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-   -   Project 1976 Yamaha YZ400 (http://www.advrider.com/forums/showthread.php?t=865186)

craydds 02-22-2013 03:00 PM

Project 1976 Yamaha YZ400
 
I just bought a '76 YZ400! I know, it's a sickness. It seems to be all original and unmolested, except for the gas tank. (pics to come later). Seems rare to find an old dirt bike (or any old motorcycle) that has not been tampered with, or TRASHED. The gas tank has been painted flat black - possibly to hide some bondo repaired dents? We shall see. The rear shock has NO damping, none, it is gone. I'll do a shock rebuild search, see if anyone does rebuilds, or possibly can tell me how it's done. Yeehaw, another project!

edit: Is there a YZ400 thread? I did not do a search.

craydds 02-23-2013 05:18 AM

YZ thread!
 
Let's start a Yamaha YZ thread to include ALL the YZ's. I now have two, a 1980 YZ50 and my brand new old '76 YZ400. Remember, they were the FIRST with the MONOSHOCK. That was so cool! Elsinores were nice, Suzooks were good (I had a 125 and a 250), but the YZ's had that monoshock.

heliyardsale 02-23-2013 07:11 PM

Ha! I bought the same bike last week! Here is mine stuffed in my car! I also have a 76' YZ100C and the YZ125X.
http://img.tapatalk.com/d/13/02/24/adety7u6.jpg
http://img.tapatalk.com/d/13/02/24/uqygyvy4.jpg
Bad photo of the clan!
http://img.tapatalk.com/d/13/02/24/7yzupe3e.jpg

heliyardsale 02-23-2013 07:14 PM

Here is my YZ125X
http://img.tapatalk.com/d/13/02/24/7usyhezu.jpg

craydds 02-24-2013 08:27 AM

Quote:

Originally Posted by heliyardsale (Post 20795300)

Wow! That 125 is NICE. I like that gas tank for the 400 shown in the post above. I saw one on ebay but I was unsure about it. I got a Clymer's manual with my YZ400, it SUCKS - conflicting info, etc; I bought an "official" YZ400 service manual from ebay - a gamble, but shall see if it is any better. I see that Racetech can rebuild shocks, may give them a call: http://www.racetech.com/page/id/64 . Got the bike home yesterday and it FIRED on the second kick. Started doing some cleaning up, going to lube everything, etc. I need a rear fender... ebay again? The project begins. (I will get some pics today.)

craydds 02-24-2013 08:50 AM

YZ400 manual
 
Bought this manual on ebay - http://www.ebay.com/itm/260908536395...S:3160&vxp=mtr.

Dirt, ugly, but it's ALIVE:
https://lh6.googleusercontent.com/-n...0/DSCN0458.JPG

craydds 02-24-2013 08:58 AM

https://lh6.googleusercontent.com/-9...0/DSCN0456.JPG
Will get some things cleaned up, lubed, and adjusted today. Take it for an easy test ride in the desert. A 400 cc 2-stroke! Bet it will have AWESOME power.

heliyardsale 02-24-2013 12:27 PM

Lolls pretty good! Don't lose the silencer, they cost huge $$$ to replace.

craydds 02-25-2013 03:54 AM

Need Monoshock Help
 
Rear wheel off. Axle, dirty but in good condition otherwise:
https://lh6.googleusercontent.com/-G...0/DSCN0475.JPG

Rear wheel is good:
https://lh6.googleusercontent.com/-B...0/DSCN0477.JPG

Everything covered in many years of dirt. Rear monoshock bolt ready to come out:
https://lh6.googleusercontent.com/-n...0/DSCN0483.JPG

Swingarm loose. Look at that "inner fender", it's a piece of rubber floor mat:
https://lh4.googleusercontent.com/-x...0/DSCN0486.JPG

Another view of the rear "inner fender". Anyone have a source for the correct part? ebay? :
https://lh6.googleusercontent.com/-n...0/DSCN0468.JPG

The front monoshock bolt needs to be removed:
https://lh3.googleusercontent.com/-6...0/DSCN0484.JPG

That nut is too TIGHT. I cannot get it to budge. Any tips on how to loosen it?
https://lh4.googleusercontent.com/-W...0/DSCN0487.JPG

crg infidel 02-25-2013 07:29 AM

First and foremost, Sweet Bike!!! That is gonna be a ton of fun!

It might be helpful to get some heat on that nut, but not so much you burn up your rubber. You could try a wet rag around the rubber bits, and a little propane torch to warm up that nut. (please be ready to put out fires; I'd hate to hear a horror story :eek1 )

I grew up with old ring-ding Yamahas, and they are great bang for the buck!

Good luck!

craydds 02-25-2013 11:16 AM

Quote:

Originally Posted by crg infidel (Post 20805263)
First and foremost, Sweet Bike!!! That is gonna be a ton of fun!
It might be helpful to get some heat on that nut, but not so much you burn up your rubber. You could try a wet rag around the rubber bits, and a little propane torch to warm up that nut. (please be ready to put out fires; I'd hate to hear a horror story :eek1 )
I grew up with old ring-ding Yamahas, and they are great bang for the buck!
Good luck!

I will try and work it loose this evening. Get out my torch... and fire extinguisher. Ha!

dooder 02-25-2013 12:01 PM

I can't tell from the pic... It's not reverse threads is it?
Cool bike!

craydds 02-25-2013 12:27 PM

Quote:

Originally Posted by dooder (Post 20807135)
I can't tell from the pic... It's not reverse threads is it?
Cool bike!

I thought about that. I looked closely, but I'm blind in one eye... can't see out of the other. I could try to thread a nut onto the exposed threads to verify right vs. left hand threads. I will double-check that this evening.
edit: I zoomed in close on the photo in iPhoto, threads look like right-hand. It is hard to tell, will check tonight.

adventuro 02-25-2013 07:11 PM

If nothing else works you could try a nut splitter, better than screwing up threads on the shock...btw I still have my 78 yz400 that I bought new.

craydds 02-26-2013 12:41 PM

shock progress
 
Quote:

Originally Posted by adventuro (Post 20810610)
If nothing else works you could try a nut splitter, better than screwing up threads on the shock...btw I still have my 78 yz400 that I bought new.

I was ready to buy a nut splitter! But, I used penetrating oil and my torch - slightly scorched the rubber - and got the shock OFF:
https://lh4.googleusercontent.com/-R...0/DSCN0488.JPG

It was really HARD to get that nut to bust loose and I did mess up the threads a bit. Nothing that a die can't fix:
https://lh4.googleusercontent.com/-5...0/DSCN0489.JPG

Will clean up the shock and send it off to Racetech - http://www.racetech.com/page/id/64.

Next step - I want to take the swingarm off. Same thing again - the swingarm bolt will NOT come out:
https://lh4.googleusercontent.com/-x...0/DSCN0486.JPG


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