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  #21  
Old 08-04-2004, 08:30 PM
hardlydangerous's Avatar
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Default Re: 79 yz400

Nothing right now, thanks.
I've got everything i need for the engine re-build, as well as the new side cover, but if I run into anything I'll be sure to llok you up.
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  #22  
Old 09-09-2004, 10:49 AM
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Default Re: 79 yz400

Just a bit of an update
This is it's current condition before paint.
I did decided to rebuild the engine and trans, good thing as the right side crank seal and left side crank bearing were toast.
As for the second drain plug thing that was the neutral indicator pin thing.

All the parts are here and I've just got the crank back. I hope to have the engine together within the next couple weeks.

In the mean time I stripped it down again. I replaced the sterring head bearings and all new cables. in the pic you can see I've started polishing the engine brackets and swing arm. I thought it was all steel but it was just badly corroded aluminum. you can also see the rear fender bracket is busted off so I'll be welding on a new one and re painting the frame before the engine goes back in.
I also found out you can't paint the fuel tank, well you can but it won't stay on there. I ended up stripping all the blistered paint off.
This has turned into a much bigger project then I thought oh well it will be worth it.
I'm just not sure now if I want to keep it for dirt or convert it over to a super moto bike.


Last edited by hardlydangerous; 09-09-2004 at 10:54 AM.
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  #23  
Old 09-09-2004, 11:28 AM
MotoMan's Avatar
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Default Re: 79 yz400

Lookin good Hardly!!!
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  #24  
Old 09-09-2004, 03:08 PM
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Default Re: 79 yz400

I agree. You got it looking fantastic. I also think you'll kick yourself on down the road if you motard it. Be sure to give us some pics along the way!
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  #25  
Old 09-09-2004, 09:35 PM
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Default Re: 79 yz400

That's cool. My bro had an 83 YZ250 and that bike was awesome.

Good luck with it, and yes, keep us posted.
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  #26  
Old 09-13-2004, 02:18 PM
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Default Re: 79 yz400

Thanks guys

Heres the latest pic. I'll post a few pics along the way.
Frame is painted (touched up), polished swing arm and and all new chain rollers and guide components are on, new fender bracket welded in place, as wells as the polished bars. The engine I decides was not going back in stock, so I spent about 7 hours porting it yesterday. Just basic stuff ands i'll mill the head to bump up the the compression a bit to compensate

I'll get some pics when it's done

As soon as the engine is in I'll tear down the forks abd rebuild them, one seal is kinda leaky plus my front tires needs a tube and a few spokes.




BTW
Anyone ever heard of a tire filled with tennis balls instead of a tube?
I just changed the rear tire on a Kawaski 70's G5 and instead of a tube it was stuffed full of green and orange tennis balls.
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  #27  
Old 09-13-2004, 02:22 PM
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Default Re: 79 yz400

Wow.....that is a new one on me man. Tennis balls....someone was a bit hard up for cash and had waaaay too much time on their hands lol.
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  #28  
Old 09-13-2004, 02:38 PM
OLDMXRACER 393's Avatar
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Default Re: 79 yz400

There are a couple of aftermarket companies selling balls for tires now. Moose may be one of them.
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  #29  
Old 09-13-2004, 09:42 PM
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Default Re: 79 yz400

Suppers ready



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  #30  
Old 09-17-2004, 05:23 PM
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Default Re: 79 yz400

HELP
Well I ran into a big problem.
The old seals that came out are nothing like the new style of OE seal.
And now I have no idea the proper way to install them, Yamaha tech's can't say for sure and many of the other guys i've asked say two different things.
Some say the tab side (castle side) faces the crank
other say the castle side faces out.
I've looked at a couple parts fishe cards but can;t tell by the picd.
Until i know for sure this engine is not being put back together.

I'm guessing you the castle side faces in towards the crank and the brown part of the seal is there for heat purposes or something? Why because the right side crank seal has two retainers that keep the seal in place and don't fit real well on the tabs on the castle side.

Right side crank seal







left side crank seal




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  #31  
Old 09-17-2004, 05:35 PM
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Default Re: 79 yz400

I went to the Yamaha parts site and looked on the 79 YZ400 crank page. You can zoom in on the image and enlarge it.

The tabs face the bearings.

Probably there to prevent you from pushing them too close to the bearing and shutting off the oil mist from the gas.
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  #32  
Old 09-17-2004, 08:13 PM
hardlydangerous's Avatar
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Default Re: 79 yz400

Thank you very much sir.

That makes sence and I should have went with my gut in the first place but I just wanted to be 100% sure.
Thanks again
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  #33  
Old 09-18-2004, 11:57 AM
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Default Re: 79 yz400

Gotta love ATM.
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  #34  
Old 09-20-2004, 04:00 PM
hardlydangerous's Avatar
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Default Re: 79 yz400

yes indeed.
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  #35  
Old 06-15-2007, 03:03 AM
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looky here Re: 79 yz400

just bought 79 yz490... i need a intake joint carb... i heard yz400 will fit..
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  #36  
Old 12-03-2007, 08:25 PM
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Default Re: 79 yz400

Where are all the pictures???
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  #37  
Old 12-03-2007, 08:26 PM
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Default Re: 79 yz400

Quote:
Originally Posted by yz490oc714 View Post
just bought 79 yz490... i need a intake joint carb... i heard yz400 will fit..
The 490 hadn't been invented yet in 79'...FB
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