Rave Reviews

Hey Stevo, thanks for building my son’s YZ112 Supermini motor. This thing rips and is super smooth...

 

 

WANTED: Your Cores

Got spent crank and / or cylinder cores?  We'll take 'em!  And we'll compensate you for any core we receive that can be rebuilt.  Get in touch and send or bring it on in!

Tech Tips

Tech Tip #1

YZ 125/250F Clutch Fibers:  When replacing clutch fibers for these bikes there are two different types of fibers that go into a stock oem clutch. The inner most and outer fiber is Yamaha part #3XJ-16321-00 and the other fibers are part #5DH-16321-00. The reason for this is the inner diameter is bigger. This prevents chafing on the 125 and allows room for the tension washer on the 250F. If you buy an aftermarket set, some companies mark their bigger diameter fibers.  We strongly suggest pre-soaking all fibers for a couple of hours before installation.

Home > Services > Clutch Mods
Clutch Mods

 

Clutch Problems???  Broken Plates???  We can fix 'em, and help you prevent problems in the future, too.

Through our years of experience we have found heat to be the number one source of clutch problems.  When you encounter a broken clutch fiber the chances are it was heat stress that caused the fiber to fail.

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STR Clutch Mods

Our solution to keep the clutch cool?  Send us your inner hub and clutch basket.  For $50 we will machine slots in the clutch basket fingers (ala Hinson) and drill holes through the inner hub to increase oil flow to the clutch components (see photo left).  This is done on our computer indexer in the Bridgeport.  The factories don't do this because they cannot be cast in this form and it is not cost effective to machine them after. 

After five months of testing our 250 clutches with these modifications our steels look like they just came out of the package!

 

One day turn-around

        Clutch Kits $150?   STR Clutch Mods $50? - You Do The Math

 

 

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