gsx750es second gear issue

[B2BC]

hi all will be using my b12 motor in my 750 and putting into a slingshot frame

ill be putting original engine back in 

the original engine has a issue with second gear

under heavy load it jumps out of second friggin scary when not expecting it to do it

what the worse case split cases remove gearbox?

or can it be done without spitting cases ie remove all side cases clutch sump and going in that way

what could be the issue worn 2nd gear fork selector ect

[Gixer1460]

Well known problem and yes its a case split but you don't have to strip the top end - just drop oil, take clutch out as there are some cross the joint tabs to remove, remove sump and then you can remove the bottom case - maybe some bits i've forgotten! Could be the selector but more likely the gear dogs have rounded off and as they are paired with 5th they'll be usually worn as well! Gears ain't cheap but will be uprated 'M' parts which are undercut. The old gears can be saved by being undercut - best they all get done - makes them fairly bulletproof and positive selection!