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

 

 

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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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Tech Tip #2

Air Filters:  The key ingredient to having a motor run great and to increase it's longevity is a clean air filter. Most people neglect this simple maintenance task. Try riding your dirt bike with your mouth three quarters closed and see how well you perform. You should always have readily available, pre-oiled, clean filters.  Here's how...

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Tech Tip #3

Four Strokes!  Magneto maintenance; take the time to remove your magneto case and remove your flywheel and clean all the debris that has built up on the magnets. This stuff is stuck there because it is metallic (not good for engine longevity).

 

Tech Tip #4

Don't be misled - Dyno Talk coming soon!!!

 

Tech Tip #5

'06 - '07 YZ 125 Shifting Problems?  If you are having trouble finding neutral, you will need to replace the shifter stopper lever (part #1C3-18140-10). As you can see in the picture below, the new part on the right still has the bearing needed to control the shifting drum.  The repair requires the removal of the clutch basket.

 

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The three major contributors to engine failure are dirt, detonation and water. We can control detonation with race fuel and we can keep water out by replacing O-rings on exhaust and making sure none enters when pressure washing. Dirt is up to you! We have told you this before in previous tech tips. Dirt is the most common cause of engine failure. Since dirt can only enter through the air filter or the air boot, it is up to you to maintain these areas. The picture below illustrates catastrophic failure due to dirt.

 

Tech Tip #7

For Four Stroke riders including pit bikers, we strongly suggest constantly adding fuel conditioner and stabilizer to the $3.30/gallon gasoline that America's oil industries are giving us. This gas goes bad so fast it is almost a given it will clog your pilot jet. The smaller the hole, the easier it is to clog. We use Spectro FC Premium which is a great product to help ward off this problem.

 

 Tech Tip #8

KX250F smoked crank on leftKX 250F owners beware.  Crank on the left in picture is a brand new OEM 2010 KX 250F crank.  If you compare it to the crank on the right you will see the crank pin was put in backwards.  This won't allow any oil flow to the connecting rod, hence TOTAL FAILURE!!  So if you are replacing the crank on any of your KX 250F's check to see that the dot on the pin is on the clutch side before installing as shown on the crank on the right.

 


 

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