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REMO'S TIPS on getting the best out of your IAME KA100 Reedjet engine

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REMO'S TIPS on getting the best out of your IAME KA100 Reedjet engine

PIC IAME KA100 Reedjet Engine with HW33A carby

 

 

 

 

 


The information below are the tips I have experienced during my testing with the KA100 REEDJET engine. Please read these tips in conjunction with the Temporary Installation Manual by IAME

Download the IAME KA100 Reedjet Temporary Installation Manual pdfHERE
The final Installation Manual will be available sometime in January
My tips below over-ride the Manual

Now that the KA100 Reedjet is approved for practice, we are receiving many phone calls asking for a few basic set-up tips.
So to get the best out of the engine here are my tips to get you started

TILLOTSON HW-33A CARBURETTOR SETTINGS (Engine with HW-33A pictured above)
- Restricted Format: Low-Jet one turn (60min) and High-Jet one turn (60min)
- Open Format: Low-Jet one turn (60min) and High-Jet one turn and a bit (1.05min).
- Metering Lever Height: Top of the lever should be dead-level with the Carby body.
- Pop Off Pressure: 11PSI +or- 1PSI.


TILLOTSON HL-398A CARBURETTOR SETTINGS - KA100 REEDJET ENGINE

J Version - Restricted (19mm)
LOW JET 1 hour & 45 minutes (1 & 3/4 turn out)
HIGH JET 45 minutes (3/4 turn out)

Clubman Version- (unrestricted)
LOW JET 1 hour & 45 to 55 minutes (Just under 2 turns out)
HIGH JET 45 minutes (3/4 turn out)

IDLE SCREW - J Version Restricted (19mm) and Clubman Version (unrestricted)
Screw the idle JET up to around 2,000 to 2,500 RPM this makes starting very easy.
Pop-Off Pressure:  8 to 10 PSI
Metering Lever: Level with body


GEARING

J Version - Restricted (19mm)
The engine comes fitted standard with an 11 tooth front sprocket.
So a good starting point is the same rear sprocket as you are currently using on your J engine.
(Example; if you have 12/78 as your J gearing, the KA100 engine would be 11/78)
To work out your appropriate gearing you need to be doing around13,000 RPM + or - 400 RPM, depending on the circuit.
It is just simple trial and error.

Clubman Version - (unrestricted)

The engine comes fitted standard with an 11 tooth front sprocket.
So a good starting point is the same rear sprocket as you are currently using on your Clubman engine.
(Example; if you have 10/78 as your Clubman gearing, the KA100 engine would be 11/78)
To work out your appropriate gearing you need to be doing around14,500 RPM + or - 400 RPM, depending on the circuit.
It is just simple trial and error.


OIL RATIO

16:1 is on the safe side as we do not know the quality of oil some customers use or the age of the fuel.


AIR FILTER

You must use a good quality oil on the AIR FILTER.

This is because during our testing we found that if you did not oil your air filter (being a reed valve engine) the carburettor is mounted in the front of the crankcase which feeds dirt straight into your big-end cage, shortening your bottom end life.

This is the normal procedure of oiling the air filter on any reed valve engine.
It is preventative maintenance and helps you protect your investment.


SPARK PLUG

Cold Weather: NGK 9EGV
Hot Weather: NGK 9.5EGV to 10EGV


RUNNING IN FOR THE FIRST TIME (J and Clubman Version)

My suggestion is to run-in for 30 minutes of 3 x 10 minute sessions.

First 10 minutes 6,000 to 9,000 RPM on and off the throttle pedal.
Next 10 minutes up to 12,000 RPM on and off the throttle pedal.
Final 10 minutes up to 14,000 RPM on and off the throttle pedal.
During my final 10 minute run-in I open up the High JET to 1-turn and drive it flat out.

Now that you have run-in your KA100 Reedjet engine, each time you hit the circuit I recommend at least 1 lap warm up before you go flat out down the straight for the fist time as the engine runs extremely efficient and runs much much colder than your current J or S engine.

By not warming the engine up correctly, you do run the risk of cold seizing the first time down the straight if you go flat out at maximum RPM.
Don't take this negatively as I am just being cautious with new karters.

What is cold seizing?
The piston expands at a greater rate than the cylinder wall. Hence the piston to bore clearance becomes tighter than normal and this could cause a cold seize.


EXHAUST SPRINGS

To prevent the exhaust springs from breaking, wrap tie wire around the two exhaust springs to stop the springs from vibrating.
This prolongs the life of the exhaust springs. Alternatively, I use an old pedal spring (100mm or so, long) and wrap this around the two exhaust springs and this will do the same thing.

HOW TO GET THE BEST OUT OF YOUR ENGINE:

"Helping to prevent fouling of SPARK PLUGS"
As your KA100 engine runs so efficiently in cylinder head temperature on your roll down laps, there is a good possibility that you have unburnt fuel in your combustion chamber. So when you go to restart your engine prior to your next session, it may be possible that you will foul your spark plug when starting up your engine. To help prevent this unburnt fuel on your roll down lap, simply hold your throttle pedal on the cracked open position (around 4000rpm) and then apply slight brake pedal pressure (this is called riding the brake) this will put the engine under load, and burn all excess fuel.

ANOTHER TIP is to depress the kill switch button on the way into the in-grid and just roll into your stop position. Also a hotter Spark Plug will help this. Your engine comes with a 10 heat range plug. This is a conservative plug and may run too cold. I suggest to move to a NGK B9EGV-9.5 Plug.

ANOTHER TIP: Also when restarting your engine heading out for your next session, just have your throttle pedal cracked open and simply press the 'on button' and drive straight out, do not sit there idling for a long period of time as this can also foul the plug.

ANOTHER TIP: During your first formation lap, give your KA100 engine a short burst of full throttle, this will also help clear the plug from fouling.

ANOTHER TIP: During your formation lap prior to getting a start, it is also advisable to have your throttle pedal at a cracked open position at a constant speed and apply pressure to the brake pedal, which puts the engine under load and burns excess fuel which will prevent fouling the plug as well. By following my formation lap procedure the engine will accelerate cleanly off the line and you will get an excellent start.


I hope my tips help you enjoy countless hours of fun with your new IAME KA100 Reedjet engine

REMO LUCIANI