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walkahz

1976 YZ 80C Resto

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My Dad has quite the Bike Collection.

Some of his favourites were the 1976 Model YZ's, Some of the first monoshock bikes and the last series of yamaha with metal tanks.

He had a 125 as an apprentice in the army and used to burn around near the base on the mornington peninsula in the 70's

Like most he had to give up bikes for the family. About 3-4 years ago with all of us kids out of the way he started buying bikes.

He ended up with most of the 76 models as well as some newer yammies.

If it was a yamaha and it was yellow he liked it.

The list is as follows

1976 YZ125X   x2

1976 YZ250C

1976 YZ400C

1980 YZ125G

1980 YZ465G

1977 TT500

To complete the collection he was chasing a YZ80C and was on the lookout for something reasonable to come up.

Unfortunately in October last year he was diagnosed with throat cancer for the 2nd time. This Feb we were told that unfortunately he would not win this fight.

Last saturday while up visiting him for the last time I saw a 80C pop up on facebook for sale and it just so happened that Geoffro was selling it.

I took this as a sign and sent through a message. On Tuesday afternoon I picked it Up!20180313_181527.thumb.jpg.7b88a7e1bd76fc780d16654aa108e28b.jpg 

Its a bit rusty and needs some love but in quite good condition for a 42 year old bike and is very original.

Unfortunately Dad lost his battle on Wednesday morning 14/3/18. I Spent the day in the shed working on His newest bike.

20180314_094859.thumb.jpg.8b67460a0015df807c5a71706d09c486.jpg

Geoffro wasnt able to get her running but admitted to not putting much effort into it. I found that the tank was completely clogged with gunky varnish so no fuel was coming through. I set up a syringe to the carb and gave her 3 kicks and away it went! I made sure it clicked through all the gears then shut it off. Time for the strip down to begin.20180314_095411.thumb.jpg.9e7a271e0de2d0c6d135072be17bbe16.jpg20180314_115605.thumb.jpg.ae42447de9d110d178286acb193f2b1a.jpg

Got it down this far after a few hours. The exhaust nuts are completely knackered so i will need to crack out the grinder to free the exhaust and remove the engine.

 

Plans after that are for a sandblast and paint for the frame and other major components. Then I will have to get into the expensive business of rechroming forks and wheels. I will likely pair this in with some work on the TT500 as its forks need some work as well.

If anyone has contacts for parts or other services like chroming they will definitely come in useful!

20180314_094913.jpg

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My Dad has quite the Bike Collection.
Some of his favourites were the 1976 Model YZ's, Some of the first monoshock bikes and the last series of yamaha with metal tanks.
He had a 125 as an apprentice in the army and used to burn around near the base on the mornington peninsula in the 70's
Like most he had to give up bikes for the family. About 3-4 years ago with all of us kids out of the way he started buying bikes.
He ended up with most of the 76 models as well as some newer yammies.
If it was a yamaha and it was yellow he liked it.
The list is as follows
1976 YZ125X   x2
1976 YZ250C
1976 YZ400C
1980 YZ125G
1980 YZ465G
1977 TT500
To complete the collection he was chasing a YZ80C and was on the lookout for something reasonable to come up.
Unfortunately in October last year he was diagnosed with throat cancer for the 2nd time. This Feb we were told that unfortunately he would not win this fight.
Last saturday while up visiting him for the last time I saw a 80C pop up on facebook for sale and it just so happened that Geoffro was selling it.
I took this as a sign and sent through a message. On Tuesday afternoon I picked it Up!20180313_181527.thumb.jpg.7b88a7e1bd76fc780d16654aa108e28b.jpg 
Its a bit rusty and needs some love but in quite good condition for a 42 year old bike and is very original.
Unfortunately Dad lost his battle on Wednesday morning 14/3/18. I Spent the day in the shed working on His newest bike.
20180314_094859.thumb.jpg.8b67460a0015df807c5a71706d09c486.jpg
Geoffro wasnt able to get her running but admitted to not putting much effort into it. I found that the tank was completely clogged with gunky varnish so no fuel was coming through. I set up a syringe to the carb and gave her 3 kicks and away it went! I made sure it clicked through all the gears then shut it off. Time for the strip down to begin.20180314_095411.thumb.jpg.9e7a271e0de2d0c6d135072be17bbe16.jpg20180314_115605.thumb.jpg.ae42447de9d110d178286acb193f2b1a.jpg
Got it down this far after a few hours. The exhaust nuts are completely knackered so i will need to crack out the grinder to free the exhaust and remove the engine.
 
Plans after that are for a sandblast and paint for the frame and other major components. Then I will have to get into the expensive business of rechroming forks and wheels. I will likely pair this in with some work on the TT500 as its forks need some work as well.
If anyone has contacts for parts or other services like chroming they will definitely come in useful!
20180314_094913.thumb.jpg.322c258ac4e1f921232762e9d058d696.jpg
Sorry to hear of your loss mate.

Good luck with the Resto - look forward to seeing the finished product!

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Your Dad will be proud of you mate, and will be looking down on you, so make it a good resto  ;)

I am more than happy to help with contacts and sourcing the hard to get stuff bud

I too am keen to see the progress and finished product pics

 

Cheers

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Sorry to hear about your dad - unfortunately mine is still alive (long story)

Let us know what parts you are after - one of my fortes is looking for obsolete parts

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Condolances to you and your family mate. I cant wait to see the updates of the tribute bike 

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Walkhaz, mate, so sorry for your loss and condolences to you you and your family.
That's a great collection to treasure; I too am sure he's proudly with you every step of the way on his newest bike.

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Got into the bike again today after i finished with the husky.

Got the air hacksaw onto the exhaust nuts i was struggling with. That got the exhaust off and allowed the engine out.

All other bolts came out easilly.20180317_174753.thumb.jpg.38b9b4503740465d5a1a6aa49bba6a6d.jpg

Whipped the head off the engine to have a peak at the condition of the bore. Looks good but needs a hone and a new slug.20180317_171304.thumb.jpg.0c54a1a8e168cd71e906c7f97146b34b.jpg20180317_171249.thumb.jpg.13016e2c93d34a224804e693f4c9d77e.jpg

 

Only thing im not sure about is the rear shocks. Does anyone know if these can be pulled apart for rebuilding/chroming or will i be on the hunt for replacements?

20180317_174829.thumb.jpg.ffdac4da377ab772dbe3c8d21cd326b1.jpg

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Got into the bike again today after i finished with the husky. Got the air hacksaw onto the exhaust nuts i was struggling with. That got the exhaust off and allowed the engine out.

All other bolts came out easilly.20180317_174753.thumb.jpg.38b9b4503740465d5a1a6aa49bba6a6d.jpg

Whipped the head off the engine to have a peak at the condition of the bore. Looks good but needs a hone and a new slug.20180317_171304.thumb.jpg.0c54a1a8e168cd71e906c7f97146b34b.jpg20180317_171249.thumb.jpg.13016e2c93d34a224804e693f4c9d77e.jpg

 

Only thing im not sure about is the rear shocks. Does anyone know if these can be pulled apart for rebuilding/chroming or will i be on the hunt for replacements?

20180317_174829.thumb.jpg.ffdac4da377ab772dbe3c8d21cd326b1.jpg

 

Under the rubber bumper there should be a nut that allows you to remove the spring. It's not under much pressure but be careful

. Once you pull the springs you can check to see if the shocks have any dampening left. If they seem to work, the shafts aren't pitted and it's more a show bike than racer. Clean the rust and shoot them with black epoxy. You can shoot the ramped spring preload collar in yellow to mock Koni or blue for S&W.

 

Good on ya for finishing up what you're dad started, good luck!

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Hi there Walkahz,condolences on the loss of your dad,I got my forks for my yz80 rechromed at rad hard chroming in qld (I think it was a while ago)my forks were pretty shot and needed a fair bit of welding,repair work.The actual chrome he uses is really tough like industrial chrome used on hydraulic rams etc and will last the lifetime of the bike easily,both forks cost $300 plus post and they are back to better (tougher) than new.a919e27884766c335485621160580217.jpg

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Took the frame and exhaust into work today to put in the shot blaster.

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Before a very dirty and rusty frame

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After. Back to fresh steel and ready to prep for paint. After straightening a few tabs first.

Nice aggressive shot allowed me to get this done in less than an hour. Much better than days wire wheeling.

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Taking advantage of the public holiday today got a fair bit done.

Shot the frame and swingarm in primer ready for black later in the weekend.

Most of the day was spent on mad backyard science! Home brew zinc plating.20180329_181356.thumb.jpg.e05ead49cf82d958e08a0b30f2664fef.jpg

Takes a bit of time but reasonably simple. Some acid to etch and clean the parts, rinse in water then hang in the zinc bath (a super dangerous mix of chemicals vinegar sugar and epsom salts) hook it up to a battery charger or other power source and bobs your fathers brother.

Main thing is good prep. All rust, pitting, grease and dirt must be removed and the part must have a good finish as the zinc will not cover up the roughness.20180330_100512.thumb.jpg.62a592a3ccd6fb67d01573565edb93a1.jpg

Rear axle assembly before.

20180330_144912.thumb.jpg.320d9e5e462b3ba3f42d35ed6d14c770.jpg

And after.

 

Will post up once the frame is painted.

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That comes up fantastic mate. Maybe if you find some time you could do a demo video or write a detailed process for us all in its own thread

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Sorry to hear about your loss mate.

What an awesome testimonial to your dads passion!

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Been a bit busy over the last week as the wife popped out our first little one. 

Before bub came along i got the frame all painted up.20180401_084354.thumb.jpg.e4306110bf4b894db66a7b3e3bf3ab88.jpg20180401_095159.thumb.jpg.b961d6f3ac843844357d206f680deccf.jpg

 

the wife was having a snooze this afternoon so I took the little tacker to the shed for bike time. Managed to bolt the swingarm back to the main frame along with a few other bits and pieces. 

will be slow progress for a while as i chase parts.20180406_165151.thumb.jpg.c40401eec1a8cca5e44be5c7d59fdfbb.jpg20180406_155217.thumb.jpg.1d0be86b24a01b28e5ff3c747bb684b6.jpg

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More shed time today. Cleared the bench of the 125 engine that has been on there for the last few months as i finally went to a yamaha dealer to buy some parts I was missing.  This one will sit on the bench for a while till I get back to sydney to fit it in the bike its out of.

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This gave me room on the bench to pull the 80 motor apart to find what it needs. 20180414_155648.thumb.jpg.06958eee04cbf0fa027d716eeb7d0400.jpg

Piston was loose a a goose so it will need replacement.

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The Japanese engineer who decided phillips/jis screws on an engine was a good idea should be shot. These were destroyed long ago. Still trying to get them all out.20180414_155235.thumb.jpg.d03d8472de5369f425fe615a7a8f9ed4.jpg

 

Clutch cover off and all looks good20180414_155642.thumb.jpg.97743cc22959672d658df80ce81abb57.jpg

 

 

Till i get the basket off and find this20180414_162634.thumb.jpg.b7b1919771d98706da8e23ba8bcb887e.jpg

The missing piece wasnt in there so removing it must of been when someone butchered the screws.

 

Everything looks good apart from a few small bits. Need to remove 3 more screws before i can split the cases.

Then i will work on slowly reassembling.

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46 minutes ago, walkahz said:

The Japanese engineer who decided phillips/jis screws on an engine was a good idea should be shot. 

No argument from me - I've got a '74 Honda K1 ATC70 patiently waiting for restoration that is lousy with the dam things lol

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Sincere condolences on your loss.  I disagree with the JIS screws though. I reckon they bite well if you use a JIS screwdriver. If 13 previous owners haven't already munted them with a Philips driver.

In fact a good JIS driver will get a munted screw out far better than the Philips that munted it.

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I love having a lathe!

Knocked up a flywheel puller tonight in about 45min. Saves spending $30 on one!20180426_192323.thumb.jpg.2756bc5a63c7c47a29d14740ec2bbddd.jpg20180426_192206.thumb.jpg.071ef83e3e24414ed90dca5b240a392e.jpg

whoever worked on this bike previously needs all screwdrivers removed from their possession!!! More bloody stripped screws!!!20180426_192328.thumb.jpg.b815c060e23c9e1aec558afa08b69e49.jpg

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Engine finally stripped.

Removed all the damaged screws finally... ended up drilling the heads off all of them that didnt come out with the impact driver.

20180429_134800.thumb.jpg.c7567bb601982f753f0c363223e5def2.jpg

Put everything in the parts washer and gave it a blast with the pressure washer in the attempt to remove 42 years of grime.20180429_151400.thumb.jpg.2bc434038d15cef5eba7b6659ce18d4b.jpg

Now to put the covers into the bead blaster and repaint everything before reassembly.

Not planning on replacing the bearings in the big end only planning on replacing the piston. This bike isnt going to be ridden much or raced so as long as its a good runner i will be happy.

Also painted some other parts ready for assembly.

 

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Found that the stator side cover had a crack so out came the tig to fix it all up. Took a few goes as welding cast stuff sucks!

20180515_130048.thumb.jpg.fbf8b8a1e5ac3fadf440c98c6d6e93e6.jpg20180515_133615.thumb.jpg.fcafdbc47ba57a0dfc16cd822e8072e2.jpg

been getting a fair few bits and pieces from yamaha directly that are still available. Mostly things like rubbers and other small parts.

I have just finished buying a whole heap of parts from america. Both from ebay and dc vmx.  Those bits should arrive in the next week or 2. 

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15 hours ago, Sabre said:

Any bits youre struggling to find ?

Not really. Most things are either direct from yamaha or there is lots of nos parts in the states....at a price. Like most old bikes oem plastics are near on impossible but i have revived most of the ones on the bike. Only one I brought from DC was the rear guard as the old one I couldnt get up to a level I was happy with. It also helps the bike was pretty complete to start with. 

Main things left to spend money on are a piston and getting the wheels,bars and forks re chromed.

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