dyno check list

 1) FULL TANK OF FUEL (FUEL YOU WILL BE RUNNING)  (NO OCTAIN BOOSTERS)

 2) GOOD BACK TIRE 

 3) 40 PSI TIRE PRESSURE

 4) CHECK OIL ( MOTOR, PRIMARY & TRANS )

 5) BELT TENSION

 6) CLEAN AIR FILTER

 7) NO LEAKS

 8) NO CHECK ENGINE LIGHTS ON

 

 

   Compression Test:

 The numbers shouldn't  deviate more than 10% from front to rear cylinders.  Some aggressive cams will drop your readings by 20 to 30%, so do not get too concerned if the #s are lower. Also, make sure the compression releases are turned off, and they do not have easy start cams, or the #s will be even lower.

 

  8:1-8.5:1 compression: 150-170 psi per cylinder

  8.5:1~9.5:1 compression: 170-210 psi per cylinder

  9.5:1~11:1 compression: 210-275 psi per cylinder

  11:1+ compression: 250+ per cylinder (highly depends on cams being used)

 

The tested numbers should not vary anymore than 10% from cylinder to cylinder or this may indicate a problem.

Results: Cylinder #1 ______ Cylinder #2 ______  Percent difference _______

  

Change plugs:

Run the correct heat range plug and gap for your application.  A boosted bike will need a much tighter gap than an all-motor setup.  If you do not know what plugs to run or what to gap them at, give us a call. 

  

Oil change:

An oil and filter change is a good idea prior to tuning if it has been more than 3,000 miles since the last oil change, or if the engine has been repeatedly flooded from a poor tune or any other reason.
 

NOT NECCESSARY BUT A GOOD IDEA

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