85 tri z with newer yz250 engine. What will it take?

[86tri-zrider]

The forums have been pretty slow for a while but there is a lot of guys here who've done similar projects on the Tri Z'z:

http://www.3wheelerworld.com/showthr...ower+valve+tri

Try different Z searches there's lots of pics & info on this site.

Yes, there is alot of projects on here that ive seen, but mostly all guys running the 83-87 yz engine or doing thepowervalve mod from the same engine, i cannot find anything anywhere on any site of anybody using a newer yz engine. Ive been a member on this site for 5+ years but have just never really posted anything untill now, ive spent alot of time on here just reading, and havnt ever seen it done.

[Red Rider]

Nor have I. If it's been done, whoever did it, kept it quiet. Someone needs to be the first, so why not you?

[onformula1]

I like this build a lot, I was talking to a few guys on this board including John Neary about this set-up and no one disliked it, it has been on my to do list for about 5 years.

This thing will be very fast, but if you want to go to a big bore you will be limited to 265cc or 295cc because on the power valve, Eric Gorr makes a great kit.

You can also go with a new cylinder and head from ESR that uses a different power valve set-up, they make a 325cc & 345cc kit.

Here are some links if you are interested-

http://www.eric-gorr.com/index.php/s.../big-bore-250s

http://www.eddie-sanders-racing.com/...g-bore-kit.htm

http://www.eddie-sanders-racing.com/...g-bore-kit.htm

I would prefer to run the stock cylinder & head modified for a big bore even if it has less displacement.

[86tri-zrider]

If you decide not to go with a yz engine, Klemm Research offers a 350cc Tri Z kit. Raffa is the only one I know who has got one running but he does not post here anymore. There's vids on YouTube with his 350Z, I think the kit us north of 1k and requires case mods.

http://trikeracing.com/discussion/6/...-raw-meat-2/p1


More yz specific info:

http://www.3wheelerworld.com/archive...hp/t-7015.html
http://www.3wheelerworld.com/archive...p/t-58910.html

That is pretty interesting i hadnt seen that before. My only issue is i do not have any stock tri z engine parts to start with. All i had is the bottom end and sadly its all scrap do to the fact it sat outside for 20 years with the topend removed. So thats why ive come to wanting the newer yz engine. In my mind its the best option starting with more or less nothing. And at the end of the day ill have an engine that parts are more readily available for and also an engine that there is all sorts of aftermarket support for (cough,bigbore kits,cough,cough)

[onformula1]

Nor have I. If it's been done, whoever did it, kept it quiet. Someone needs to be the first, so why not you?

Listen to this guy, he has the badest 250r engine ever! (IMHO) Which sometimes moonlights as a CR250R

[jonolanracin]

I am in the process of putting an 01 yz250 in a triz and the only issue i found yet is that the engine will sit right in between swingarm fine but the front sprocket doesnt line up so im going to cut 3 16ths off swinger to slide engine over up then make a spacer

[86tri-zrider]

I am in the process of putting an 01 yz250 in a triz and the only issue i found yet is that the engine will sit right in between swingarm fine but the front sprocket doesnt line up so im going to cut 3 16ths off swinger to slide engine over up then make a spacer

So do you have a thread somewhere going on this build? Id like to see pics of it and whatnot. I figured some modification would be needed in that area, and whether the material came off the swinger or the engine i didnt know which would be better. Ive had a horrible time of just trying to pick up one of the 3 donor bikes ive found for this project, idk if its just dirtbike people or what lol but everytime i suggest me coming to look/ buy the things all three of these guys just like quit answering me for a day or two. I dont get it, if your selling something you should be trying to make yourself available to get rid of it, not the other way around. So as soon as i get my hands on an engine i will be starting the process of getting it mocked up in the frame so i can get the frame off to powdercoat afterwards. Im hoping to have this project completed or close too it by spring time

[jonolanracin]

I havnt started a thread im trying to finish the restoration on my 86 tecate and dont have time to post much but i am going to cut the swingarm to get it set ill be sure to send you a pic when i get to

[86tri-zrider]

Well heres the donor bike, finally was able to pick one of the 3 i was looking at up today, its an 03 got the whole thing along with a load of parts and aftermarket stuff i will probly never use for 500 bucks. It needs a piston and rings, bottom end is solid. Just pulled it off the truck probly 3 hours ago and already got the motor out sitting on the floor next to it. Hopefully whenever i get back in town from work ill start to get it mocked up in the tri z frame.

[onformula1]

Well heres the donor bike, finally was able to pick one of the 3 i was looking at up today, its an 03 got the whole thing along with a load of parts and aftermarket stuff i will probly never use for 500 bucks. It needs a piston and rings, bottom end is solid. Just pulled it off the truck probly 3 hours ago and already got the motor out sitting on the floor next to it. Hopefully whenever i get back in town from work ill start to get it mocked up in the tri z frame.

You got a great deal, the rest parted out will easily get you your investment back if you go down that road.

[86tri-zrider]

The yz motor and triz case side by side on the garage floor, first things noticed are that the front case mount on the yz is a little wider than the tri z mount. Shouldnt be too big of a deal though as the way the triz motor bolts up in the front it uses plates that bolt to the motor on one end and to the fram on the other, should be able to make a set of stepped plates so i can use the stock front mount. As for the rear mount it is the same width and slides in the swingarm, but as previously stated on this thread by another member the front sprocket doesnt quite fall inline where it needs to be. It isnt off by much though, im hoping maybe the distance can be acheived possibly by just shimming the sprockets somehow, if not the swingarm will have to be shaved. I havnt actually set the engine in the frame yet to see where the bottom mount will fall.

[86tri-zrider]

Set the motor in the frame yesterday and started figuring out what needs to be done, also made up the bottom mid mounts and welded in place. Not the prettiest right now but ill get them cleaned up and itll look almost factory under some powdercoat. heres a few pics

[86tri-zrider]

Some more pics of progress. I got the engine all bolted down, made some custom mounts for the front and used the stock ones along with them, so far it looks like the stock radiators and where they mount will work with no issues. With the design of the newer engine the cylinder stands up straighter and creates quite a bit more room between the engine and the radiators

[3 Wheel Drive]

The 3ww shop used to sell beefed up foot peg mounts for the tri z. This might be a good time to look into it before you paint your frame. Some pics of the install: http://www.3wheelerworld.com/album.p...id=2336&page=2

This is not quite the same as your build but it's a newer yz trike build: http://www.3wheelerworld.com/showthr...ghlight=Yz+450

[86tri-zrider]

The 3ww shop used to sell beefed up foot peg mounts for the tri z. This might be a good time to look into it before you paint your frame. Some pics of the install: http://www.3wheelerworld.com/album.p...id=2336&page=2

This is not quite the same as your build but it's a newer yz trike build: http://www.3wheelerworld.com/showthr...ghlight=Yz+450

Man that newer yz build is pretty sick, i hadnt come across that here yet, thanks for the link, i might have to look into trying something like that when i finish this one. But yes i agree id like to do the foot peg mounts also, but the shop doesnt sell them anymore that i could see, ive tryed to get in touch with raffa with no luck yet, as i heard he had been making them. I guess worse come to worse i could just make a set?