1981 YZ465

MXDAD140
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MXDAD140
Edited Date/Time 4/29/2018 9:14am
Alright guys. I finally pulled the plug and bought a 1981 YZ465. Going to pull everything down and looking to see what all she will need. Just hope this artificial hip will start her up. And she does have a decompression in the cyl head. What do y’all think?



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newmann
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newmann 2/8/2018 9:35am
2/8/2018 9:35am
Looks like an excellent starting point. I may have a few misc. parts laying around for a 465 if you need something.
MXDAD140
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MXDAD140 2/8/2018 9:38am
2/8/2018 9:38am Edited Date/Time 2/8/2018 9:49am
newmann wrote:
Looks like an excellent starting point. I may have a few misc. parts laying around for a 465 if you need something.
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MXDAD140
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MXDAD140 2/8/2018 9:39am
2/8/2018 9:39am
newmann wrote:
Looks like an excellent starting point. I may have a few misc. parts laying around for a 465 if you need something.
Thanks. I’ll be making me a list soon. It has a 490 bottom end in it.

The Shop

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GIwasB4
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GIwasB4 2/8/2018 1:12pm
2/8/2018 1:12pm
Looks like a great candidate. Check your frame for cracks or breaks.
I have one that looks similar and the frame has stress cracks at several weld points.

On that note: anyone know if the 81' 250 frame is the same as the 465?
wfoyz250
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wfoyz250 2/8/2018 1:29pm
2/8/2018 1:29pm
beware of the front downtube. Check it very closely for horizontal cracks in the area level to the DG badge on the pipe. I had a crack develop there and had it welded up before it got outta hand.
If there's nothing wrong, keep an eye on the downtube from time to time.
450exc115
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450exc115 2/8/2018 3:37pm
2/8/2018 3:37pm
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol

I'm working on upgrades to the rear shock like real valve piston and a Fox remote reservior with compression adjuster. Should be a lot of fun when done!
GIwasB4
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GIwasB4 2/8/2018 3:47pm
2/8/2018 3:47pm
450exc115 wrote:
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol I'm...
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol

I'm working on upgrades to the rear shock like real valve piston and a Fox remote reservior with compression adjuster. Should be a lot of fun when done!
Thanks for the info on the 250 frame. Did you say Fox shock? I need to get a frame for this one.


wfoskir
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wfoskir 2/8/2018 9:03pm
2/8/2018 9:03pm
450exc115 wrote:
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol I'm...
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol

I'm working on upgrades to the rear shock like real valve piston and a Fox remote reservior with compression adjuster. Should be a lot of fun when done!
GIwasB4 wrote:
Thanks for the info on the 250 frame. Did you say Fox shock? I need to get a frame for this one. [img]https://p.vitalmx.com/photos/forums/2018/02/08/242763/s1200_ftc.jpg[/img]
Thanks for the info on the 250 frame. Did you say Fox shock? I need to get a frame for this one.


I have an 81 YZ250 frame, I will sell. Do you have any other after market YZ goodies you would sell? Anything for 1980 YZ125?
AHRMA361
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AHRMA361 2/9/2018 3:09pm
2/9/2018 3:09pm
450exc115 wrote:
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol I'm...
Nice find of a great bike. 250 frames are the same and looks like a better starting point than the one I picked up! Lol

I'm working on upgrades to the rear shock like real valve piston and a Fox remote reservior with compression adjuster. Should be a lot of fun when done!
Race Tech did my 1981 YZ250 shock. Different valving, dual rate Eibach springs. Awesome workmanship and works beautifully.



captmoto
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captmoto 2/10/2018 2:55pm
2/10/2018 2:55pm Edited Date/Time 2/10/2018 3:16pm
A later model YZ two stroke throttle will work perfectly and I think you get a little more reliability from it. I've run the old whirlpool style throttle and prefer the modern version. The original throttle housing from that year will set you back $150 at least when they come up on Ebay. I am also running a late model clutch perch and lever with the quick adjust. Use OEM cables for clutch and brake if you can find them. There is a difference between OE and aftermarket. find the specs to file the slide from stock 2.5 to 3.0. I lost all that info when my old laptop shit the bed. I think Eric Gorr can cut the head to run pump gas or you could run 100LL Avgas at 32:1 with any decent oil. I use Maxima SuperM. For the swingarm bearings and bushings, OEM is best but $$$$. Triple clamps from a 84 or 85 will put the bars over the fork tubes for a more modern feel. You jsut need to use your 81 steering stem.Uni still has air filters available and the chain rollers are still a dealer item as are the swingarm blocks. The rollers are the same as whats on the Banshee. I found some pegs from a late model YZ/YZF that with a little grinding and drilling the peg mounts work just fine. Mine were ti so I have that trick factor going. There is on Ebay some where a milled bit for the clutch arm that will help soften the clutch pull. Look for a shift drum on Ebay as they are kind of fragile. I split and replace now in 20 minutes once I get the bottom end out of the frame. You can still get a V-force reed block for it. Add that with a PFR pipe and silencer and it will be really crisp. I run a hardened bolt in place of the shock/swingarm clevis pin. The stock one can bend. Do lots of digging on Ebay for small parts. Wiseco pistons are fine, just make sure you have a good machinist to set it up for you.
GIwasB4
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GIwasB4 2/11/2018 9:18am
2/11/2018 9:18am
wfoskir wrote:
I have an 81 YZ250 frame, I will sell. Do you have any other after market YZ goodies you would sell? Anything for 1980 YZ125?
I got the frame covered with the confirmation of the 250 swap. Thank you tho.
The 125G is actually my achilles heal. I have too much, nah that's not possible. I do have an nos cone pipe I'll sell you.






MXDAD140
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MXDAD140 2/11/2018 2:59pm
2/11/2018 2:59pm
Now it’s apart. Time to get some parts ordered.











wfoskir
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wfoskir 2/12/2018 7:00am
2/12/2018 7:00am
Looks like you need donor frame. I have parts from a 1981 YZ250. I think some parts swap over.
450exc115
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450exc115 2/12/2018 8:30am
2/12/2018 8:30am
I could use the rear fender hoop if anyone has a junk frame but the seat mounts all the way back are good. Smile
MXDAD140
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MXDAD140 4/25/2018 12:47pm
4/25/2018 12:47pm
Getting there. Waiting on the wheels and forks to get done.
MaxPower
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MaxPower 4/25/2018 1:15pm
4/25/2018 1:15pm
Lol ,of all the bikes you chose to get with an artificial hip you picked a yz465. The only thing worse would have been a 84 CR500
MXDAD140
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MXDAD140 4/25/2018 1:53pm
4/25/2018 1:53pm
MaxPower wrote:
Lol ,of all the bikes you chose to get with an artificial hip you picked a yz465. The only thing worse would have been a 84...
Lol ,of all the bikes you chose to get with an artificial hip you picked a yz465. The only thing worse would have been a 84 CR500
Just had to have it. lol

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wfopete
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wfopete 4/29/2018 7:43am
4/29/2018 7:43am
MXDAD140 wrote:
Getting there. Waiting on the wheels and forks to get done.[img]https://p.vitalmx.com/photos/forums/2018/04/25/257585/s1200_13E47F31_3686_4E46_9E90_F3798868B8DA.jpg[/img]
Getting there. Waiting on the wheels and forks to get done.
While you are waiting on your wheels; clean up your #*^!&$ garage!
Achahoish 4/29/2018 9:14am
4/29/2018 9:14am
MXDAD140 wrote:
Now it’s apart. Time to get some parts ordered.[img]https://p.vitalmx.com/photos/forums/2018/02/11/243450/s1200_C3678600_6BD1_4BE4_A48D_94F3A4DCFD5A.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2018/02/11/243451/s1200_33C0CC1D_4886_476B_ABED_F57E31F2144C.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2018/02/11/243452/s1200_B844B295_5576_44EF_93B3_37D590AB805F.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2018/02/11/243453/s1200_E7CE0516_66A8_4CEF_8B0C_F7A3414E5F6E.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2018/02/11/243455/s1200_98E2CADF_9B0F_451C_8BE3_CC98CEDE30D9.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2018/02/11/243457/s1200_C681943E_7979_410F_9BCA_12DC092FE9F3.jpg[/img]
Now it’s apart. Time to get some parts ordered.











Seriously dude; get some parts trays, or steal a couple of the wife's roasting trays. You are going to ,lose nuts & washers & bits.
Or you will drop down onto your kness & kneel on one of those little SOBs

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