Send to us your cylinder head!

Now we have service for install KFR big valve for your TW or TTR heads! 

Inspect all cylinder head part , big valve install, porting etc.


Let us know what your question, concern and we will try best service as we can! 




Contact  : furuhashiracing@yahoo.com 

Have you try motorcycle race ?

How about flat track race?



MID-AMERICA SPEEDWAY has race on October 6th.



Competitor ages: 5 ~ Over 70.
Machine: Single and twin motor. 2stroke 4stroke, almost everything.
Race Classes: 50cc PW class to open class.

They have lot's of classes on going at one night. Let them know what bike you have! They'll arrangement for your classes.



It is simple competition. We go round flat dirt oval, nothing difficult. But it is really hard to win. That's gonna make this racing world very deep.


What can I say about dirt track is just FUN TO RIDE. I never felt it's bored run around oval track. Because every laps never be the same.  


Street ride is fun. Yard ride is also. But once you've tried this race, it is the most exciting moment will start. 


You don't have to go fast from first try. You don't have to have professional tuner's race bike. Let's try to ride first. MID-AMERICA SPEEDWAY is best local track in Indianapolis.

You will see what is "no speed limit" meaning. And you can feel it once you've tried why we like this.

Come and see the race!

Behind story.

After installed KFR Ex.big valve. This motor has webcam high lift camshaft.

We checking valve clearance by clay just to make sure. 

Plenty of clearance. 

IN:0.0827" (2.1mm, right side of picture.)  

EX:0.114" (2.9mm, left side.)

----------------------------------------------------




When KFR designed this exhaust big valve, it had little story.


Idea was started from year of 2010. Koji had two triggers. One was he got his own TW. And another one was his friend Shinji Kazama who made North pole ridden by TW200 based bike. Koji met him again when he visited the US in summer time. It happened almost same time.

He rode bicycle that time from Indianapolis to Toronto, Canada. (And that ride ended at Sweden, Europe!! He is the challenger forever.)  

We had couple of condition. But most part is this,


"Higher performance and stay in reasonable."



So, valve material choice is stainless steel, and valve size goes just over 0.039"(1mm). 

This cylinder head has more space for exhaust side so we could go more larger. The larger valve size will be better if we going to get more horse power but we did not want to replace valve seat ring. Also light weight titanium valve will make good effect on high revolution but this solid material is aggressive to seat ring. Seat ring replace is very sensitive work and lot's of labor. Just replace the valve will be so much cheaper and easy work. 

This thought is same even national race class motor. Those engine builders changed from titanium valve to stainless steel big valve.
(*Over size valve is not allow on GNC singles class any more.)  


We decided design by this reason, for more durability and "total" running performance. 


KFR exhaust big valve can install only by seat cutting job.  We are welcome to service your cylinder head if you don't have any place to work on it. Just let us know.

 
Also we service WPC treatment to KFR valve and other engine parts with additional price. 


This motor has much more possibility so, of course we can make more horse power if you want but just don't forget one thing. It is TW.

Having coffee break with "special cylinder head" TW.

Contact mail to Koji : furuhashiracing"AT"yahoo.com

KFR first product release!

Exhaust big valve for Yamaha TW200, TT-R225-230.(*Picture front. Back side is yamaha's stock.) 

1.0mm larger than stock.

$32 per piece plus tax (Indiana residents only) and shipping.
Ships from Indianapolis, IN


*Limited quantity






"I would try to go if no one try that line." When Koji is riding on oval track, his thoughts go many ways and that is one of his thoughts.  


That racing mind created this exhaust big valve for Yamaha TW200, TTR225-230 and more models.



Recent top dirt track race machines are run by a really high performance motor from Japanese 450cc Motocross bike. Those motors are great for racing. But also make high running cost to keep up that performance level. 

Race bike will keep going up higher performance with cost. It means getting step far away from street bike and riders who want to try to start race.

We'd like to make more people enjoy the race and customize their own bike with reasonable cost.

Our answer is here. We are happy to introduce this big valve for Yamaha TW and TT-R engine that two valve SOHC designed motor.


"Race bike for race, race for race bike." That is OK, pure racing model exists already. TT-R or TW are not for that purpose but very good model for beginning level low budget racer and mechanic. Koji decided to produce this part because of that reason. And, he started to have interest to how "his donkey" can go faster. (maybe that is his main reason!)

It gives you more exciting high revolution power with other tuning combination. 

We are happy to share this product for your bike and make your imagination a success! 




Notice: It is built for high performance racing engines. Because of potential abuse, no warranty is offered.



*Other model fits by Yamaha OEM parts number 5H0-12121-00(or 01)-00

TW200 All year models.

1983 YTM200EK VALVE
1983 YTM200K VALVE
1983 YTM225DXK VALVE
1984 TRI-MOTO - YTM200L VALVE
1984 TRI-MOTO 225DX - YTM225DXL VALVE
1984 YAMAHAHAULER - YTM200EL VALVE
1985 MOTO-4 - YFM200N VALVE
1985 TRI-MOTO - YTM200ERN VALVE
1985 TRI-MOTO - YTM200N VALVE
1985 TRI-MOTO - YTM225DRN VALVE
1985 TRI-MOTO - YTM225DXN VALVE
1986 MOTO-4 - YFM200DXS VALVE
1986 MOTO-4 - YFM225S VALVE
1986 TRI-MOTO 4-STROKE - YTM225DRS VALVE
1987 MOTO-4 - YFM200DXT VALVE
1987 MOTO-4 - YFM225T VALVE
1988 MOTO-4 - YFM200DXU VALVE
1989 MOTO-4 - YFM200DXW VALVE
1989 MOTO-4 - YFM250W VALVE
1989 PRO HAULER 1889 PRO-4 - YFU1W VALVE
1989 PRO-4 PRO HAULER W-TURF TIRES - YFU1TW VALVE
1990 MOTO-4 - YFM250A VALVE
1991 MOTO-4 - YFM250B VALVE
1992 TIMBERWOLF 2WD - YFB250D VALVE
1992 YFB250D_MN VALVE
1993 TIMBERWOLF 2WD - YFB250E VALVE
1993 YFB250E_MN VALVE
1994 TIMBERWOLF 2WD - YFB250F VALVE
1994 TIMBERWOLF 4WD - YFB250FWF VALVE
1994 YFB250FWF_ VALVE
1994 YFB250FWF_MNH (ME & NH Only) VALVE
1995 TIMBERWOLF 2WD (ME & NH Only) - YFB250FWG_MNH VALVE
1995 TIMBERWOLF 2WD - YFB250FWG VALVE
1995 TIMBERWOLF 2WD - YFB250FWG_ VALVE
1995 TIMBERWOLF 2WD - YFB250G VALVE
1995 YFB250G_MNH (ME & NH ONLY) VALVE
1996 TIMBERWOLF - YFB250H VALVE
1996 TIMBERWOLF 2WD - YFB250FWH VALVE
1996 TIMBERWOLF 2WD - YFB250UH VALVE
1996 YFB250FWH_ VALVE
1996 YFB250FWH_MNH (ME &NH Only) VALVE
1996 YFB250H_MNH VALVE
1996 YFB250UH_MNH VALVE
1997 TIMBERWOLF 2WD (ME & NH Only) - YFB250FWJ_MNH VALVE
1997 TIMBERWOLF 2WD - YFB250FWJ VALVE
1997 TIMBERWOLF 2WD - YFB250FWJ_ VALVE
1997 TIMBERWOLF 2WD - YFB250UJ VALVE
1997 YFB250UJ_M VALVE
1981 SR185H VALVE
1982 SR185J VALVE
1982 XT200J VALVE
1983 XT200K VALVE XT200K - KC
1985 BIG WHEEL - BW200N VALVE
1986 BIG WHEEL - BW200S VALVE
1986 BIG WHEEL ELEC START - BW200ES VALVE
1986 TT225S VALVE
1987 BIG WHEEL ELEC START - BW200ET VALVE
1987 TT225T VALVE
1988 BIG WHEEL ELEC START - BW200EU VALVE
1992 SEROW - XT225D VALVE
1992 SEROW - XT225DC VALVE
1993 SEROW - XT225E VALVE
1993 SEROW - XT225EC VALVE
1994 SEROW - XT225F VALVE
1994 SEROW - XT225FC VALVE
1995 SEROW - XT225G VALVE
1995 SEROW - XT225GC VALVE
1996 SEROW - XT225H VALVE
1996 SEROW - XT225HC VALVE
1997 SEROW - XT225J VALVE
1997 SEROW - XT225JC VALVE
1998 TIMBERWOLF - YFB250UK VALVE
1998 TIMBERWOLF 4WD - YFB250FWK VALVE
1998 YFM250UK VALVE
1999 BEAR TRACKER 2WD - YFM250XL VALVE
1999 BEAR TRACKER 2WD - YFM250XLC VALVE
1999 TIMBERWOLF 2WD - YFB250FWL VALVE
2000 BEAR TRACKER 2WD - YFM250XM VALVE
2000 BEAR TRACKER 2WD - YFM250XMC VALVE
2000 TIMBERWOLF 4WD - YFB250FWM VALVE
2001 BEAR TRACKER 2WD BEAR TRACKER REALTREE - YFM250XHN VALVE
2001 BEAR TRACKER 2WD BEAR TRACKER REALTREE - YFM250XN VALVE
2002 BEAR TRACKER REALTREE - YFM250XHP VALVE
2002 BEAR TRACKER REALTREE - YFM250XP VALVE
2003 BEAR TRACKER - YFM250XR VALVE
2004 BEARTRACKER - YFM25XS VALVE

1998 SEROW - XT225K VALVE
1998 SEROW - XT225KC VALVE
1999 OFF-ROAD (Deep Purplish Blue Solid E) (CA Ed.) - TTR225LC VALVE
1999 OFF-ROAD (Deep Purplish Blue Solid E) - TTR225L VALVE
1999 OFF-ROAD - TT225L VALVE
1999 OFF-ROAD - TT225LC VALVE
1999 SEROW - XT225L VALVE
1999 SEROW - XT225LC VALVE
2000 SEROW - XT225M VALVE
2000 SEROW - XT225MC VALVE
2001 TTR225 (Deep Purplish Blue Solid E) (CA Ed.) - TTR225NC VALVE
2001 TTR225 (Deep Purplish Blue Solid E) - TTR225N VALVE
2001 TTR225 - TT225RN VALVE
2001 TTR225 - TT225RNC VALVE
2001 XT225 - XT225N VALVE
2001 XT225 - XT225NC VALVE
2002 TTR225 - TTR225P VALVE
2002 TTR225 - TTR225PC VALVE
2002 XT225 - XT225P VALVE
2002 XT225 - XT225PC VALVE
2003 TTR225 - TTR225R VALVE
2003 TTR225 - TTR225RC VALVE
2003 XT225 - XT225R VALVE
2003 XT225 - XT225RC VALVE
2004 TT-R225 - TTR225S VALVE
2004 TT-R225 - TTR225SC VALVE
2004 XT225 - XT225S VALVE
2004 XT225 - XT225SC VALVE
2005 TT-R230 - TTR230T VALVE
2005 TT-R230 - TTR230TC VALVE

2005 XT225 - XT225T VALVE
2005 XT225 - XT225TC VALVE
2006 TT-R230 - TTR230V VALVE
2006 XT225 - XT225V VALVE
2006 XT225 - XT225VC VALVE
2007 TT-R230 - TTR230W VALVE
2007 XT225 - XT225W VALVE
2007 XT225 CA - XT225WC VALVE
2008 TTR230 (DEEP PURPLISH BLUE SOLID E) - TTR230X VALVE
2009 TTR230 (DEEP PURPLISH BLUE SOLID E) - TTR230Y VALVE
2011 TTR230 - TTR230A VALVE

Keep rolling.

We took off gear and starter motor. This bike is kick start only now. 
It makes over 2lb lighter easy.

This is another "tuning version" motor. It will be fun!

WPC Treatment.

Transmission after WPC treatment 

We never thought use this treatment to TW motor, but how interest is that if TW going run around on oval track with really good speed !? Let's see!

WPC treatment is metal surface treatment technology from Japan since 90’s. What we have interest are this treatment technology is very unique. (as Furuhashi Racing!) It would reduce friction and make more durability.

Please check out this movie.

Here is another WPC treatment effect movie.

We look forward about treatment will last longer than any other "coating" stuff. It  isn't make dimensional change so, WPC treatment can treat piston rings, nikasil cylinder and all .0005" or under accuracy part of motor. 

WPC Treated transmission shaft. 

We keep playing.. 

We wish you can touch this smooth surface feel.

Inside of motor technology is kind like a secret part in racing world usually. But race technology is feedback to automotive world, that's why racing exist for. We'd like to share some, and for your motor life going happy. Actually, WPC technology is into manufacture's production already. 

We feel good when motor runs well. Very simple thing from old days. WPC treatment would help that.  

Let us know if you have any question, or if you want to try WPC treatment. 

Contact information is here.

    

Motorcycle season is open!

It's been long time. Indiana having warm and hot days. 


We are keep in busy by so many thing but TW project is underway step by step slowly.

Right side end is OEM. 

These locker arms are ground by hand (power) tool for lighter weight. Weight difference is just about ounces lighter than stock. This work will not much increase HP numerically, but it's just like diet for human. It help runs lighter for motor if grind right away. Motorcycle manufacture make this parts very solid for street use purpose and that's right for them. However when we focusing more high performance, that will not perfect answer. Furuhashi racing will make best turning balance between these two factor that "durability and high performance" by purpose.




Next process is WPC treatment.










We'll keep push to the best. 

Parts clean up.

We have to wait parts arrive most in April.   

Motor is already split and we had a another work so, decide make little better looking clutch case cover.

  

Clean off paint and washed.

Put on some putty and sanding after dry.

Splayed surfacer.

Sanding and sanding..

After splayed black paint.

Things were never going through easy. When we waiting paint dry. Some bird was came and "bomb attacked" this cover. We did start over again these process. Second try wasn't better than first. 

Koji: [I love "YAKI-TORI" more than before.] 

Back in position after all. Picture shows lot of finger prints but it's looks better.

Electrical issue.

We found after all Electrical diagnosis that needs new coil.

This stator coil cost too much and back order "in Japan". We decided to replace all this old Electrical wires to latest model wire system. That wasn't cost difference much and faster we thought.


Then we found it has three kinds stator coil exit. And that mean three kind of crankcase cover and fly wheels.

Early model coil.

2nd & 3rd generation coil and cover. You can see these two has different mount wholes.

Three generation of Fly wheels.

 Left is oldest, right is latest. 

This is final shape before piece put back to body. 

TW was came out 1987. This one is '89. Yamaha changed only these Electrical system. Now, we can tell this motor is same as latest model!

All TW wire diagrams. Another fun time.

All wire harness switched newer. C.D.I  unit also new.

We doesn't change control switches so, many wire and coupler connection needs change like pictures. We will change control switch too if we have next chance. That saves lot's of time. 

Put back with new screw bolts.

What we changed: wire harness(used. came with relays & regulator), CDI, crankcase cover(used) and stator coil for after 2001~ model.

Carious tooth.

Keep split parts.

Simple is best.

74mm piston required crankcase bored out. We split crankcase and found these worn out gears. It just looks like carious tooth. 

Transmission gear

We know it is still work but decide to replace all gears (and bearings). More time and more cost, It was not expected but safety first. We don't want to see any mechanical trouble on the road, oval track or any other extreme place. 

These bolts were off from this motor. 

Right size tools and right maintenance would not make like these bolts. We service for you if you don't have time or tools.  (Contact information is on furuhashiracing.com )

 

Bearing fitting

We waiting all gears and bearings parts will arrive.

Motor work.

We working on yamaha air cooled 200cc motor.

It was a rough shape when we picked up. 




We decided to re-fresh motor for street and off road use. But Koji found this tire fits. Things going much more interest for dirt-track!

but first, bike has no spark. (We'll put on article for Electrical issue later.)




  The plan will going to stroke up and bored out from 196cc to 249cc. Also we make original big valve for this motor. It's sounds going to be like racing quality motor but reasonable cost is the key as this bike. We are plan to this tune will be service through from Furuhashi Racing to all motorcyclist. 


"Big valve motor makes good top end power. I have to see their tail when I race with those bikes. It is good tune up for motor performance side." Koji says. (*big valve is now prohibit on GNC singles class rules.) 




We going to change also High lift camshaft from webcam, valve spring and retainer. SOHC two valve air cooled motor means simple "friendly" motor. 




Stock air cooled rotax motor wasn't powerful enough for street bike but turned best motor for GNC dirt track race. Because it had capacity of durability for tune up. This 200cc motor has little space for that way. It will not for latest racing caliber but looks pretty enjoyable for all level users. Let's get some fun and see how it goes! 




Bore and stroke size will be 74.0mm x 58.0mm This number as same as yamaha XT250. It could order made racing high compression forged piston but we choose OEM yamaha piston this time. We want to use less than race machine maintenance cycle this bike for street and dirt use. Fun ride is another key.  




Stock bore is 67.0mm. It needs bored out with re-sleeve. We are in these process now at LA sleeve. 




We'll up date all work.