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video tutorial
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How to set timing on small billet flywheels

The small billet flywheels we sell for the Briggs 305 engines and the GX-390 engines were the
original billet flywheels built for the Briggs Animal engines. We re cut the taper on these
flywheels to fit these larger engines.
The flywheel key does NOT hold the flywheel in place. The keys are only used during a
production line assembly to speed up the assembly process. The taper and lock made
between the flywheel and the crankshaft is what holds them together. The way to set the
timing is to first decide how much ignition advance you want to run in your engine.
Remember, with alcohol you can run much more ignition advance than you can with gasoline.
So, use a dial indicator to set the piston at Top Dead Center (TDC) then determine where
you wish to fire the ignition. This number will change with various fuels, altitudes, humidity's,
and engine builder theories. If you wish it to fire at say, .200" in the hole, rotate the crank
backwards until the piston drops into the cylinder .200". Then, locate the flywheel to where
the trailing edge of the magnet is just underneath the right side of the left leg on the coil.
That is the firing point. After you torque down the starter nut and the flywheel is locked in
place, it is very easy to shine a timing light on the flywheel and notice exactly where the
magnet is in relation to the coil. Most stock engines like around 21* to 26* timing. Most
modified motors like between 28* and 36* timing. I hope this helps.
GX390 Piston & Rings Instructions
  • -The rod should be torqued to 26 foot pounds.
  • -The head should be torqued to 15 foot pounds.
  • -In some cases you will have an extra ring inside the ring box,
    some people need it some don't, you will know when you install.


Grove lock spacers (GLS or oil ring support rails) are to be used in
applications where the oil ring groove intersects the pin hole, and used
only on pistons which have the oil ring grooves machined to .030 wider
than your oil rings.  Example: a .187 oil ring uses a .218 groove for a GLS.
1.         Hang and align rods in the normal manner, either press fitting
rods, or using spiro-lox for pin retention. (Tru-arcs or wire lox also
2.        Install GLS against the bottom sill of the oil ring groove.  The
dimple must be oriented downward and over the wrist pin hole.  The end
gap should now be 90 degrees from the wrist pin hole.
3.        Visually check spacer end gap.  File for a .010 to .187 end gap.  Do
not exceed .187.
4.        The GLS must hug the back (root) of the oil ring groove to
prevent it from spinning in the groove.
5.        Install your regular ring set in the conventional manner atop GLS.

Packing Your Engine:

What Not to Do:

1. The use of packaging peanuts (styrofoam)

2. Not emptying all fluids from motor before shipping
3. Not using enough packaging around the motor (especially the crankshaft)

If you ship with one of the errors above, not only is it likely that your engine will be damaged upon
receipt it is also most likely UPS will not cover it even if you have purchased insurance!

What To Do:

1. Plug all open holes on engine with paper towels (to keep out dirt, newspaper etc..).

2. Put extra cardboard in bottom of box and around motor.

3. Use individual pieces of newspaper tightly wadded to pack around engine all the way to the top,
make sure to pack to the top so it doesn't cave in during transportation.

4. Insure your engine, insure only for the actual amount of replacement, UPS will not give you $1000
refund for a $500 engine, even if you paid for $1000 worth of insurance, that would be considered

Again, remember, if you do not have your engine packed properly (and UPS will check) you will not
be reimbursed for damage even when you pay for insurance.
Clements Racing Products
New or Rebuilt Engine,

Use Fresh Oil Every Race Day

Run Gasoline through motor each night of
Note:  When the gas hose is hooked to
the fuel pump & you run the engine the
gasoline will purge the fuel pump,
carburetor and internal engine
components, you know you’ve run enough
gas through when the engine runs rough
or black smoke comes out the exhaust
pipe.  Shut the engine off, turn the engine
over by hand until it’s on compression
stroke, then drain out all the old
contaminated oil.
REMEMBER to put Fresh Oil in
before you start the engine again.

If you run a Pumper Carb:  If the engine
stumbles leaving the pits, slightly open the
low speed screw on the carburetor.  If it
stumbles or shuts off at high speed, turn in
slightly on the high speed screw until it
runs proper.
Note: These Pumper Carbs act like fuel
injection, the fuel entering the airstream is
somewhat pressurized by the redundant
fuel pumps, therefore, a small amount of
fuel dripping from the carburetor is
If you run a
Flatslide Carburetor:  
Remove drain plug at bottom of float
bowl and let all the fuel out at end of each
race day.
You know your Engine Needs to be
Freshened when it slows down, starts
smoking excessively or starts blowing oil
out of the breather and into the catch