My bike jumps out of 2nd gear when giving it the full beans. After a bit of research it seems to be a very common problem with these bikes. What is the normal problem and how is it normally resolved?

Thanks guys! I promise I'll contribute to the forum soon!!!!

 

If you crank it over 5000 rpm and it jumps back into neutral then 2nd and 6th gear is shot, and the shift forks and drum also take a beating.

 

Yeah you'll have to pull the engine & split the cases to get to the transmission parts too which pretty much sucks. Mine used to pop out of second sometimes when shifting, but I was able to save it by installing the Factory Pro shift kit before it did enough damage to destroy anything. Might be worth a try to see if it helps, but I'm not sure it will.

I've seen transmission parts on Ebay for cheap if you end up needing to replace the gears/forks/drum. Usually can find all the guts for the transmission for under $200.

 

Why would 6th gear be shot as well? I'm guessing it is just a case of drop the engine and strip it upside down? Judging by the hermatite, the bottom end has been apart before. So far it has only skipped once and that was going from red line in 1st to 2nd. Have you got a link to the shift kit also? Thanks guys!

 

Also, the part numbers don't seem to match, but has anyone tried a gearbox from an f2 or f3? They seem to be more common on eBay atm!

 

If its only popped out occasionally when shifting into 2nd at high rpm I would try the shift kit first. That's what mine used to do.. when accelerating hard shifting close to or at redline it missed 2nd and popped into neutral.

The part number is SHFT-PRO-HON-1

I'm pretty sure this is where I got mine from, but it's been awhile..

$74.95 - 87-90 Honda CBR600F Factory Pro Shift Kit | StarCycle, USA

The spring is a real PITA to install, but this is one of the best mods I have made to my bike. I've never missed a shift once since installing it.

 

Am I correct in thinking that if it pops out at around 5000rpm it will be the selector arm etc, probably caused by it popping out too much at high revs due to crappy spring and actuator arm?

I'm waiting for the exchange rate to suit me best so I can get it sent to the UK !

 

Yeah the spring & detent arm I believe were not quite strong enough which would lead to missing shifts. When the transmission pops out of gear it can hit the shift fork & other gears and eventually bend the shift fork & round off the gears. Once the internals get damaged bad enough from missed shifts you don't really have any other option but to replace parts.

In your case I would probably try the shift kit first since it's not nearly as expensive & time consuming as replacing hard parts in the transmission.

 

I will definitely get it ordered, as mentioned prior the bottom end of my bike has been ripped apart before, so I can only guess it was due to that problem. I'll ride it like a pensioner until I get the shift kit and see where I get from there !

 

was about $45 on factory pro website, came to £55 delivered to the uk