CBR 600F4 1999 - 2000 Honda CBR 600F4 Forum

Gearbox issue on F4, engine swap?

Old 07-11-2019, 11:22 AM
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Default Gearbox issue on F4, engine swap?

Hello all! I'm new to the forum, just bought a CBR but I have issues with it

I bought it last month, a 1999 F4 with only 20k miles on it, some paint work on it. It worked great except from time to time losing 2nd gear when upshifting without clutch.

Just last weekend on an accelleration it was hesitating between 2nd and 3rd by itself, then I heard a big clacking noise and lost all power, on all gears except 5th. On all gears even neutral, i get a sound at each rotation where the gear seems to slip, with some kind of friction. On neutral the same thing happens, it moves the rear wheel a little bit also. I've made a video i'll try to upload it.

Strangely the 5th gear is fine. So I suspect there's something wrong in the gears or selection forks. I was thinking of doing the work myself but it seems like a massive task to open the crankcase. There's not many tutorials either since it seems that honda gearboxes never fail!

Now I was also thinking of swapping another engine, but it seems the F4 is fairly rare, it was built just for a year here (France).

There are plenty of F4i engines available, and also F3 engines. Here the Hornet 600 was a big hit so I can find a hornet engine PC25, which is a F3 engine, for like 300$, instead of 1000$ for a f4.

So the question is, can I swap a f3 or f4i on my f4 with minimal adaptation? or should I be patient and look for a f4 engine? or is it not that hard to open the gearbox?


Old 07-11-2019, 11:49 AM
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F3: No, not a chance.
F4I: Maybe....
Old 07-15-2019, 03:14 PM
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well at least I found the reason for my problems, there are some gears parts in the oil pan.

Should I look for damage somewhere else than on the gearbox?

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