TZR250 w/ YPVS YSR build

Some of you may remember my other build from a while back. Lifan 150 in my YSR. Since then I have put around 6,000 miles on the small little beast with some long trips of more than 200 miles in a day and my average gas mileage was 85 MPG!!! I have since sold the 150cc Engine and picked up a larger engine.

I found the engine of my dreams. It is a twin cylinder, water cooled, 250cc, TZR250 engine with YPVS made by Yamaha. YPVS is a power valve that is controlled by the ECU and servo actuated. These engines are supposed to put out 50hp stock @ 10,000RPM. This is the same engine as the TDR250 if any of you know that bike. Although I have not started tearing into my Ysr quite yet I am currently re-building the engine. The engine came with carbs, manifolds, exhaust and ECU. Here are a few pics. There is something mechanically wrong with the engine, see if you can tell what it is in one of the pics... (its not the carb)

http://i99.photobucket.com/albums/l2...e/DSCF2136.jpg

http://i99.photobucket.com/albums/l2...e/DSCF2139.jpg

http://i99.photobucket.com/albums/l2...e/DSCF2153.jpg

http://i99.photobucket.com/albums/l2...e/DSCF2156.jpg

http://i99.photobucket.com/albums/l2...e/DSCF2158.jpg

this should give it away or you can cheat and hop to the other forum

http://i99.photobucket.com/albums/l2...e/DSCF2163.jpg

******PDATE**
The 150cc 4 stroke is coming out and being sold
The TZR cylinders are being sent to the machine shop for rod honing to .0001" out of round. New gasket kit is in, new OEM power valves are in, Everything seems to be coming together.
I have also picked up the raptor 660 Headlights to be used with the r1 body kit from ysr50.com. I want to run the curved tail piece but will have to run a plate and lights as well.

Has anyone found a way to mount the raptor lights so that they are adjustable into the ysr50 r1 street upper?

I am also looking at these Wheels:

http://www.mobsterpitbike.com/public...i/CIMG5058.JPG
http://www.mobsterpitbike.com/public...i/CIMG5066.JPG

Things should start picking up their pace now that my riding season is coming to an end! Check back often for more updates and pictures.

I was looking at my Build Page Realizing that it is quite bare so I thought I would share some of the parts I have been stocking up on.

Some new Pistons
These are 1MM Oversize and the engine can safely go to 2.5mm overbore.
http://i99.photobucket.com/albums/l2...R/DSCF2758.jpg


Raptor 660 Headlights for the YSR50 upper.
http://i99.photobucket.com/albums/l2...R/DSCF2759.jpg
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My Heads have been ported, I have not polished the exhaust yet.
http://i99.photobucket.com/albums/l2...R/DSCF2761.jpg


Koso Digital Speedometer W/ Electronic/analog 15,000RPM Tach.
Some of you may remember this being for sale a while ago. This thing is Awesome. For those of you who done know it records water temps as well as 2 other points of your choice. Works with fuel gauges has pit speed alert and shift lights.... Too much to list!
http://i99.photobucket.com/albums/l2...R/DSCF2769.jpg


Old Power Valve:
The original one looked like this when I took it out of the engine...
http://i99.photobucket.com/albums/l2...R/DSCF2754.jpg


New Power Valve.
I got 2 of these OEM Yamaha parts from Australia. Seems that Yamaha doesn't sell TZR parts in the states. Surprisingly shipping was reasonable for all new parts.
http://i99.photobucket.com/albums/l2...R/DSCF2755.jpg


Lots more parts not listed. Here are some of them. Not all of them are clean yet but Getting there slowly.
http://i99.photobucket.com/albums/l2...DSCF2772-1.jpg

I am sending the Cylinders off to the Machine shop on the 1st of the month to get Rod Honed. I have been slacking on that.
When I start assembly I will bust out the DSLR Camera so you can actually see in my barley lit room

Let me know what you think of the parts and the build.

WOW!!! This is a project I will be keeping an eye on, That thing is going to be scary fast!

Once the build gets farther along, I think this will be just right for a spot on our "Front Page"

Keep up the GOOD work.

Nick.

Awesome, sounds great to me. I have always said that I want a bike so fast that nobody else even wants to ride it. Hopefully this is it because I am runnign out of Motor options

Thats gonna be insane.But please tell your gonna do some better brakes and some decent suspension mods.To go along with that beasty package.

I have a few plans for the future suspension modifications on the bike. With my 150cc motor I was already scared every time I tried to slow or stop the bike, especially when going downhill. (I live in the mountains)
I plan to convert some KX100, CR85 or YZ80 USD forks, shorten re-valve ect. Brakes will be upgraded rotor(s) Brembo calipers and Master cylinders, mostly because I like the gold look. I would love to find an Ohlins rear shock from a 600cc bike and run it with a linkage but I don't know if there will be space with the way I am routing my pipes.
Wheels are still up in the air, I like the ones above but they are not quite right with the look I'm going for. Open to suggestions. FYI I don't like the Douglas wheels. I am willing to spend about $500 on wheels to my door. I know that doesn’t leave many options but keep me in mind if you come across anything special.

Hope this clears some things up.

dang bro, with everything your talking of doing, it would be easier and cheaper to pick up a nsr roller and start with that.

Wheels, brakes, susp. and all that will be much more avalible for nsr frames than the ysr.

Well it seems like this is something he wants to do.This is what it's all custom.

Glad see hear you got it all planned out. This should be one fun ride.I'll definitly be lookin forward to following your build. Excellent!

Well when it comes right down to it I will be going overkill for an NSR or NSF as well.
Several reason why I am keeping the YSR:
1. The parts I am upgrading to are made for full sized bikes. Thy wont work on an NSR or NSF anyways.
2. I want my bike to be street legal. My YSR already has current plates in California (where I live).
3. I already own the YSR.
4. I already know the engine and exhaust will fit in my YSR (you guys will see pics soon enough)

I want to make this bike as factory looking, stable and vibration free as possible. I know that I could just go get a newer bike to start with but for my plans I would have to tear the roller down and cut everything up the same amount that I will have to do with my YSR
When you are replacing the wheels, suspension, brakes, fairings, engine, exhaust, swing-arm and triple clamps, and modifying everything else, few will care about the make of the frame.

Not Trying to say that the NSR or NSF are not good bikes or that the YSR has more upgrades. I am saying that I will be building something way above the Midbike normal spec.
-Tim

A small update. I have cleaned up the old mounts and leftover welds from my last swap. I am cutting out frame gussets from 1/16" steel and with the help of some engineering friends strategically placing them in high stress points such as around the swing arm and headstock.

Also the new front forks have come in and I am in the process of mating the new triple tree to my headstock. New front forks are CR85 forks with a 45mm Top Clamp Diameter. These things are nice and strong! More updates and pictures to come, there just isn't much to see right now.