tri-z / yz interchange parts

**hrc85250r** · 10-23-2006, 09:25 PM

what years yz motors and which parts are swappable with the tri-z? i have a friend with a tri-z he blew up bad and just checking on cranks and whatnot from a yz will fit....thanks guys...

**team-red-rider** · 10-23-2006, 09:31 PM

i say swap a yz490 motor into it LOL

**maggiesboy** · 10-23-2006, 09:41 PM

cases and clutch are the same....
piston...

not sure what else

**Bryan Raffa** · 10-23-2006, 10:06 PM

internals of the motors are the same but the left case is diffrent due to the diffrent style stator and cover..right side would be the kick start gears and added powervalve controlls in the right side.Top ends are power valved..Stick with the 85-86 motors and you'll be all set.

**Mosh** · 10-23-2006, 10:10 PM

actually,the cases from the 85-86 yz 250 are identical to the tri- zcases. it is the left side crank journal that has to be changed to accept the tri-z stator.my tri-z is running 86 yz cases with the tri-z kicker gears clutch cover and left side crank journal form the tri-z.

**Bryan Raffa** · 10-23-2006, 10:14 PM

thanks for clearing that up mosh!!

**hrc85250r** · 10-24-2006, 12:32 AM

so the cranks, rod and whole top end minus the whole pv deal are the same?

**OZQUAD44** · 10-24-2006, 07:06 AM

Can you just throw a YZ donk in there and run no lights?

**Mosh** · 10-24-2006, 07:13 AM

the right half of the cranks are the same.if you want to run the tri-z stator,and keep your lights,you have to either drop in a tri-z crank,or swap the left crank journals from yz to tri-z.the taper on the left of the yz crank is different,than the tri-z and wont hold the tri-z flywheel.the tri-z flywheel is bigger than the yz flywheel.the rods are the same.every thing else in the lower end is identical is far as i know.i went thru this with mine.if you wanted to,you can just run the yz bottom end and crank and stator,but you wont have lights and you may need to splice the yz stator to the tri-z cdi box.the yz top end is somewhat different.i think it uses a different head gasket and the intake is bigger and a 6 bolt reed design and offsets to the side a little. but you can take out the power valve actuator in the yz bottom end and bolt a tri-z top end right on the yz bottom end.

**OZQUAD44** · 10-24-2006, 07:18 AM

I know that in Australia some companies offer a kit so you can fit a lighting system to an MX bike.

I'm not sure how much these kits run into $$$?, but it may be easier, just to put an aftermarket coil system into a YZ motor than it would be to swap crank journals and cases across different engines.

Did you look into this Moshman355?

**Mosh** · 10-24-2006, 06:59 PM

i did not look into the aftermarket lighting coil.In most cases those things run around 75 bucks or more.I had a bad tri-z rod and crank and a basically brand new yz crank in the yz engine.so i just swapped the good yz rod, to the tri-z crank for 50 bucks and dropped it back in the yz cases and installed the tri-z stator and flywheel.it has been running fine for almost a year now.since i never heard the motor run that i had,i split it down just to check everything out,so it really wasnt out of my way to do the swap.

**TRI-Zbrian** · 10-24-2006, 07:18 PM

hey there this is brian... lol i herd jay blew his tri z up after spending 2 grand on it... any way dude if i were you... keep the tri z bottom end and get it rebuilt from what i saw that night he showed it to me he shouldnt of hurt anything bottom end wise any way... but being that engine as all stock... just get a crank rebuild kit... wiseco sells them and also hot rod cranks has them for like 80-100 bux... tell jay to not be cheap.... im trying to talk him into just rebuilding it all bottom to top weather it looks like it needs it or not and get the yamaha wrench report mods done to it...
when i get on my feet a bit i plan to get an 86 so i have the 6 speed.. im going to do one up white and red... i have had yellow and black and all black so id like to have on white and red for ounce... lol any way telljay i said hi... and you guys plan to be riding with me some time soon...
im actually writing this to you in rahab right now they got computers put in... so its not so bad...i had to stop my drinking problem so i am here... any way i wish you guys luck and dont let jay ruin that tri z... lol i think its funny i made a believer out of him he never even new what a tri z was till i left mine at his house while i was in school for him to mess around on.... i love the tri-z .... any way if you guys come accross a semi complete one def let me no... i am going to build a rideable up hill drag bike... but im not going to go to the extent that it cant be ridden normal...
any way ill see you guys when i get out... also if you need parts i know of a guy i bought my second tri z off of in a 518 area code that suposedly has a *Edited**Edited**Edited**Edited* load of parts but im not ready to give that number out till i give him a call first.. lol...any way party on with the tri z.. and it sux it blew up on him... but what the helll the engine was all ariganal.. it was bound to happen eventually.... im betting that pipe thats on there ... when they through it on they never jetted it and it was running a tad bit lean...also i think he should get rid of the stock car and go with a 38 flat side along with the wrench report mods and soem new reeds and it will be a screamer... lol but you can tell him no matter what he does ill have an 86 thats faster... lol any way i gotta get going.....
and for the rest of you guys yes yes... im in rehab ive had some hard time the last 2 years with alcahol... im righting this in rehab as we speak... ill prolly be here a month as soon as i get out i plan to get a tri z and build something bad ass with it... im going to go all out this time...

**TRI-Zbrian** · 10-24-2006, 07:26 PM

also i might add.. if he wants a quick revver he can swap for a tri zinger fly wheel and stator... you wont have lights but the lighter fly wheel will let it rev up real quick... another little hint that i shouldt give yah lol.... also with mine i plan to you the tri zinger tank and get rid of the feul pump and under seat gas tank all together ... you put the zinger tank under the air box lid and get rid of the air box and use a clamp on air filter... lol i should shut up now... any way im here if you need me dude i have researched a crap load about the tri z so i know a great deal of little tricks with them...

also if you do a search for my name i have a like 4 page long thread about what parts from othe rbikes will inter change with the tri z... things like reeds from newer yz 125 bikes will fit the tri z ... do a search for that sight it will help alot...

**ceaserthethird** · 10-24-2006, 08:01 PM

Drink's on me * Tri-Z brian * as soon as you get out

- J/K

Post Up - keep us posted on damage

**TRI-Zbrian** · 10-24-2006, 10:49 PM

yeah the night before i left for rehab.. he came to show me the bike.. he said it was locked solid and hadnt touched it all day.. i got up in the truck and it kiked over and wanted to start.. i think he just locked it up and it unlocked id bet all it would need is a frsh bore job and he would be set but with an engine all ariganal.. id go through it and rebuild the bottom end while i was at it ... and make sure when they through that pipe on there they didnt just bolt it up and leave it at that .. make sure it not running lean... but jay knows that.... lol i cant wate till im rolling with you guys again.... and lol about the drining maybe sometime way way down the road for now i have to consentrate on just getting my life stratend around lol...pick up on my old lost hobby again and build another tri z ... lol any way things are going good here also... its a real nice place lol but i still cant wate to get to leave it and work again ...but for now i have to deal with it i guess...

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tri-z / yz interchange parts