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 > Crank Work > Crank Balancing
Crank Balancing

Engine vibration costs you power and money...Make it right with expert crank balancing, and save on both.

STR's custom built balancerSuzuki RM & CR 500 owners take note!

You want the most out of your motor don't you?  The crank is the heart of your motor. The factory bikes all have balanced cranks so why not you.  Once you ride a bike with a balanced crank you will realize why it is important. 1/4 oz of imbalance @8000 RPM's causes 114 lbs of force on your main bearings at every revolution.  This force, known as imbalance can be controlled.  We have found that most stock OEM cranks have about 1/2 oz of imbalance, some up to 50 grams.  If you have either an overbore or a stroker it is even more significant. 

 

 

Crank balancing is the removal or adding of material without the connecting rod in place. 
This is not to be confused with truing. 

 

Rod big end weight

For the shops doing their own cranks, you can ship us the crank assembled with the rod & bearing. We will balance it to the parts you sent us (top end, rod, bearings).

For the consumer you send us your crank as is with the top end you will be running and your choice for rod kit. We also can supply both.

 

Pricing:

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Balance - $300 assembled crank w/o rod adding heavy metal

Total top end weight

Complete Crank - $375 to disassemble, assemble, balance, disassemble & assemble and true removing metal

Complete Crank - $475 to disassemble, assemble, balance, disassemble & assemble and true adding heavy metal  


                     

 

    Checking crank

This is the correct way to check runout from journal to journal.

 



 

 

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