Basicly everyone ist right with the Info .
Todays Bikes get from the Factorys set up very lean depend fuel economy sell and emision laws a tide .
But that dos't mean that the engine is running best on factory settings .
and the CBR/CRF 250 engines are set up very lean from Honda .
I work in my Main Job on Big Glass melting Furnaces for the last 30 years .
Basicly i am resposible for every beer bottle you ever touch in Thailand and Asia
Total differnt thing , same prinzip . If the Fuel /Air Ratio is not perfect you don't get the full Power out of a furnace and waste fuel . Big time
Talking about 1000 m/3 Gas a Day or a few hundred Liter of Diesel/Heavy Oil a hour.
So part of my Job is to set up this Furnace correct and for this reason i have all the equipment to mesure Lamda , Fuel /Air ratios CO and so on .
The CRF is set up so lean in stock that at closed trottle/ idle it run only on the smell of Gasoline .
I can not write the numbers here depend i am not at home right now but at first checks i was thinking my Instruments are damage and recalibrate the sensors.
But nearly every Engine produced its best power at about Lamda 0,87 and thats much richer then the stock CRF engine .
And that is why stock CRF engines feel so powerless if you try to do as example a quick start or open the trottle full at low revs .
Installing a high Flow Airfilter , open the Airbox (not recomend) or cut the snorkel out of the Aibox and install a other Muffler without Catalytic Converter increase
the Airflow through the engine . The PGMFI don't messure this Airflow direct , it messure the underpressure at the Trottle body and from this value calculate the Air Mass .
And for the given Air Mass it needs the correct amount of fuel . normaly about 14/1 Air/ Fuel
But the PGMFI is not programmed to do so just to follow the amount of air your modification let it use , it has its limits .
And thats where Fuel Controllers come in .
In case of the EJK it (the EJK ) gets the signal from the PGMFI (timing and duration) and modify the values to allow the fuel injector to stay longer open to let more fuel through. (simply sayed)
And this in 3 steps different low / middle and high
The transition between the Steps can be adjust and the amount of fuel in each step .
That is what the differnt numbers and lights on the EJK are for .
How much more fuel in each step is necessary is depend on the modifications (airfilter,muffler )
And thats why there are sets of differnt setting on the Internet
But they must not be necessary the correct one for you and your bike .
Riding in Phuket (Sealevel) and in the mountains around CM make a different also the Shit you put here in your Tank.
And as you open everything up to let the engine getting more air the engine runs leaner and leaner below 1800 RPM even with the EJK .
Depend on my tests i see that the aditional fuel that the ejk add start at around this RPM's
And that makes the Bike feel even weaker at start and then comes the bump with the aditional fuel and more Power.
I had that with my mods (2 short snorkel in the Airbox and a Huricane Airfilter , FMF full system . Feels shit and make you always try to keep the revs up .
Plus the engine pops out every few minutes and pops in the exhoust if i close the Trottle downhill .
I found a solution for this but thats another thing.
From what i have seen with the EJK is that ajusting the Fuel in 3 steps is not enough to give the engine in every situation the correct amount of fuel .
Sometimes its to rich , sometimes to lean and sometimes correct . in ech of the 3 steps . At full trottle its not so a big problem but at low revs small trottle openings
i was in all my tests and settings not able to get it more then 75 % correct . There was always a situation where the Lamda value was to rich or to lean .
But overall it improves the ridabillity of the engine , no question .
The Takegawa Fuel controller i use at the moment is better depend it uses a preprogramed map for differnd bike setups like stage 1 , 2,3,4,5,6, and so on and on top uf that it adds fuel that can be also adjust in the amount . All that adjust by a dipswitch on the controller .
And it deliver the necessary amount of fuel in my opinion more precise and can also decrese the amount of fuel the PGMFI want deliver .
For that reason the conection of the Takegawa Controller is a little more complicated , it need the Ignition timing , Trottle position and some more information to calculate the Injektion timing and duration on its own . And it is able to deliver more fuel from about 1400 to 1500 RPM , that make a big differnce as it is closer to idle.
