Need Help: Gear box problem -bike shifts to neutral on going over 4000 RPM - Honda Motorcycles -
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post #1 of 3 Old 11-27-2008, 1:40 AM Thread Starter
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Need Help: Gear box problem -bike shifts to neutral on going over 4000 RPM

Hi guys, i am new to this cummunity. i recently bought a 99 CBR 919. the bike is amazing but there is just one problem that when the bike is in second gear and as it reaches 4000 RPM the gear automatically shifts to neutral. I showed it the dealer who said that that the teeths of 2nd gear components have worn out thats why on higher RPM it shifts to neutral. he said this is because the previuos owner wheelied it for long distances. Anyway the bike is otherwise great and i dont want it's engine to be opened (like head covers, master cylinder). the dealer said that the gear component can be changed without opening the the whole engine (i.e head cover, master cylinders, crank etc.). Is he right and should i proceed with the repairs. thanks a lot in advance for any help
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post #2 of 3 Old 11-27-2008, 3:07 AM
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Re: Need Help: Gear box problem -bike shifts to neutral on going over 4000 RPM

It's not the teeth that wear.
The gears have "dogs" that lock them to an adjacent gear to drive the shaft.
The dogs become rounded and no longer stay locked together under load.
It's nothing to do with wheelies, just bad shifting. It's most common on second because first to second is the widest shift and slams in the hardest. The lower gears also see higher revs and are used a lot more often than the higher gears.

Does it happen regardless of whether you've shifted up or down to second?
If you shift to second but don't release the shift lever (normal pressure - don't force the lever) does it stay in second while you hold it in?

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post #3 of 3 Old 11-27-2008, 8:38 AM
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Re: Need Help: Gear box problem -bike shifts to neutral on going over 4000 RPM

I suspect some power shifting was in it's past and as bladeracer says, rounded the dogs on the gears.
Does it also come out only with a lot of throttle or even on light throttle?
How about going back to the previous owner for help if you just got it. He obviously was aware of the issue.
To answer your question, yes it can be repaired without taking the top of the engine apart but the cases have to be split to get at the transmission.
You have really no choice but to repair.
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