFR Interceptor. It took some adapters but it fits under the stock cover.