2001 YZ engine in Tri Z....check out pics

[Darius1502]

I know you probably thought the motor was in the trike...but look how close the mounting holes appear to be. Can someone measure the mounting holes placement on the respective engines. I may get to do it this week...but if anyone has a Tri Z and a YZ....let me know:

This is a project with serious potental. There are also big bore kits of up to 300 cc 's for the modern YZ that could make it a 50 hp motor.

The only issue I see is with the pipe and maybe the airbox and carb. Obviously you would fabricate some airbox set up and get rid of the Tri Z high breather system.

[Darius1502]

Also since the kickstarter will kick backwards the rear fenders will have to be taken off to start it. A set up where the seat and rear fenders are bolted together (like the ATC 250R) would be best here.

Vibration may be an issue since I think Tri Z motor has a counterbalancer....but I could be wrong.

Also a hole will have to be drilled in the bottom of the cylnder for the fuel pump to create a vacum. But thats not a big deal.

Lastly, if I want lighting I need to get the coil from a WR250.

What else might I be missing?

[CHAINSAW]

they look very close. How does the hole on the bottom of the motor line up?
As for the head stay, I wouldnt really worry about it. My 85 with a YZ doesnt have the headstay bolted, and I think that machine has less vibration then a regular Tri Z.

[Darius1502]

I don't know. If you look at the frames it looks close. The bottom brackets could be re-welded into place.

It looks pretty darn close but someone needs to do some measuring.

[CHAINSAW]

Also since the kickstarter will kick backwards the rear fenders will have to be taken off to start it. A set up where the seat and rear fenders are bolted together (like the ATC 250R) would be best here.

Vibration may be an issue since I think Tri Z motor has a counterbalancer....but I could be wrong.

Also a hole will have to be drilled in the bottom of the cylnder for the fuel pump to create a vacum. But thats not a big deal.

Lastly, if I want lighting I need to get the coil from a WR250.

What else might I be missing?

Zs dont have counterbalancers either.. the only downfall of them I see. If they rode as smooth as a 250R, Im sure we would see double the amount of tri Zs we do.

[XFR_Dozer]

a head stay would be ez to have fabricated. tri-zs do indeed have a counter balancer . they have 1/2 of yz crank and 1/2 all their own. (i learned that today lol) the pipe may be a prob. it has to be mounted correctly for the pipe. the carb and airbox are not a prob. you toss the old airbox and straighten up that carb with a special reed spacer

[smokinp]

That would be sweet if it would fit.

[CHAINSAW]

a head stay would be ez to have fabricated. tri-zs do indeed have a counter balancer . they have 1/2 of yz crank and 1/2 all their own. (i learned that today lol) the pipe may be a prob. it has to be mounted correctly for the pipe. the carb and airbox are not a prob. you toss the old airbox and straighten up that carb with a special reed spacer

Then why do they vibrate so bad? 250Rs dont vibrate at all, but Zs wil knock your fillings loose!

[Darius1502]

hmm...I don't know...mine does not vibrate that much at all.

Anyway it looks like this project has some potential. If anyone has a YZ and a Tri Z shoot me some comparision measurements please!!!

[XFR_Dozer]

ok im not a mechanic either chainsaw but i spent the better part of today researching through yamahas parts files to find interchangeable parts for for the tri and yzs as well as the old 400s and 465s for possible solution to my long rod project. what i found was that 1/2of the tri-z crank is the same,part number and all , to a 84-87 yz 250. the other half is a number only for the z. i assume this is for a counter balancer but the possibility exists that i am wrong.btwthe wrist pins , thier bearings and the con rod for a Z is all the same as the 84-87 yz 250. im still on it and will let ya know if i find anything interesting. ooo darius,you can put the gears in for the Z kicker and leave your fenders on.

[Darius1502]

even with a 2001 or later motor??

How about some research expertise on my new potential project...XFR? Since you are now the official 'Mr. Tri-Z'!! *













NOTE: there was once a guy called Mr. ATC who was very knowledgable but was banned from the board.

[XFR_Dozer]

ill be happy to look at it for you as long as you promise to never ever call me mr.tri-z again. lol it was once said that a little knowledge was a dangerous thing ,and i am a very dangerous man. ive forgotton many of the techincal aspects of Zs over the years and am far behind what is available now. I do have some good notes on old stuff but most of it isnt made anymore . back in the old old days guys did some wild chit to hop up the atc 90s. history is repeating itself as we once again must create our own mods. this was always the trike communitys greatest strength ,and it looks like it hasnt changed.

[Darius1502]

You got it XFR....I am glad you are on this board!

Great point about trikers....its kinda like we are going back to the early days of the ATC 90's and the flat track oval races....

we have to keep our sport alive!

Darius

[TimSr]

In all the Z motors Ive had all the way down to cases in half and gears laying on the bench, I have yet to find a counterbalancer in one. Id never seen one before I got my 250R, so I as of 2000, I do know what they look like and how they work. A TriZ does not have one.

[XFR_Dozer]

do you know why the tri-z has 1 crank part number thats only for a Z and the other is the same as a yz? the conrod and everything is yz until the piston so for what reason did they not use the entire yz crank?