As you only had a few posts, I went back through and saw you did a bike swap. I know its a pain when shit like this happen, even more so because a bike swap was involved. But when it happened to me I got the police involved, if the gearbox had locked up when I was on the motorway I would have been a jam stain.
If it is just the return spring, then according to the following links its easy to replace (it just under the shifter cover on the l/h side) and prove if its that or something more serious -
- http://www.yamahafz1oa.com/forum/showthr...ter+spring
Tension Spring Part# 90506-14002-00
[update]
Ninja'd buy ND, It only takes a 10-15mins to remove the shifter cover and check the detent (return) spring, if that's in place that its "return the bike and demand your DRZ400 and what ever cash you paid back. At the end of the day you could have and there is still the risk of having a serious accident due to the gearbox locking up.
If it is just the return spring, then according to the following links its easy to replace (it just under the shifter cover on the l/h side) and prove if its that or something more serious -
- http://www.yamahafz1oa.com/forum/showthr...ter+spring
Tension Spring Part# 90506-14002-00
[update]
Ninja'd buy ND, It only takes a 10-15mins to remove the shifter cover and check the detent (return) spring, if that's in place that its "return the bike and demand your DRZ400 and what ever cash you paid back. At the end of the day you could have and there is still the risk of having a serious accident due to the gearbox locking up.