Kawasaki Z650 Seventies Special

Bevelheadmhr

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We hit another hiccup when dropping the block onto the pistons, one of the oil scraper rings caught and damaged. Its really a two an job, but due to social distancing it had to be done alone. Also when the block is rebored, it loses a slight chamfer at the base of the liners which help the rings compress as they enter the bore.

Not a big problem normally, except the rings for these pistons are no longer available... oh well, I never liked the idea of using those (slightly) used pistons anyway, so now the engine is getting a new set of forged pistons instead.

On a more positive note, I've bought a mint front end from a 2001 Yamaha R6 which a mate is breaking
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.. its 43mm forks, calipers and discs will be used on the Zed, in place of the 41mm Suzuki forks I've used so far. It means a new set of billet yokes, but that's ok, my mate Jeff has a few sets of half finished billet yokes, one of which can be used for the Zed. While work has started machining the pieces to make the billet clutch cover and points cover.
 

Bevelheadmhr

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The billet engine covers are progressing ok, the points cover is done, while the more complex clutch cover is around 80% done.. it needs its top bevelling and drilling to take an oil level site glass, before being polished. We're making three altogether, as its not much more work than making just one.

The next problem is how to add the famous 'DOHC' into the points covers, and perhaps 'Kawasaki' into the clutch cover. I was thinking about engraving DOHC into my points cover by hand, using a Dremel, but I doubt I could replicate the 'Kawasaki' logo accurately enough to make it worth doing.

I need to find somewhere who can engrave the covers, without charging a fortune, or maybe have a badge laser cut and inset into the cover. Not sure.

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ridesolo

You only bear responsibility for your own actions
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Have you thought about having vinyl stickers done that'll work as masking, you might have to get them done as "negative" then use a sand or bead blaster to get the effect you want?
 

irk miller

You've been mostly-dead all day.
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I etch my stuff. Saline etching, with copper sulfate and salt, is super cheap, really easy and relatively low toxicity. I use vinyl as a resist most of the time.

 

doc_rot

Oh the usual... I bowl, I drive around...
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If you want to spice it up with something different than DOHC supply a vector drawing of this points cover.

shiney.jpg
 

Bevelheadmhr

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Thanks for the ideas, I looked at a few YT vids, one shows a method that uses sat water and an electric current (supplied by a battery charger). When I have time, I may experiment with some scrap alloy plate.

Meanwhile, the clutch cover is finished, bar some cleaning up and polishing..

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Bevelheadmhr

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Not much progress the last week or so, still waiting for parts, though I did collect the ZRX swingarm from the powder coaters, they did a good job as usual, finish is gloss black to match the frame, which still needs more work before it too an be powder coated.

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Bevelheadmhr

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yep no powder where you dont want it. Looks great.
I always use the same place, which specialises in bikes.. frames, engine cases, wheels etc. I once asked how they got such a good finish compared to other powder coaters... The answer was that they paid 3 times the normal cost of 'normal' powder to have the finest ground powder available. Oh and they also blank off all threads and bearing surfaces etc.. saves a huge amount of time when you get the frame back home.
 

Bevelheadmhr

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Quick mock up with the rear wheel and brake.. the wheel spokes will be painted, probably black or maybe gold..
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Bevelheadmhr

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Another small piece of the jigsaw done, the billet clutch cover is polished (I hate polishing!) and ready to go on the engine .

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Jimbonaut

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This ship has probably sailed by now but if not then you might find this trick uselfu when installing your cylinder. I'm a one-man show and know what you mean - having an extra set of hands around for some of these jobs would really help. I attach cable ties to the outer cylinder studs, and use them to gently lower the cylinder as needed. They're strong enough to hold the cylinder in place, but moveable enough to lower it when you need to as well. I've used this technique on both a single cylinder thumper engine and a heavy old CB750 inline 4. Works a charm.


 

Bevelheadmhr

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It certainly helps if you have ab extra pair of hands, and eyes when dropping the block over the pistons, sadly that wasn't possible at the time due to the lockdown. Also boring out the cylinders means they loose the slight chamfer they have at their base, which is there to help get the pistons into the cylinders. I've now decided to have the block taken out to 75mm from 73.5, as 1170 pistons kits are available, unlike the 1120 pistons I intended to use originally. Meanwhile the head has gone off to Leeds to be rebuild by the Zed head expert in the UK. Hope to have it back in two weeks, when the engine can finally go back together.

Here's the cover loosely bolted to the cases..

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3DogNate

"You Meet the Nicest People on a Honda"
This looks great man. I want to do a KZ 4 cyl soon. I always keep my eye out for a Non-LTD KZ most I run across are total basket cases or people think they have something worth a fortune. I’ve missed a few because I was slow.

Nice job.
 

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