Motorcycle Questions? Ask a Mechanic.
HI and thank you for your question.
I am not familiar with the term "rooted" so I can't comment on that.
What I can comment on is speculation on the damage. It is hurt. Since it is only happening in 1 particular gear, it is an internal problem and not a linkage problem, meaning the cases are going to have to be split to repair it. Similarly I cannot know exactly what it is going to take to fix it, parts wise or cost wise because I don't know how bad the damage is internally. I can give you some information that will give you an idea of what it could cost. The other thing I don't know is how prices compare in Oz to the US.
I took a shot gun approach to estimating the parts pricing and it came out to about $325. There could be some incidentals needed that would add to that, or you could include a new piston and rings at this time since the engine is apart. If you just calculate parts to fix the transmission, you should be under $400 USD with on line pricing. An educated guess on labor to do a transmission repair if you take the entire ATV into the shop would probably be around 8 hrs. Since it is not a warranty repair, the shop can charge whatever they want for labor. Just because flat rate time for a job is a certain # ***** hrs, it does not mean the dealer is forced to charge that. They can charge more or less as they see fit. If you are going to pay someone else to do the job for you, ask them questions about how they calculate labor pricing.
If you have any more questions, feel free to ask.