Topic: CB750 K3F - AKA The Red

[70CB750]

The set of new to me Ikon shocks - thanks again, Hondaman -   resisted all shop hack solutions.  So i spent several hours making a tool from an old axle. I even hardened it in oil bath. I am glad I did, it took 4 feet pipe to losen up the nut. 

The plan is to rebuild the shock and get a set of springs for Red.  The sidecar and my fat ass makes her bottom out too easily.

It ain't pretty, the 1/2" nut lets me use a bolt for handle. 

[70CB750]

Just documenting. 

[Stev-o]

How does Red like the hack?!

[Alan F.]

Looks good.

[70CB750]

How does Red like the hack?!

It keeps her warm, she has to work harder than solo bike.   

[MauiK3]

You need the top box with the side car?

Nice looking setup.

[Alan F.]

Good question, does the sidecar seat tilt forward to access storage behind?

[70CB750]

The top box is handy and I am used to it. 

The back of the seat in the sidecar can be completely removed.  In theory it is locked - but my lock was busted, I have to bring new one from home/Czech.

[grcamna2]

If it was me,I would find a tiny hubcap for the sidecar wheel 

[70CB750]

If it was me,I would find a tiny hubcap for the sidecar wheel 

It needs it, doesn't it? I was thinking about machining down CB750 sprocket hub but it would be too much work and weight.  I should find and cut out some 6061x1/4" for it.

[grcamna2]

If it was me,I would find a tiny hubcap for the sidecar wheel 

It needs it, doesn't it? I was thinking about machining down CB750 sprocket hub but it would be too much work and weight.  I should find and cut out some 6061x1/4" for it.

I think you might find one from another vehicle;now it's on your 'radar' so you see one.
A fancy wheelchair type vehicle perhaps 

I'm thinking a vintage car,something from the 60's may have a small hubcap to fit right over there;Honda S800 ? 

[Stev-o]

If it was me,I would find a tiny hubcap for the sidecar wheel 

It needs it, doesn't it?

Actually a great idea.  Maybe something like this? [I dont know diameter]

https://www.ebay.com/itm/113714751950?hash=item1a79ed69ce:g:t9QAAOSww-ddvhDv&amdata=enc%3AAQAHAAAAoMCpHR1bxmEntxBZc5dqQgPqMzoMXQ6v0PVc%2Fk0P97uT5uRADmd9cVXT90cjTDtRhXjkCtO%2BdY%2BBJFgRRv3yBlIv8BiqB%2BGjx0pZmjIFyq1TcE0g6YCvxajAM7HBRGxUJRmX710%2F6ZrgCRtRtKGfdMoDd9%2BlOqRoY39jhLaoLkCSpJw5rjsVksCCanTUjOeazgwfYbx2rVUXiIfCohVXDIw%3D%7Ctkp%3ABk9SR-aK06KiYQ

[grcamna2]

If it was me,I would find a tiny hubcap for the sidecar wheel 

It needs it, doesn't it?

Actually a great idea.  Maybe something like this? [I dont know diameter]

https://www.ebay.com/itm/113714751950?hash=item1a79ed69ce:g:t9QAAOSww-ddvhDv&amdata=enc%3AAQAHAAAAoMCpHR1bxmEntxBZc5dqQgPqMzoMXQ6v0PVc%2Fk0P97uT5uRADmd9cVXT90cjTDtRhXjkCtO%2BdY%2BBJFgRRv3yBlIv8BiqB%2BGjx0pZmjIFyq1TcE0g6YCvxajAM7HBRGxUJRmX710%2F6ZrgCRtRtKGfdMoDd9%2BlOqRoY39jhLaoLkCSpJw5rjsVksCCanTUjOeazgwfYbx2rVUXiIfCohVXDIw%3D%7Ctkp%3ABk9SR-aK06KiYQ

That one's a great deal 

[70CB750]

If it was me,I would find a tiny hubcap for the sidecar wheel 

It needs it, doesn't it?

Actually a great idea.  Maybe something like this? [I dont know diameter]

https://www.ebay.com/itm/113714751950?hash=item1a79ed69ce:g:t9QAAOSww-ddvhDv&amdata=enc%3AAQAHAAAAoMCpHR1bxmEntxBZc5dqQgPqMzoMXQ6v0PVc%2Fk0P97uT5uRADmd9cVXT90cjTDtRhXjkCtO%2BdY%2BBJFgRRv3yBlIv8BiqB%2BGjx0pZmjIFyq1TcE0g6YCvxajAM7HBRGxUJRmX710%2F6ZrgCRtRtKGfdMoDd9%2BlOqRoY39jhLaoLkCSpJw5rjsVksCCanTUjOeazgwfYbx2rVUXiIfCohVXDIw%3D%7Ctkp%3ABk9SR-aK06KiYQ

Thats cool but to match the bike.  I have to make the cover myself.  Might make it look a like the comstars.

[70CB750]

Red had a flat front tire. Nothing dramatic, i was just checking pressure at home and it was 15psi.

Turns out the new valve I installed when replacing the tire was leaking. I usually run NAPA 90426 valves in my Comstars, but this time I used a different type.  Luckily  the rear wheel and the sidecar wheel are still NAPA.   Tonight I dismounted the front tire and installed NAPA valve from my road kit.  Gotta buy more of those and toss all the new type valves. 

[Stev-o]

Red had a flat front tire.

My K4 front tire was totally flat last week. I mentioned it to my buddy and he said to check the valve with a little water after inflating. Sure enough, it had a leak. I removed the core and wet the ring, reinstalled and has been good since.  Guess it just dried up and leaked.

[70CB750]

Red had a flat front tire.

My K4 front tire was totally flat last week. I mentioned it to my buddy and he said to check the valve with a little water after inflating. Sure enough, it had a leak. I removed the core and wet the ring, reinstalled and has been good since.  Guess it just dried up and leaked.

Thats a good tip, thank you.  Mine was leaking between the rim and the valve.  I use these to run tubeless tires on Comstars not intended to be tubeless. This was my first issue ever with this "illegal conversion".

[RAFster122s]

My 78 CX has Comstars and they are marked Tubeless. Are yours marked Tube?

[70CB750]

My 78 CX has Comstars and they are marked Tubeless. Are yours marked Tube?

Interesting, I believe for CB750 they went tubeless in 1979.

My wheels are 78 and there is no marking on them.  I did a lot of research before I went that route, but it worked out well.  The only difference from tubeless rims is the valve hole. Some people tap it and use a valve from water tank, but that NAPA valve works for me. 

[grcamna2]

I've changed a few tires on different wheels and added valve stems to wheels.
I notice there is a difference between wheels that are marked 'tubeless tire applicable' and those that are not.
The wheels that are marked Tubeless have very wide bead surfaces inside with a designated 'lip' on the inside edges of each bead shoulder that makes it a bit more difficult to 'seat' the beads initially when installing the new tire.
The Tubeless designation on the wheels has a safety feature in case the tire was to have a blow-out and instantly run flat while a person is riding it:the tire stays 'seated' when that happens. I haven't had that happen to me,and God help me if I did.. 
A tire could conceivably lose bead contact as I'm describing which would wrap the tire up around the rim in a strange way and expose the metal rim surface to the road;to me that's a 'worse case scenario',especially on a Front while I'm going around a corner.

I had a set of Suzuki mags which comes on the GS1100E that is meant to have tubes installed and these wheels have very small bead surfaces inside the rim with no inner 'lip' on the edge. I installed metal valve stems into them and mounted a pr. of Metzeler tires and they held-up well,the metal valve stem had a slow leak,which was a problem;I had never considered what would happen if I was to lose All the air in the tire at once.. although that rarely happens.

[70CB750]

I never compared tube and tubeless Comstars but I believe the only difference is the valve.  The rim is pretty deep, it actually takes some effort to unseat the bead.

[grcamna2]

I never compared tube and tubeless Comstars but I believe the only difference is the valve.  The rim is pretty deep, it actually takes some effort to unseat the bead.

I remember drilling-out and chamfering a valve stem hole on one of my non-tubeless tire aluminum wheels in the past;to accept a larger O.D. and better sealing rubber valve stem...  I hope it hasn't caused anyone problems.