Building a 1981 Yamaha YZ465 Factory Replica...

[athomerecords25]

Originally Posted by anotherguy

So....uhm.........no portmap?

I would like to see this also, not that the porting would fit me or my riding level (I think Eric Gorr is the best at porting YZ400, YX465 and YZ490 Cylinders). I don't think he would have the equipment to be able to provide a Port Map or Cylinder Port Scan, and taking it to an Engineering Facility to have it done would cost a small fortune.

[anotherguy]

All it takes to produce a portmap is some time,pencil,scotch tape and paper.

[athomerecords25]

FJ_Kevin,

Could you please post up a picture of the Clutch Hub Nut from your 1981 Yamaha YZ465? Thank You in advance?

Edit: scratch that I found a pic online. I have the right nut and washer (thought I had lost them and was trying to put on the wrong one). For some reason the Shaft isn't sticking out through the clutch hub, it is way too short, it was fine before I took the clutch off. I did something wrong. Oh well back at it tomorrow.

[FJ_Kevin]

Well I cant believe it has been a month and a half since I last posted anything here.

Aside from the usual life events, I have been real busy trying to get things ready for the upcoming season. It's easy to spend all the time working on projects without leaving any to report on the progress.

But wow! I can see I really need to address that huge whooper of a story I told about the OW41 cylinder in my last post!

Haha, yup, that was a total fabrication on my part originally put together as a gag to one of my old racing buddies to get him interested in joining me in some vintage MX this year. It worked so well on him that I just couldn't resist having a little fun with my friends here !

So here's the real story.

That OW cylinder is really just an ordinary IT465 cylinder for a second yz465 I am building (and one that my buddy might ride). You can tell this as it has the rubber noise isolators in the fins.

To help make this caper fly, I purposely kept the image of the cylinder in the oven small in the previous post hoping no one would notice this . I knew with a large image someone here would have thrown the BS flag on me!



As for the "special OW" cylinder stampings,



I simply ground the original casting marks off and then did a little finishing with a hand file. After that it was just a matter of searching the shop for my old stamps (see below).





My original intent was to stamp Hannah on the cylinder but I was missing the letter "H". So that's when I got the idea to look in the book to see who else could have been riding YZ465's at the time. That's when I spotted Rex Statens name on the very same page as a photo of the factory OW, what could be better?

The reason I stamped "R X instead of "REX" was because I was also missing the letter "E" .

In any case, I hope my BS story hasn't offended anyone and besides half the fun of vintage MX is the BS that goes along with it all!

And if I did offend someone, then you will be very pleased to know that I am sore as hell today after falling off the 465 yesterday at Budds Creek while racing in the post vintage 50+ class... more about that later !

So now that I have confessed and while still on the topic of fakes, forgeries and fish stories, here are a couple of more.

First is an update on my fake Bell Motostar (really a $100 snell 2010 HTC ) helmet I posted earlier. Here it is again after adding the Bell stickers and as it sits next to my old Moto 5 on left.




And then there is this ebay listing for a factory Suzuki Motocross bike (dont worry, not mine!). This has generated a lot of commentary on the usual vmx web sites. Earlier listings had a BIN price of $250K... seems about as fishy as my story :-)

SUZUKI RH 250 HISTORIC VINTAGE WORKS FACTORY MOTOCROSS
http://cgi.ebay.com/ebaymotors/SUZUK...exp=true#v4-39



If the Suzuki factory bike is too much for you then consider Rodger Decosters expansion chamber for just $3000 here...

http://www.ebay.com/itm/Suzuki-RN72-...dc9871&vxp=mtr



A fishy photo from the past?




Next up... the YZ465 and old guy head to Budds Creek for vmx racing



Uh oh !

[anotherguy]

I kinda feel like old Flounder.

“Flounder, you can’t spend your whole life worrying about your mistakes! You fucked up… you trusted us!”

[wfopete]

Originally Posted by FJ_Kevin

A fishy photo from the past?

Really Kevin, April 1st is only a few days away. You should have waited until then.

I don't know about the rest of the photos but #22 is Magoo showing the AMA that he could ride a track "backwards".

The 465's in the truck and the Budds Creek are more fakes no doubt; carefully photoshopped.

[Mr. Carts]

I just picked up a IT465 and have a oil question.

What oil are you using with for your 40 to 1 premix?

My IT465 manual says Yamaha R at 16 to 1.

Thanks

[FJ_Kevin]

Originally Posted by anotherguy

I kinda feel like old Flounder.

Hey,no way!

I know well seasoned, grizzled veteran when I see one (yeah, I've read your posts!).

I will soon be starting on a Moto Bitsa composed of a collection of left over husky, maico, ktm, kawasaki and yamaha parts and will be needing some sage advise to make it work so please stick around!

Of course, it will have some kind of yz/it490 motor in it.

Here are a couple of teaser photos. First one is gathering up possible parts to use (thats a maico tank on there).



Here is another mock up with ktm swing arm, husky tank and some yz forks.




Plenty to figure out but it should be fun.

Here is another bitsa found on the web. This seems to have a husky frame too.

[FJ_Kevin]

Originally Posted by wfopete

The 465's in the truck and the Budds Creek are more fakes no doubt; carefully photoshopped.

I really do deserve that, ouch!

BTW, I made a new observation relating to the kick starter gear issue. The problem turned up on the 2nd YZ I have been working on and relates to the tang on the gripper spring on the kick gear. A problem here caused the kick gear to engage when the motor rotates backward (like in kick back).

It's easy to miss, will post some photos with the details.

[FJ_Kevin]

Originally Posted by Mr. Carts

I just picked up a IT465 and have a oil question.

What oil are you using with for your 40 to 1 premix?

My IT465 manual says Yamaha R at 16 to 1.

Thanks

I seem to be doing fine running Amsoil Dominator mixed 40:1 and sometime 50:1 .

The shop down the street from me has it so I mainly use it out of convenience.

I'll let the others chime in with their opinions.

[anotherguy]

My 465 has survived a long time w/BelRay H1R @32:1 in leaded and oxygenated race fuel. Second owner and second oversize piston. Crank's number 2 only because I wanted to balance it. #1 had plenty of life in it when I took it apart.

[FJ_Kevin]

They had a pretty good turn out at Budds Creek and I was fortunate to find a bit of time to stroll the pit area and take some pictures.

I'll start off with the euro bikes.

This KTM 420 caught my eye right away. It looked well cared for.







A couple of CZ's also showed up.





There were a good number of maicos, here is one of them.



There were two of these neat little ducati dirt bikes at the same trailer. Too bad I did not get to see them run.



And a Benelli!

[D.T.]

That looks so cool. Man I need to find some vintage MX races this summer.

[FJ_Kevin]

Of course there were plenty of japanese mx bikes too, including many alloy tanked Suzuki RM's











This red framed honda looked pretty tricked out,





CR250



More air cooled Honda's, single and twin shockers.



1979? YZ250

[FJ_Kevin]

Originally Posted by D.T.

That looks so cool. Man I need to find some vintage MX races this summer.

Yes, you should go. It was great fun!