Project: YZ250R

[TCI Performance]

I've been in process of building a 2-Stroke project bike over the last few weeks. I originally wanted to start this a couple of years ago but due to work I just now finally pulled the trigger.

I am currently past the half way point and in the middle of manufacturing custom parts at this point. The initial engineering, FEA and function checks have been completed and moving forward in putting all the pieces together.

I will be posting some pictures of different stages as I am moving towards the completion of the first build.

I hope you will all enjoy it.

The Victim

2006 YZ250 2-Stroke

The Objective

To update and make something that's good even better.

Updates will include the following:

* All new Aesthetics
* Engine Relocation
* Both Front and Rear Suspension Mods
* Chassis/Frame Modifications
* Upgraded Plastics
* New Graphics
* Loose 5-7lbs of original weight
* Engine Mods
* Newly designed sub frame
* Custom Exhaust System
* And more........to keep it interesting.

I will update with pictures and write up's as mentioned but It won't be on a daily basis rather a weekly kind of thing so please have patience as I don't work on it all day every day.

I know this is not too exciting yet but they all start off looking like this.

One thing I can promise is that when I'm done with her she will be one of a kind.

[Charles Owens]

Sounds like an interesting project, welcome to the site!

[citabjockey]

Fuel injection perhaps?   

Going to be watching this thread.

[TMKIWI]

Some interesting idea's.
" engine relocation" ? like to see how and why.
Will watch with interest.

[scotty dog]

Very interesting, looking forward to seein the finished product

[Jeram]

very nice.

question: if the engine relocation has to do with the counter shaft postion wouldnt it be simpler to modify the frame to accept an adjustable swing arm pivot height system that allows changes by swaping inserts, or an eccentric rotating system?

That way you dont have to guess where it needs to be for all scenarios, you can tune it to find the optimum position for each track

[cnrcpla]

Cool project  I can't wait to see the progress  If your moving the engine I think fuel injection would be a good option because it might fit better (depending on where the engine is going  )

[Logan Dewey]

sounds like fun

[factoryX]

Lower the engine and gas tank down to lower the center of gravity would by far be the most beneficial by making the bike feel even lighter. Lets take a step back in time and look at honda:
 

[Uniflow]

Are you planing to cut the frame?

[_X_]

relocate the engine to the back of the bike like a top fuel dragsta!

[citabjockey]

Lower the CG? swap the locations of the airbox and the gas tank

 

Lower the engine and gas tank down to lower the center of gravity would by far be the most beneficial by making the bike feel even lighter. Lets take a step back in time and look at honda:
 

[factoryX]

Yamaha Tri-Z style

[TCI Performance]

Thanks for showing all the interest in this build. I will try to answer most of the questions with one reply. However some of it I will not address in detail or at all at this point as I would like to keep it interesting and not give away too much.

* Fuel injection is on the list but most likely will not be released into the first build as I want to test the carburetor version first.
* The main and sub frame will and have been cut and modified to accept numerous changes for the pipe, engine, radiators and air box.
* Lower CG will be achieved with the changes mentioned above.

The bike has already been built back up with the mock up modifications in order to assure proper fit, form and function and I am now in process of manufacturing the actual pieces and other required parts in order to weld up the main and sub frame. After that has been done the frame will be properly processed and once I get the frame back it will go pretty quick to build it up as everything should just bolt on. Assuming everything goes by plan I should be able to release the first finished pictures by this month end with test rides and write up's to follow.

Can't wait for it to be done and share it with everyone.

[TMKIWI]

* The main and sub frame will and have been cut and modified to accept numerous changes for the pipe, engine, radiators and air box.

You turning the cylinder around , aren't you.