Tri-z PowerValve

[NeverLift]

Here is my current project.

85 tri-z cases
86 tri-z transmission
85 YZ250 crank shaft Hot Rods connecting rod & bearings
85 YZ250 Cylinder (ported & polished cylinder)
Sprock Head
Wiseco YZ250 piston 68.5mm
38mm Keihin PWK
Boyesen Power Reeds
LRD Pipe
Unknown silencer
Complete chassis All Balls bearings
2001 CR125 Forks
Works quadcross rear shock
Lonestar +2 axel
Metal Tech +3 Swingarm Banshee round carrier
Hall Performance Triple Tree's
2001 CR125 Forks
2001 CR125 Froks -6"
Billet Thermostat Eliminator
Unhinged ATV Foot Pegs
250R Front Hub
10" 250R Wheel
Hoosiers on All 3
Adjustable Rear Lowering Link
Top Mount Tank
Still need to mount the radiators, gas tank, foot pegs, rear brakes, chain and sprocket. Then I will be breaking it in and jetting it. I planed on polishing the whole motor but ran out of time. I am going to Badlands Off Road Park on the 13th-17th of this month.
This is as far as I got before I had to go out of town on business. I'll be back this weekend to finish.

[3 Wheel Drive]

Looking good, I like your air box set up! How are the power valve yz cylinders vs the Tri Z's?

[NeverLift]

I have never ridden this year YZ. Cylinder stud holes line up perfect, exhaust is the same angle and diameter, head is the same, the reeds/reed cage is much larger, the intake comes out at an angle so I had ordered some turbo intercooled piping so the intake doesn't touch the exhaust(but it's very close). The flywheel is also way smaller.

[Rigaman]

How are you gonna fit the seat?

[NeverLift]

I had to cut the plastic and remove a little foam from the bottom of the seat for the intake pipe to fit but I have a tall desert seat so it works just fine. Here is a picture with the seat and airbox cover on.

[NeverLift]

Got some time today to throw a wrench at her. Everything is together except for the fenders. I started it for the first time and heat cycled it 5 times. Took it for a short ride on the 3rd heat cycle I barley got on it not even 1/2 half throttle and she feels pretty snappy. Can't wait till tomorrow to ride it a bit I've only got about a 600 yard straight away at the house to ride on but that should be good for the first few 10 minute rides. If I have enough light after that I will put in a fresh plug and do a plug chop to get the jetting dialed in.

Here is a short clip of it running in the garage.

http://www.youtube.com/watch?v=EwtqC_6yLqQ

[C.J]

Holy sheet thats awesome!!!! I wonder if Klemm can 350 the YZ cylinder.... hehe ,,,, I Seriously dig it man!!!

[NeverLift]

I ordered a Dial-a-Jet from Thunder Products today. I've never used one but always wanted to try it so I pulled the trigger. I will be installing on Friday and will report my findings. I have ridden my trike a few 10 minute rides taking it easy seems to run good( I only have about 20 minutes of sunlight after work to ride it). This weekend I will on it after I install the dial-a-jet. Sunday-Wednesday I will be going down to Badlands offroad park in Attica, IN come on out if you can make it.

[Rigaman]

I had to cut the plastic and remove a little foam from the bottom of the seat for the intake pipe to fit but I have a tall desert seat so it works just fine. Here is a picture with the seat and airbox cover on.

Thats really cool man! I like everything you have done. I am very curious to hear how it rides. I have heard mixed things about these powervalve cylinders on tri-z's. This is something I have wanted to do since my first tri-z.

[C.J]

What pipe are you running on this beasty? I wonder how my Phase-5 would do with the powervalved cylinder. Or if it's be best to get a custom pipe made

[NeverLift]

I'm running an LRD pipe. I don't know if this is the best option but I love this pipe.

[NeverLift]

I have the Z running but not good it breaks in high RPM no matter what jetting I throw at it. I am rebuilding the fuel pump with OEM parts. I also thought that the issue maybe caused by the nipple that goes into the cylinder. When I ported the transfers I ground the end protruding into the transfer port flush with the inner cylinder wall. Do you think this could have an ill effect? I will replace it anyway I have plenty of junk cylinders I can borrow from. I might shelf this project till the snow melts I don't like trailering with all the salt on the roads.

Did a little walk around video of the Z (and the 400ex)yesterday. I know it's boring but I thought I'd share.
https://www.youtube.com/watch?v=kIDz...ature=youtu.be

[NeverLift]

Fuel pump is rebuilt and still lean. I have a 220 main in it now it is much better but the plug chop is a very light tan color. I just bought 222 up to 238 and that's the biggest I can find. Hopefully one of them does the trick. With the tri-z motor same carb I had a 178 main I never thought I would have to go up this much but it keeps pulling harder the bigger I go. Leaving for Little Sahara in just over a week!!!!!!!!!!!!!!!

[C.J]

Wow! Keep us updated for when you get the jetting dialed in.

How's your float level? Have you tried changing the needle out?

Get us another video when she's all squared away!!!!!

[El Camexican]

That just doesn’t seem right. I would suggest you check the float height as per above (could be low) and also the reeds. If your fuel pump is working properly and you have no air leaks I can’t imagine you should need that massive jet.

PS. Trike looks great!!!