Neutral Switch???

Curious as to the exact purpose of this baby. Am I correct to think that this will lower the rev limit for a missed 1 to 2 shift or prevent over reving while in neutral. I looked in the manual and it grounds one circuit while in neutral but is an open circuit while in gear. The manual does not explain the reason it's installed. This is on a 2001 YZ426.

Thanks

PK

I’m pretty sure that this sensor, on US models, changes the timing depending on what gear you are in (I remember reading this in a few magazine test articles). On my ’00 it has a contact point with the gear selector for all 5 gears and neutral.

On older US bikes this sensor didn’t do anything. I think on ’98 & ’99 European models this sensor limited rpm while in neutral so the bike could pass the FIM noise standard.

I would be surprised if the manual is accurate in this case, or maybe I wouldn’t. This sensor on pre-2000 models had contacts for all gears yet effectively did nothing. Maybe they still haven’t gotten around to plugging the thing in.

That's what I initially thought, or hoped, but I think it is like an appendix, with no useful purpose. I have always cut the harness off, with no apparent ill effect. Terrycable still sells an aluminum plug to replace it.

Originally posted by Hick:

I’m pretty sure that this sensor, on US models, changes the timing depending on what gear you are in (I remember reading this in a few magazine test articles).

The nuetral switch is to prevent over reving in nuetral. When in nuetral the timing is change to almost perfect TDC at idle.

In nuetral the rev limiter is set to around 8000 rpm's.

I must say that the timing does advance in nuetral once you stab it but not to the same degree as it does in gear. I would say nuetral is not the gear to be tuning your bike in because of this.

Jason

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