Topic: Dorothy III - CB750

[SOHC4 Cafe Racer Fan]

Prokop,
I think the 1st generation 86-87' VFR750/700F Interceptor rear swing-arm would work well on your CB750 modification;that one is not 'cast' aluminum.

That is good to know, thank you.  Looks like they are dirt cheap on eebay too.

Check the length, thats the biggest issue...

No kidding.  Shortening it while retaining structural integrity will require some thought and skill with a tig.

[70CB750]

Thank you.  I use hydraulics to get the bigger logs up.  The original Logosol uses steps where you 'walk' the log up one side at a time.



If by tracking you mean moving the log for the next cut, that's 1" ACME on each end with welded on ring handle.  The saw head I originally pushed myself into the cut, before I tried an old boat winch.  Now it is easy, just slow winching.

No kiln yet, not sure if I will ever build one, but guy I know stored his wood in the attic.  While it was pain to get up there, it dried fast and free just from sun heating the attic up.

Cool sawmill. I can't figure out your mechanism for the tracking end to end.  Glad you got it working. What method are you using to get the log on the machine? Have you built a solar drying kiln shed?
Saw one years ago and it was able to dry the cut materials much dryer than typical air dried methods and it was an easy construction method with the angled face in the common arc of the sun to take advantage of the peak sun hours.

[70CB750]

I hear you, thanks   

I want to use original 18" wheel too, but all of this is just planning, I just dont have time to work on it now.

Prokop,
I think the 1st generation 86-87' VFR750/700F Interceptor rear swing-arm would work well on your CB750 modification;that one is not 'cast' aluminum.

That is good to know, thank you.  Looks like they are dirt cheap on eebay too.

Check the length, thats the biggest issue...

[70CB750]

Prokop,
I think the 1st generation 86-87' VFR750/700F Interceptor rear swing-arm would work well on your CB750 modification;that one is not 'cast' aluminum.

That is good to know, thank you.  Looks like they are dirt cheap on eebay too.

Check the length, thats the biggest issue...

No kidding.  Shortening it while retaining structural integrity will require some thought and skill with a tig.

I talked to Cal already 

[RAFster122s]

Red Cedar makes some nice outdoor furniture when dried and then sealed once you make the item. Even can make nice looking furniture...just a little soft as it will dent easily.  I couldn't figure out how your cutter was going end to end... I saw the Acme Jack screws.
Nice looking setup and I imagine it will pay for itself quickly. Those are some nice looking logs.

[70CB750]

I bought a swingarm, now what? 

[Stev-o]

Prep and paint?

[70CB750]

It is aluminum from 1980 Suzuki - needs some serious fitting

[Retro Rocket]

It is aluminum from 1980 Suzuki - needs some serious fitting

When measuring at the pivot end to shorten, as it looks like you have roughly marked, don't worry if you go a little over stock length, an inch over at the rear won't make a great deal of difference, the rear is a little more acceptable to change, and has a lesser effect than playing with the triple clamp offset at the front, which has to be a more thought out process,  the biggest thing to "fix" with that arm, apart from length {if thats an issue for you}, is either to make up a sleeve for the Honda pivot bolt so it fits the GS arm  or, bore out the pivot holes in the frame to match the GS arm using the Suzuki pivot bolt. Neither fixes are too hard, they just need to be done accurately.  They are a well built arm and are a very common addition to the old 900/1000 kawasaki's....

[grcamna2]

That swingarm looks like the same one from my 1982' Suzuki GS1100E,I have a full set NOS 'in pckge.' oem swingarm bearings,sleeves and seals for that.

[Retro Rocket]

Are you planning to shorten at the throat or along the legs?

Best done at the pivot end Cal, it won't restrict the wheel diameter  you use then... I had a GSXR1100 arm shortened, I couldn't get it to the required length at the axle end, run out of room, I should have had it shortened at the pivot end for the same reason...

[Retro Rocket]

Dunno. I'd look at shortening the leg after the bracing and before the bend to the axle. That way the leg angle remains consistent. Cutting at the pivot requires a lot more cutting, fitting and welding to my eye.

Possibly, but the arm isn't the same height front to back, it gets higher all the way from the pivot to the chain adjusters, so there would be a step where its welded,  also, the pivot tube is square or flat at the back where its welded to the arm, which makes it relatively easy to reweld if the cuts are nice and square...

[70CB750]

I want to make new pivot tube - fitted with bronze bushings - and weld it to the arm; shortening at the throat for sure. 

Along the legs would be easier for jigs and alignment, but as RR says, the profile is not constant.

If I oversize the pivot to say 2", I may not need to fish mouth those arms, just two positioning slots on the pivot will be enough.

[70CB750]

You got a point 

If I take it all apart, I could position legs closer together to make it fit CB750 drum wheel.  Decisions, decisions.

[Retro Rocket]

You got a point 

If I take it all apart, I could position legs closer together to make it fit CB750 drum wheel.  Decisions, decisions.

If you are only using stock wheels that could work, make sure you measure at the shock mounts though , they have to line up with the frameto prevent stiction, if my memory serves me well, the GS shock mounts are 5mm a side wider than the 750 arm, I think you'd still have to make custom spacers for the wheel.

[70CB750]

You are right, I think I will make new top shock mounts, just like I made one for Red - weld them in the frame.

[Retro Rocket]

You are right, I think I will make new top shock mounts, just like I made one for Red - weld them in the frame.

Thats what I'm doing...   Interested to see what you end up with here, I never considered a new pivot but now you have me thinking....
I would use the roller bearings though, there is a kit for the Honda sized pivot bolt...

https://www.z1enterprises.com/product/KL31-6923

[70CB750]

Yesterday I put the bottom half of Dorothy's engine on the stand and dug out the box with transmission gears. 

It is time to bring Dorothy back to life 

[70CB750]

I guess this will come handy 

[seanbarney41]

Hell yeah

[RAFster122s]

Glad to hear Dorothy will fly again
David

[70CB750]

With my oldest daughter we played a bit with transmission gears.   I think i will keep all original bearings, replace gears and use the old output shaft.  Keeping it simple.

Chrysler Fiat put Magdalena  through mechanic's training and they assembled 6 speed jeep transmission - I had to show her what a real transmission looks like

[Gurp]

Just re-read your thread this was one of my Favs too keep up with the first time I was on the forum in 2012.
Took a screenshot of your airbox setup as well.

[70CB750]

Just re-read your thread this was one of my Favs too keep up with the first time I was on the forum in 2012.
Took a screenshot of your airbox setup as well.

Thank you

[70CB750]

It took me few years, but I found Don Vesco fairing.  Originally meant for Red, but becaue of the sidebox and because the fairing is frame mounted, I guess I will save it for Dorothy.