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Old September 4th, 2019, 09:49 AM   #1
tdyoung
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Name: Tommy
Location: CA
Join Date: Sep 2019

Motorcycle(s): Ninja 250

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Ninja 300 electrical questions

Hey all, I'm swapping a 300 motor into my 250 frame and have some questions about the specifics of the electrical system on the efi 300's compared to the carb'd 250s.

My original plan was to keep it carb'd and reuse my '05 carbs (30mm), or to spend a little bit of money and source the '86-'87 carbs (32mm, same as 300 tbs). I can swap the 250 stator over to run ignition timing.

If it's not too much hassle/$, I'd like to be fuel injected. Besides the obvious items that need to be addressed to convert a carb'd bike to efi (fuel pump, tank, etc), I was wondering how the electrical system on the 300's work, and if I could use the 300 fuel injection parts of the harness, but not the ignition control parts.

My question is if these sections of harness are isolated, or if they're for example both controlled from the same ecu box, in which case I'd probably be better to go all 300 components.
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Old September 4th, 2019, 02:51 PM   #2
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

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MOTY - 2018, MOTM - Nov '17
Hi Tommy and welcome to Ninjette!

Issue with hybrid configuration is you will have non-optimal fuel & ignition-maps using 300 engine with 250 carbs and igniter. You'll need to get wide-band O2-sensor to rough-tune AFR as close as possible by juggling jets. Then finish up on dyno to fine-tune AFR and ignition-maps. You'll also need to install some sort of programmable ignition box on 250 harness.

Also not possible to split 300's fuel and ignition functions. The 300's flywheel and crank sensors are required by 300 ECU to control both fuel and ignition. 250's ignitor won''t work with 300's flywheel & triggers and 300 won't work with 250's.

Best to get complete OEM set-up:

- 300 engine
- 300 air-box + IAT-sensor
- 300 tank w/fuel-pump
- 300 throttle bodies w/injectors+TPS+MAP-sensor
- 300 harness
- 300 ECU
- 300 exhaust

Then it's simple plug & play swap that can be done in 1-day. Pick 2 of 3, but you can't have all three:

1. low-cost
2. powerful
3. reliable & durable

Last futzed with by DannoXYZ; September 5th, 2019 at 09:30 PM.
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