That depends on your level of mechanical competence. I could have the bottom end apart, another crank in it, resealed, and ready to put the top end back on in about 4 hours.
Using tools I already own, the cost is VERY minimal (some yamabond and new crank seals). The complexity is a 4 out of 10 (1 being changing a spark plug 10 being overhauling an automatic transmission) with relatively minimal special tooling required (snap ring pliers, impact screwdriver, flywheel remover, and crank puller are a must among other more basic tools) for a relatively invasive job.
The tooling required will cost less to purchase than a dealership will charge to disassemble and reassemble a bottom end.
If you go to
ATV Parts, ATV Tires, Dirt Bike Parts, Motocross Gear, Motorcycle parts and Motorcycle Tires | Rocky Mountain ATV/MC and search for these four parts numbers:
Tusk # 1177380002 <crank puller $59.99
Tusk # 1177390001 <case splitter $59.99
Tusk # 1179010002 <flywheel puller $9.99
Tusk # 1188510001 <clutch holding tool $15.99
K&L # 1145050001 <impact screwdriver $15.99
The case splitter is not ABSOLUTELY necessary as I've had luck in the past using a harmonic balancer puller and special long bolts from the hardware store to push the crank out of the case but the rest of the tool are really the correct ways to do the job at hand.
You'll have just under $200 in tools including shipping and have MOST of the necessary tools to do the job right (and as many times as you may need in the future)
Compare the costs of the tooling to the hourly labor rate of most dealerships at $85 an hour or the cost of purchasing a bottom end you know nothing about (expect about $200-$250 including shipping) the tools are a relative bargain...
