Why you should flush the methanol
out engine with gas after racing.
This was a brand new float bowl
with the methanol left in it for two
|Using my special wrench
for adjusting the idle
mixture on a WF carb
|SETTING IGNITION TIMING ON
THE JR RACECAR FLYWHEEL
The in the hole method will work if
you want to take the head off
|Valve Adjusting at TDC.
Tip: Remove locktight from set
Follow cam MFG. Guide lines for
|Finding TDC with the head
removed using a dead stop and
degree wheel. You can also set
the ignition timing with the degree
|Finding TCD with the head
installed using a dead stop that
replaces the spark plug.
GREAT TOOL FOR SETTING TIMING
WITH THE HEAD ON.
One tool works For
Animal and World
|Setting the coil air gap using a
business card. I'd use two or three
to get the proper clearance.
PLASTIC FEELER GAUGES WORK
SET AT .016" to .020"
|Set FLOAT DROP first. Check the
adjustment with the carb right side up.
Bend the stop tab on the float. Located
behind the peg (blue arrow) Be careful
not to bend it too much (ha ha)
ALSO NOW WORKS ON WORLD
|Check the FLOAT LEVEL with the carb
Set the float level by bending the tab
(painted red) Do not compress spring
in the needle.
Float Gauge $19.95
|Setting timing using the in the hole
30* = .190" 34* = .243"
31* = .200" 35* = .256"
32* = .215" 36* = .269"
33* + .230" 37* = .285"
|The ignition firing point for the
Older JR Racecar flywheel
Set timing with black line just
comming out from under the coil
Finding Top Dead Center (TDC)
Install the degree wheel on the PTO side of the engine with the numbers facing the block.
Make sure it's centered (doesn't wobble)
Make a pointer from a piece of stiff wire and attach it to one of the bolts on top of the engine.
Remove the spark plug and turn the engine so the piston is all the way up to the top of the
bore. Look through the spark plug hole and get the piston as close to the top as you can.
Loosen the bolt holding the degree wheel to the crankshaft and rotate the degree wheel so
the pointer is lined up with the TDC mark on the degree wheel.
Turn the engine clock wise about 60 degrees and install the dead stop[ in the spark plug
From this point on be careful not to turn the engine too fast and crash into the dead stop.
Turn the engine counterclockwise until the piston touches the dead stop. For explanation
purposes lets say it stops at 40 degrees. Turn the engine clockwise (the other direction)
until the piston hits the dead stop again. Lets say it stops at 20 degrees. Loosen the bolt
holding the degree wheel and rotate the degree wheel to 30 degrees and re-tighten the bolt.
In a perfect world zero degrees will be exactly TDC. In reality you will have to repeat the
process to fine tune things to get exactly TDC.
When you have everything just right the degree wheel will stop at exactly
30 degrees when you turn the engine in both directions
TDC Top Dead Center
BTDC Before Top Dead CEnter
ATDC After Top Dead Center
BDC Bottom Dead Center
BBDC Before Bottom Dead Center
ABDC After Bottom Dead Center
If for some reason you can't flush the engine
with gas make up some plumbing so you can
connect the WD 40 to a piece of fuel line.
Connect it to the fuel inlet of the carb, open
the float bowl drain and flush out the methanol.
$15.00 Ha Ha
Cleaned with Brake Clean
Cleaned with Soap and water
and then with oil on the towel.
Not cleaning the rod throughly can result in disaster.
The grit left behind can cause the rod to seize to the crank.
Be sure to clean it throughly especially if you hone it.
The final test for cleanliness is to use oil on a towel and
manually clean the rod..
Blown Head Gasket
If you think the head gasket is leaking look between the air shield and the block. In
other words look where the head and block meet on the top side of the motor. If you
see dark streaks on the block surface the head gasket is leaking. If you squirt some
WD 40 in the carb look for smoke coming out from under the tin air shield it also
indicates a leak.
The head gasket can leak in other spots as well but the top side is the most common.
You should occasionally remove the header and re-torque the head bolt next to the
Don't tape the blower housing up too much. Keep the head temp below 380 and it will
|Simulated with a magic marker
|To install the Dyno billet cam gear straight up line up
the dots as shown below.
To setup this billet adjustale cam in your block you must first locate the
Dyno Cams logo on the camshaft gear.
The "0" or stock location timing mark will be about 2 teeth to the right.
If you want to advance or retard the camshaft centerlines remove the 7
allen head screws. remove the gear from the cam and clean all
Example: If you want to advance the camshaft by 4 degrees: locate the
+4 on the timing gear and install the +4 where the "0" mark was.
Remember you will always us the timing mark just to the right or the "0"
"+2" "-2" "+4" etc.
Install the 7 screws and torque to 85 INCH lbs
|To fit the standard prefilter sock to the tapered air filter
required on the LO 206 simply fold it over the outboard end of
the filter. This will make it fit tight
You should not have to use any zip ties or rubber bands to
hold it in place. If you want to put another filter on the other
end it will give you double protection.
|How i mount the fuel
|How to keep the rain out.
There are many ways to do it but
this empty plastic coffee can looks
nice and works very well.
ARC rod on the top
Briggs World Formula rod on the bottom
|Normal spark plug for a LO 206
It's normal for the center electrode to be white and the outer
metal part to be extremely black.
|Legal spark plug for the LO
206 must have the Briggs
emblems on both sides and
be a Champion RC12YC
Extreme carbon build up on the back of the intake valve could
be caused by poor valve sealing at the valve seat. It could
also be cause by fuel vapor left in the intake port after
shutting the engine off.
Put the engine on TDC when you shut it off.