Ninja 300 False Netural/Shifting Issue

[Greg Sheldon]

Installed the Factory Pro shifter kit and it seems to have solved the problem. Ran the bike pretty hard at Harris Hill today and it did not down shift or pop out of gear one time. Crossing my fingers that this problem is gone for good.

[Tommy Hendricks]

Apart from doing the factory pro shift kit mod, anyone actually go a step further and undercut the gears to see if that took care of the problem for good? Pretty sure that's the route you'd have to go to really take care of these transmission issues.

[Greg Sheldon]

Is undercutting the gears legal for you guys? I'm just doing track days at H2R and not competing, so it really doesn't concern me. I was pretty skeptical that the heavier spring would fix this, but so far it really does seem to work.

[Tommy Hendricks]

^I don't see how doing a mod that will make a bike much safer to ride/won't give you any advantage, would be illegal. I'm going to have my transmission sent out over the winter to have them undercut the gears to prevent the popping out of gear issue I've had (different bike).

Anyone else care to chime in on the legal matter for this reason? (preferably one of the higher ups on the B.O.D.)

[Scott Finning]

While I can't speak to the 300 I do know I had the same issue with my 250.
I tried adjusting the linkage and it help a little but for me the issue seemed to be a vague(not positive) shifts and the missed shifts seemed to be mainly a matter of a more firm pressure on the shifter.. The false neutrals is what bugged me the most though.. I decided to change the detent spring.. Instead of the Factory Pro I when to a local fastener shop and bought some hardened springs with a stiffer ratio than stock.. Night and day difference.. very sharp shifts.. no more false neutrals and it never has jumped out of gear since..
I would bet my money the issue in the 300's is the same.. a weak detent that won't hold the shift drum in place when it's being pushed hard... fix that and your problems likely will go away..IMHO I think Greg is correct..

[Brad Thomas]

The shift kit will most likely fix the problem unless there is already transmission damage.
300
http://www.factorypro.com/Prod_Pages/prodk35_ex300.html

250 - Special THANKS to Mitchell Klein for helping me find this modification!
http://www.factorypro.com/Prod_Pages/prodk04.html

The 250 shift spring takes about 3 minutes to replace.

Easiest, most effective modification I have ever done.

Look at the difference in the spring length.