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Eclipze · (This post was last modified: 07/06/2010 21:55 by Eclipze.)

Sidestand, Clutch and Neutral Switch Wiring

If the engine won't crank or the engine stalls when put in gear, then this post might help.

The circuit below is a simplifed (and untangled) extract from the CBR250RR wiring diagram. It is much easier to see whats happening and how each of the signals relate to each other when isolated from the rest of the wiring.

[Image: CBR250RR_sidestand_clutch_neutral_starter_circuit.jpg]

STARTING THE BIKE
To start the bike, the starter relay must have a ground path to work. It can get this if the bike is in neutral. Otherwise, the sidestand must be up and the clutch in to start it when in gear. You can see these two paths on the circuit above.

RIDING THE BIKE
The CDI needs to see ground on the G/W wire, otherwise it will stop ignition events. That means the side stand must be in the up position. If the engine cuts out when put in gear, its probably the sidestand switch and associated circuit thats faulty.

If the clutch diode fails you can get weird results. Like the neutral light coming on with the side stand down and the clutch in, through to the neutral light not working. If you need to find it for replacement or testing, it's located on the wiring harness behind the air box.

Clutch Switch...
[Image: Clutch Switch.jpg]

joshtammi · 25/07/2010, 23:55

my bike doesnt cut out when the sidestand is left down? because sometimes i ride off without flicking it up, and nothing happens..

sir.b · 26/07/2010, 00:00

That means your side stand switch isn't working.

Justin.

Skellyton · 26/07/2010, 08:10

Hmm where can i find this side stand switch because iv done the same as josh.

banana.logic · 26/07/2010, 08:19

If you go and look at your bike you will see the side stand, from there I can only imagine it is quite simple to find the wires and whatnot associated with a switch.

Skellyton · 26/07/2010, 10:01

yeah i haven't even bothered to check, ill take a look tomorrow.

sir.b · 26/07/2010, 10:08

Justin.

zul_cbr · 26/09/2010, 14:19

Hi..!

I owned CBR400RR NC29, but I guess the sidestand wiring is just the same as CBR250RR MC22.

The problem is, when the engine is hot after a long-distance ride, the neutral light won't coming in although the gear is in N position. Sometimes, it would coming in if I slant the bike a bit to the left (at seating position). I have changed the diode but the problem still persist. I still can start the bike with the clutch in during the problem occurs.

The problem not occurs in short ride (or engine not warm enough). Anyone could help me with the problem ?

Eclipze · 26/09/2010, 14:35

The circuit for the J and K models is a little different, but for the L, N and R it looks the same as the CBR250's. Your problem could be the neutral switch itself or the wire between the diode and the switch (including the connector).

zul_cbr · 26/09/2010, 16:15

(26/09/2010 14:35)Eclipze Wrote: The circuit for the J and K models is a little different, but for the L, N and R it looks the same as the CBR250's. Your problem could be the neutral switch itself or the wire between the diode and the switch (including the connector).

Thanks for replying mate!

yeah, it seems like an intermittent connection. but, why it occurs after a long-distance ride ? I never had any problem at short-distance.