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Author Topic: CRF250L - Understanding F.I  (Read 406 times)

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Offline marlon

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CRF250L - Understanding F.I
« on: December 28, 2020, 11:54:13 am »
Morning.
Hope you're all free of weird viruses.  :pot:

I want to ask about Fuel Injection, since this is the first non-carb bike I have.
I'm not keen on "modding" for the sake of it, and I don't intend to do any non-functional farkles, but I would like to suck out an extra hp somewhere. The spark arrestor comes to mind, and at the same time it would take away the annoying whistley pansy sound at road speeds.

However, there's a few parks of thought when it come to F.I. (specifically on my 2020 CRF250L)

1. The injection computer will auto sense stuff like a free flow in the header/silencer, and will adjust. So no worry.
2. The bike will run even leaner than it runs stock. Do worry.
3. Get a EJK and solve all the problems.

My problem with 3. is finding suppliers in SA and secondly, factory warranty. So it's not really an option for the next 3 years :(

How does FI really work and does it auto compensate? Can I trust it to always keep the mix right, or what the fap.

Thanks for teaching me  :thumleft:
M
 

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Re: CRF250L - Understanding F.I
« Reply #1 on: December 28, 2020, 01:22:35 pm »
Letís discuss these things when you are here
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Offline DUSTRIDERS

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Re: CRF250L - Understanding F.I
« Reply #2 on: December 28, 2020, 01:24:16 pm »
Don't fiddle too much but you could change the front sprocket to a 13 tooth I think.(just make sure the internet has few topics about it)
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Offline marlon

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Re: CRF250L - Understanding F.I
« Reply #3 on: December 28, 2020, 01:34:15 pm »
Letís discuss these things when you are here

Fair enough.
In terms of forum usefulness, the replies will also help others in the future. But Ill bring back the info after we spoke tomorrow, Dux.

Does anyone know who supplies EJK?

 

Offline marlon

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Re: CRF250L - Understanding F.I
« Reply #4 on: January 08, 2021, 11:29:01 am »
I am necromancing this one, because the issue stands.

Does anyone have any experience with EJK? I noticed someone here is an agent for them, but they haven't responded to my PM yet  :peepwall:

I am still committed to NOT being louder, but becoming less lean (Honda techy confirmed with me that the stock setup is super lean for emissions control).
If I remove my spark arrestor (and deal with the tail light melting problem), and have an EJK fitted, it should solve the issue.
But I still don't understand if need an EJK or if F.I will compensate enough.

My guess is that there is a fuel mix ratio, and if you alter anything, the F.I will compensate, but maintain the ratio. So that probably won't help.

Anyway, your 50cents will be taken with appreciation
 

Online teebag

Re: CRF250L - Understanding F.I
« Reply #5 on: January 08, 2021, 01:16:05 pm »
change the gearing, remove the snorkel from the airbox, remove the stainless flash screen from the std air filter


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Offline LoopSoosStroop

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Re: CRF250L - Understanding F.I
« Reply #6 on: January 08, 2021, 03:23:09 pm »
Doesn't the L and RL run closed loop FI? I cannot remember if I ever saw a oxygen sensor in the exhaust?

Well, if it does, you don't need to worry about fuel mix. Isn't that the whole point of closed loop FI control, adjusting automatically for altitude and pressure changes?
 

Offline Vis Arend

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Re: CRF250L - Understanding F.I
« Reply #7 on: January 08, 2021, 07:55:19 pm »
 :sip:
No matter how slow you go, you're still lapping everybody on the the couch
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Offline marlon

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Re: CRF250L - Understanding F.I
« Reply #8 on: January 12, 2021, 09:22:42 am »
Doesn't the L and RL run closed loop FI? I cannot remember if I ever saw a oxygen sensor in the exhaust?

Well, if it does, you don't need to worry about fuel mix. Isn't that the whole point of closed loop FI control, adjusting automatically for altitude and pressure changes?

Also not sure, I haven't noticed anything either.
I do notice that I have to gear back EVERYTIME the uphill is more than 0.00000001 degrees. So once I understand the "Safety" of fuel ratio here, I will likely remove the spark arrestor and backfire screen. Not at the risk of running leaner though.

The second issue is of course, warranty, and how it's affected.
 

Online teebag

Re: CRF250L - Understanding F.I
« Reply #9 on: January 12, 2021, 09:59:02 am »
change the gearing


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Offline sidetrack

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Re: CRF250L - Understanding F.I
« Reply #10 on: January 28, 2021, 12:26:38 pm »
What does a Fi bike use to determine amount of fuel to squirt at different temps and altitude ? I see an oxygen sensor in the pipe and one temp in the airbox, is it a combination of the two ?
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Offline GeenSand

Re: CRF250L - Understanding F.I
« Reply #11 on: January 28, 2021, 12:35:32 pm »
Most vehicle engine ecu's have a build in atmospherical pressure sensor. Used to do hight compensation. Not sure about the honda.

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Offline Jacobsroodt

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Re: CRF250L - Understanding F.I
« Reply #12 on: January 28, 2021, 01:38:57 pm »
Fit a 13t front sprocket. It immediately livens up the bike.
Airbox mod - not holes on the side, but fit a 55 or 60mm 90į pipe to keep induction noise away.
Fit an EJK. It livens the bike up a bit.
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Offline Jacobsroodt

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Re: CRF250L - Understanding F.I
« Reply #13 on: January 28, 2021, 01:41:31 pm »
I stock EJK for 2013-16 CRF250L. Awaiting stock for 2017-20 and Rallye.
EJK lengthens the injection timing slightly to add more petrol. You can fine tune it.
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Offline Jacobsroodt

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Re: CRF250L - Understanding F.I
« Reply #14 on: February 19, 2021, 05:10:32 pm »
Just to confirm that the EJK for the 13-16 and 17-20 CRF250L and Rally is now available.
BoosterPlug, LED Spots, Tool Tubes, RustStop, Kappa Screens, Top boxes, Tank Bags, ATG Gear - whatever works for me.