The Low Rent Hawk 250 DLX Page
Last Updated - 11/12/2020
Fuel Injection System
I understand not everyone is well versed in fuel injection jargon, so below you will also find a list of definitions. All pinouts are shown with their ECM pin out assignments, IE: J1/2-## so you can easily diagnose wiring issues on your bike. Many of the components on this bike are branded "Motion" with no obvious part number cross reference, but I've been finding their actual OEM sources. My Hawk is a 2020, so do always cross check my information against YOUR specific bike!
NOTE: ECU is trivial to interface with for diagnostic purposes here thanks to this software: HUD ECU Hacker. Later on I will also provide more diagnostic cable assembly information as well, but really everything you need is already there. This ECU is also supported by BitEdit/BitBox for reflashing (ie: permanently modifying the tune), considering purchasing that but I really don't need it right now.
Picture of the ECM (Large)
ECM Pin Assignments:
ECM Only (looking at the ECM)
Throttle Body & Related Sensors:
Loreada 32MM (branded Motion on my bike) TB
TPS/IAT/MAP are integrated into a single sensor (first time I'd personally seen this, MAP+IAT is common though now) with these numbers silkscreened on top: 003-99-009 / 27719A
IACV - GM style (like what you would find on a lot of 1980/90's GM vehicles), with these numbers silkscreened on top: 26178
NOTE: It doesn't seem Loreada has an exact match of a 32MM TB + this exact sensor combination on their website. The connectors are the same though, so its likely it would work, but obviously I make no guarantees. I did validate with calipers though the throttle body is indeed 32MM. As of the last update, I have not had the chance to email Loreada about the specifications of these TB's:
32MM Version TB
26MM Version TB
TPS/IAT/MAP Connector Pin Out:
IACV Connector Pin Out:
Motion branded FP with these numbers embossed on the plastic basket: PW 3003 B / 20200608
NOTE: I've been looking for a higher quality and more easily obtained replacment pump, but not really dug too far yet. You can buy the entire basket and pump from various vendors (TX Powersports, etc), and I also managed to track down this pump on Alibaba HERE. I will say, just from personal experience, it almost looks like an old Suzuki (I'm talking early fuel injected models) fuel pump, but I've not validated that.
I have also not yet had a chance to check its operating pressure, but we can take some wild guesses given the fuel injector type. Given the injector is an EV6 style, I would speculate its around 43.5PSI.
Fuel Pump Pictures:
Fuel Pump Exploded (Large Image)
Fuel Side View (Large Image)
Fuel Top View (Large Image)
Fuel Pump Basket Part Number (Large Image)
Actual fuel pump dimensions:
Total pump height: 70mm
Metal barrel length: 53mm
Metal barrel diameter: 28mm
Plastic top barrel diameter: 24mm
Plastic top barrel height: 14mm
Pump outlet height: 14mm
Pump outlet diameter (where it inserts into plastic basket): 7mm
Pump plastic base height: 3mm
Fuel Pump Connector Pin Out:
Unknown Delphi EV6 "short" style fuel injector, with these numbers silkscreened on top: 28334878
NOTE: This injector appears to be used in a lot of applications, but I had no luck finding its flow rate. If you have any informaiton on this injector, please let me know. They are cheap to get your hands on, so maybe I'll send one in to like Fuel Injector Clinic someday to get it flow tested. The part number, while Delphi style, doesn't seem to be a legitimate Delphi part number.
USCAR style connector
I measured 12.5 ohms, so it is a saturated / high impedence injector
Fuel Injector Connector Pin Out:
Cylinder Head Temperature Sensor:
Working on this section still.
Has the following eteched into the sensor housing:
NOTE: Looks like a pretty standard four wire heated narrowband oxygen sensor, you see these all over Alibaba like HERE. It is the smaller M12 thread (vs M18 like you'd see on a car or other bikes) style sensor housing. Looks like the same connector I've seen on Honda's, Ducati's and other brand bikes over the years, so it is easily obtainable. I'll post up a better source for one like it at some point.
Working on this section still.
Has the following silkscreened into the coil body:
NOTE: Pretty generic Chinese bike coil, but from what I'm told, the lead is a little shorter than the standard Hawk? The coil is also mounted to the frame just right of the triple clamp tube. I would guess if this fails, about any coil of this style you dig up will work with whatever the dwell settings are on the ECM.
Rectifier / Regulator:
Working on this section still. Possibly 200W based on the silkscreened data on it.
ECM - E.ngine C.ontrol M.odule: The brain box if you will.
TB - T.hrottle B.ody
FP - F.uel P.ump
TPS - T.hrottle P.osition S.ensor: Measures the current position/angle of the throttle plate.
MAP - M.anifold A.bsolute P.ressure Sensor: Measures the pressure (vacuum) after the throttle plate, used to calculate engine load.
IAT - I.ntake A.ir T.emperature Sensor (note, sometimes reffered to as MAT - M.anifold A.ir T.emperature Sensor): Measures the temperature of the air entering passing through the throttle body.
IACV - I.dle A.ir C.ontrol V.alve: Raises or lowers the idle of the engine as commanded.
CHT - C.ylinder H.ead T.emperature Sensor
O2 - Oxygen (o2) Sensor: Measures the oxygen content of the exhaust gas. Used to determine if the ECM should add or subtract fuel during closed loop operations.
Crank Trigger Sensor Sensor: Informs the ECM the current position of the crankshaft, it is located next/with the stator.