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.

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Crank Work

Top-notch Stroker Cranks, Crank Rebuilding and Crank Balancing



Crank Balancing

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Crank Rebuilding
Don't mess with the rest - Use the now recognized best...  
Dead True!  No Hammers!  STR has developed a system to assemble single cylinder cranks the way the factories build theirs.  Rebuilt with a max runout of .001.  We stock and use ProX Genuine Racing Parts for YZ's, KX's and RM's from '90 to 2011.
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Stroker Cranks

STR offers stroker cranks made to your specs...

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