It depends on your knowledge, and the tools you have. Replacing the crank seals is about as far as you can go in a sled engine. If you have decent knowledge (and a shop manual for all the torque specs) and all the nessacery tools.....I'm guessing any where between 10 and 16 hrs for the "run of the mill" back yard mechanic like myself.
Are you talking doing the job yourself or taking it to a shop? Tough call on the shop because it depends on who works on it. I think they have set time rates for jobs though. At least they do for regular automotive tasks.
water pump is easy once you are down to the crank so the thing is how long will it take to get to the crank and back, if i did it and i've done a couple motors and counting pulling them out of a jetski, it took me 3 hours, but thats on some thing i know, on yours about 4-5
It really depends if you want to split the crankcase or not. Some recommend that you do but you can get by without splitting on some. Clutch pulling tools and flywheel puller and without splitting case it will still take a good 4 hours I would guess.
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