o2 sensor bypass hawk DLX

wvsv650 · 10-22-2021, 10:00 PM

I am looking for resistor info to remove the o2 sensor, richer fuel charge
2021 HAWK DLX

John Holifield · 10-24-2021, 11:45 AM

These DLX bikes are too new and parts for them aren't available yet. Even things like installing resisters to cure lean condition or even being able to make changes to the ECM are not really available either. I wish I would have purchased the standard Carbed version because those have been around for a long time and parts and mods are widely available.

franque · 10-25-2021, 10:17 AM

I'd leave it alone, the O2 sensor is a necessary part of making any EFI function well.

**JerryHawk250** · 10-25-2021, 11:38 AM

Leave the O2 sensor in place. You can add a resister inline to the IAT sensor to trick the ECU into thinking the intake air temperature is cooler that it actually is which will make it run richer. Since no one on here has actually done it i can't give you the resister value needed. Resisters are cheap. you could buy an assortment of resisters and start some trial and error testing. Do some Google research. You might run across a forum on tuning small cc EFI engines. It really isn't rocket science. Believe me, if I had an EFI Hawk i would of done the testing myself.

tknj99 · 10-25-2021, 11:41 AM

Here's a detailed explanation i read in the past when i was looking into the same thing for my former RX4:
https://www.boosterplug.com/shop/cms...l-version.html

lateracer · 10-25-2021, 03:54 PM

Cheap and easy race car solution - If it runs without the sensor plugged in, then try that.

Most single sensor O2 setups operate rich in open loop mode while the motor is cold.

rideMI · 10-25-2021, 10:44 PM

Buy/Build a programmable ECU, I think you have Delphi EFI?
Having a programmable ECU you make the engine what you
want it to be. WARNING I have made engines POOF!

John Holifield · 10-26-2021, 10:38 AM

Quote:

Originally Posted by lateracer

Cheap and easy race car solution - If it runs without the sensor plugged in, then try that.

Most single sensor O2 setups operate rich in open loop mode while the motor is cold.

What happens when the motor is warmed up and hot?

cycleway4 · 10-26-2021, 12:22 PM

with the O2 sensor unplugged,...it will still be in open loop,..which is the reason for leaving it unplugged. until the plugged-in sensor gets up to temperature, it will not go to closed loop.

lateracer · 10-31-2021, 09:04 AM

Quote:

Originally Posted by John Holifield

What happens when the motor is warmed up and hot?

When it warms up, it goes to closed loop where it adjusts fuel mix based on air/fuel ratio in exhaust. When cold, the amount of fuel injected is determined by the throttle position sensor.

Haven’t had a chance to go hands on with a dlx yet though, so basing my responses from car world experience.

10-22-2021, 10:00 PM	#1
wvsv650 Join Date: Aug 2021 Posts: 1	o2 sensor bypass hawk DLX I am looking for resistor info to remove the o2 sensor, richer fuel charge 2021 HAWK DLX
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10-25-2021, 11:38 AM	#4
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,553	Leave the O2 sensor in place. You can add a resister inline to the IAT sensor to trick the ECU into thinking the intake air temperature is cooler that it actually is which will make it run richer. Since no one on here has actually done it i can't give you the resister value needed. Resisters are cheap. you could buy an assortment of resisters and start some trial and error testing. Do some Google research. You might run across a forum on tuning small cc EFI engines. It really isn't rocket science. Believe me, if I had an EFI Hawk i would of done the testing myself. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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10-25-2021, 11:41 AM	#5
tknj99 Join Date: Oct 2020 Location: Central VA Posts: 1,254	Here's a detailed explanation i read in the past when i was looking into the same thing for my former RX4: https://www.boosterplug.com/shop/cms...l-version.html __________________ 2024 Zuma Storm 150 DLX 2019 Beta 430 RRS 2017 Honda Fury Former China Bikes: Tao DBX1, Brozz 250, CSC RX4, Titan DLX, Templar X
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10-25-2021, 10:44 PM	#7
rideMI Join Date: Nov 2016 Posts: 36	Programmable ECU Buy/Build a programmable ECU, I think you have Delphi EFI? Having a programmable ECU you make the engine what you want it to be. WARNING I have made engines POOF!
	0

10-26-2021, 12:22 PM	#9
cycleway4 Join Date: Feb 2007 Location: Virginia Posts: 269	with the O2 sensor unplugged,...it will still be in open loop,..which is the reason for leaving it unplugged. until the plugged-in sensor gets up to temperature, it will not go to closed loop. __________________ <div>Steve 2006 Roketa DB-07A/RSX-200E 2008 Roketa 250 Scooter 2019 Brozz 250
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10-24-2021, 11:45 AM	#2
John Holifield Join Date: Oct 2021 Posts: 11	These DLX bikes are too new and parts for them aren't available yet. Even things like installing resisters to cure lean condition or even being able to make changes to the ECM are not really available either. I wish I would have purchased the standard Carbed version because those have been around for a long time and parts and mods are widely available.
	0

10-25-2021, 10:17 AM	#3
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	I'd leave it alone, the O2 sensor is a necessary part of making any EFI function well.
	2

10-25-2021, 03:54 PM	#6
lateracer Join Date: Sep 2021 Posts: 3	Cheap and easy race car solution - If it runs without the sensor plugged in, then try that. Most single sensor O2 setups operate rich in open loop mode while the motor is cold.
	0