My CBX1000C Restore Project

[bobcat]

Very clever, nicely done !

[Jeff Bennetts]

How much to make a couple? I’m interested!’

[NobleHops]

Incredible!

[heli_madken]

How much to make a couple? I’m interested!’

Thanks everyone!

Jeff, it is easier for me to post the files here so you can download them (FOC) and get them printed via a bureau service like ShapeWays or if you know someone with a 3D printer (any printer will do with a print bed bigger than 100mm2) printing them is straight forward.

Here is the link - https://files.fm/u/482wpfmnn

It is important to note that I designed this version specifically for the VB series of carbs fitted to the CBX so it wont fit other carbs as the position of the floats, jet towers and fixing points are all different.

Incidentally after a lifetime of modelling small and very large scale, rebuilding cars and motorbikes as well as other hobbies my three 3D printers are by far the best tools I have ever come across. I seldom use my mill and lathe now I 3D print everything it is just so easy. If you dont have one I would very seriously consider buying one although most people find the hardest part is learning to draw in 3D.

[Jeff Bennetts]

Thanks for the link, I do have a 3d printer source, I’ll look into it.

[Syscrush]

I designed and 3D printed this -

Wow - this is amazing. Good on you for coming up with such a cool technique and for sharing the details of it here.

Wonderful stuff. That bike had better run perfectly, you've earned it with this!

[hondaman160mph]

Brilliant !

[heli_madken]

Thanks for the comments everyone much appreciated.

Back to business - checked valve clearances and found them all outside spec, some way to wide (which surprised me) and most a little too tight. I cant seem to find the answer to this question, obviously I need to remove the shims to determine their existing size before ordering new but do I need to then replace each shim to rotate the cam and move on to the next or can I leave the shim out?

In other words is it safe to rotate the cams against the bare bucket or will this damage anything?

Thanks, Ken

[daves79x]

NO! Do not rotate the engine with an empty shim bucket. Aim for .004-.005 inch clearance.

Dave

[heli_madken]

Thanks Dave,

Now for the next question. At present I can only find shims over here that are in 0.05mm increments. So in this example I have a clearance of 0.04mm and shim fitted which is 2.8mm. To get to a target 0.12mm gap I would need a 2.72mm shim which I cant find. A 2.7mm shim would take me to 0.14 which is just outside spec or a 2.75mm would get me 0.09mm which is within spec.

So am I right in assuming its not possible to achieve a single even figure for all tappets and as you say just aim for a gap within the tolerance you stated. If so are you better going to a wider gap rather than narrow?

Sorry havent done inches in over 50 years!

[Larry Zimmer]

Dave can chime in. However, I'll say go wider. Typically, valves will 'seat in' over time. Thus, making thing s tighter. After initial seating, things usually do not change much. Go big. Might be a tad noisier. 25 micron won't hurt. Best I know, only the factory ever had shims of fractional increments.

[heli_madken]

Thanks Larry, in some instances to go wider means going to a gap of 0.14mm I have read elsewhere that this is acceptable, would you say this is better than the alternative which would be 0.09mm?

[EMS]

Don't know how you determine the thickness, but you should use a Micrometer and measure. The thickness number printed on the shim is not exact.
If you measure the shims that are marked 2.70 and 2.75, you will find one that is between these values.

[Marten]

You got some skill on the 3d printer, also

Great work.

[cbxmel]

Welcome Ken, Quite a few cbxers in Scotland. In the ICOA ,cbx riders club and VJMC so loads of cbx knowledge out there. I am told I have the largest cbx archive on the planet so can always try to help if I can.
Mel 1876