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  #61  
Old 17th October 2018, 11:33 AM
kad kad is offline
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Motorbike: ltd1000 zx12
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Default Re: Classic Z900 Restoration (76 A4)

Ive one or two marks on the side casing i want to polish,am i stuck with the marks or is there anything i can put in them that will buff up.think there on the deep side for sanding out
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  #62  
Old 18th October 2018, 01:02 AM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by kad View Post
Ive one or two marks on the side casing i want to polish,am i stuck with the marks or is there anything i can put in them that will buff up.think there on the deep side for sanding out

You could try polishing, you'd need soap (A hard block of polish) loaded onto a bench polisher. That would bring it up like chrome and would be better at 'disguising' the marks, but it will dull down after a bit and they're back.

I've had to file some down and then sand gradually back to smooth & polish. Freaks you out to take a file to a smooth casing, but when blended back and sanded, as its soft, its easy enough to get it back to what it should look like.
(Have a look at the fork nuts on post #40)
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  #63  
Old 18th October 2018, 02:08 AM
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allsorts&oddjobs allsorts&oddjobs is offline
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Default Re: Classic Z900 Restoration (76 A4)

Just asking for a friend like...........whats a Z900 of 76 or 77 vintage worth, its in roughish original condition but runs and rides perfectly, non standard exhaust cans , all there and very solid but lots of 'patina' , rough idea of value would do, thanks lads.
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  #64  
Old 18th October 2018, 10:58 PM
kad kad is offline
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Motorbike: ltd1000 zx12
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Default Re: Classic Z900 Restoration (76 A4)

Just look at the thread from the begining jasus you'll some work put into that all credits due..its my clutch casing that has a few marks much worse than your nut think ill just polish it kinda my second /spare engine the org one will be going back into her in time.another strange one for ye the oil viewing glass is marked obscure anyone ever change on ive never seen one for sale even on zpower
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  #65  
Old 19th October 2018, 01:37 AM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Saw them on z power .. 5 pages. Its there somewhete.
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  #66  
Old 19th October 2018, 01:49 AM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by allsorts&oddjobs View Post
Just asking for a friend like...........whats a Z900 of 76 or 77 vintage worth, its in roughish original condition but runs and rides perfectly, non standard exhaust cans , all there and very solid but lots of 'patina' , rough idea of value would do, thanks lads.
Meh.. money jumps depending.
Mudguard. Cans. Seat. make massive differences even though they are available in repro.
The rest is based on ability to return to std.
I've no idea. I've between 2.5 to 3.5 in MY head but dependant on orig colour. Origin.
Pic would tell a lot.
UK market asking could be 4.5
Mint orig UK 10-12. Paint brushed with notions ... 10.
I recon best price is based on someone with money looking for a finished example.
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  #67  
Old 19th October 2018, 08:03 AM
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allsorts&oddjobs allsorts&oddjobs is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by Airman View Post
Meh.. money jumps depending.
Mudguard. Cans. Seat. make massive differences even though they are available in repro.
The rest is based on ability to return to std.
I've no idea. I've between 2.5 to 3.5 in MY head but dependant on orig colour. Origin.
Pic would tell a lot.
UK market asking could be 4.5
Mint orig UK 10-12. Paint brushed with notions ... 10.
I recon best price is based on someone with money looking for a finished example.
Ok thanks for that Airman
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  #68  
Old 19th October 2018, 10:38 AM
kad kad is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by Airman View Post
Saw them on z power .. 5 pages. Its there somewhete.
👍thanks ordered stuff twice now dont know how i missed it
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  #69  
Old 20th October 2018, 12:40 AM
Daithia10 Daithia10 is offline
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Default Re: Classic Z900 Restoration (76 A4)

Lovin' the thread Airman. A mate sold a running but rough z900 recently for €4500.
I have a Z650 that needs a little tlc when time and bobs allow.
What did you use to restore your crankcases? Im working on a BSA here and cases are in very poor nick.
Dave
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  #70  
Old 21st October 2018, 12:57 AM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by Daithia10 View Post
What did you use to restore your crankcases? Im working on a BSA here and cases are in very poor nick.
Dave
Because I ripped it down to parts, I was able to blast the casings.
From there it was a case of getting the finish from dull to 'blueish bare aluminium' using acid (Tried path cleaner, sulfuric acid - Battery, rust remover solution)... not sure if any worked well, or was it just the rubbing on the blasted parts.
Then sprayed a tin of ACF50 on them and polished it in. - this stuff seems to work like soak-able oil, where it seeps into the surface (A waste of €20 unless the casings are clean first)
A bit of elbow grease to finish off.
Though being .. the ACF50 would soak into the Ally to stop oxidization and leave a nice finish.

If you can't blast them, I'm not sure what else will get any deep dirt out as it seems to absorb the crap into the old casting.
Scotchbrite followed by Autosol is another option if you don't mind wearing the tips of your fingers off.
And.. 'British' Aluminium casting I think is better than Japanese so I think its harder to deep clean but easier to polish.
Hope that helps some bit

Last edited by Airman; 21st October 2018 at 01:00 AM.
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  #71  
Old 26th October 2018, 11:29 PM
Daithia10 Daithia10 is offline
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Default Re: Classic Z900 Restoration (76 A4)

Thanks Airman. Looks like a HazCem suit may be required. The ACF50 looks like great stuff so may give it a go. Keep spannering. �� D
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  #72  
Old 7th November 2018, 10:01 PM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Threw some fuel into the carbs to start the tuning.
Feckin pissed out everywhere.
( I forgot to check the float heights before I put the carbs back)

Carbs have a little needle valve that shuts off the fuel as the bowl fills, The floats rise and a 'tang' pushes against the needle valve stopping the carb from overfilling.
You can see on the second tang, there is a pip mark in the center, which means at some point the float was installed upside down (which can't work as there are small cut outs to allow it to rise and fall freely)
Mine pissed cos the float was catching against the side and was not able to move.

Click the image to open in full size.

Open the book to see what the height should be and it says .. to adjust ... remove carbs .. NOOOOOoooooo

Done them in situ. awkward pain in the arse.
Bend tang, fill carbs, attach a tube from the underside of the bowl and measure against the side 2-4 mm

Click the image to open in full size.
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  #73  
Old 7th November 2018, 10:04 PM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Rear tail fitted

Click the image to open in full size.

Side Panels fitted

Click the image to open in full size.

Seat ... dun
Timing & balancing tomorrow

Click the image to open in full size.
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  #74  
Old 7th November 2018, 10:29 PM
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the landshark the landshark is offline
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Default Re: Classic Z900 Restoration (76 A4)

Looking well Airman.
Thats a handy trick with the carbs, I had mine in and out so many times trying to find that leak in the bowl i nearly cried.
Is that a new seat or did you recover the old one?
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  #75  
Old 7th November 2018, 10:37 PM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Was covered before I got it over 10 years ago, still like new. Apparently they're not supposed to have a strap, but IMO .. looks better.
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  #76  
Old 8th November 2018, 12:09 AM
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allsorts&oddjobs allsorts&oddjobs is offline
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Default Re: Classic Z900 Restoration (76 A4)

Love this thread, beautiful bike.
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  #77  
Old 8th November 2018, 12:31 AM
kad kad is offline
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Motorbike: ltd1000 zx12
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Default Re: Classic Z900 Restoration (76 A4)

Fair your doing all the hard work for us..its a credit to you..must be a great feeling when she fires up after all the work
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  #78  
Old 8th November 2018, 01:12 AM
Jfarrell32 Jfarrell32 is offline
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by Airman View Post
Rear tail fitted

Click the image to open in full size.

Side Panels fitted

Click the image to open in full size.

Seat ... dun
Timing & balancing tomorrow

Click the image to open in full size.
Looks like a super finish. When will u put it on the Market? Or will u run it for a while?
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  #79  
Old 11th November 2018, 01:26 AM
Airman Airman is offline
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Default Re: Classic Z900 Restoration (76 A4)

Soo...
The tuning didn't fair out too well.
She started and then roared off to 5K on idle with the idle screw backed out all the way.
Stripped the carbs again.
Nothing much found but one pilot jet was tight but half out.

Click the image to open in full size.

Put it all back and settled down a bit, but a bit to do yet with the air and Slides etc. Slide syncing is a pain as these carbs have two studs holding the slide. bit finicky ... loosen one, and pull or push against the other.

Click the image to open in full size.

One other thing that seemed to make a difference to the high RPM.
Machined a location slot in the magnetic disc which caused it to tighten closer than before. A hair away from making shit of the coils
Put a spacer in and backed it out a bit,
For some reason, the idle dropped to about 3.5K from 5 after this ... Fluke ?

Click the image to open in full size.

Anyhows... Sorted (Thanks to a few directions from here)
Next... onto the tank. the last piece.
Some amount of crap in it even though there is no major signs of rust.

Click the image to open in full size.

Done Done tomorrow ...
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  #80  
Old 11th November 2018, 04:09 PM
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-alan- -alan- is online now
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Default Re: Classic Z900 Restoration (76 A4)

Originally Posted by Jfarrell32 View Post
Looks like a super finish. When will u put it on the Market? Or will u run it for a while?

Yeah - finish looks about 1/2 inch deep. Love that metallic green.

Originally Posted by Airman View Post
Machined a location slot in the magnetic disc which caused it to tighten closer than before. A hair away from making shit of the coils
Put a spacer in and backed it out a bit,
For some reason, the idle dropped to about 3.5K from 5 after this ... Fluke ?
Maybe. Dunno how those things work, but if you move the disk away from whatever sensor is on the inside, then the mag field rotating past the sensor will be weaker, which could well have an effect on the timing/strength of the spark ?

Last edited by -alan-; 11th November 2018 at 04:12 PM.
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