What to rebuild...used bike...

1995 YZ250 with minor up's, and the previous owner cannot pinpoint exactly when the last top end was done (apparently it was too fast and he didn't have it long enough to service).  Does not spew smoke at all, reasonably quiet and instant throttle response.  Chain is shot, but sprockets look okay.  Only leak is from the exhaust/head connection so have o-rings and springs on order.  Bars are kinda bent and throttle tube is cracked. 

My question is where to start the rebuilding?  I want to  have a starting point from here on out and avoid problems down the road so plan on throwing a few hundred at it along with an hour meter.    Top for sure, but should I include the bottom end?  other things I though of - swingarm/linkage bushings, reeds, shock seals, cables, air cleaner, sprocket/chain combo, clutch plates, wheel bearings?  Just not sure on what order to jump in or if any of it is really needed.

maybe you better to go just ride this bike for some days and look and feel

and after some days you found the most problems

chek all thincs

look for wear parts

low end on the 250 2t is strong but  chek for free play

top end-for sure you must get-and i think wiseco is the best .and clean the power valve- its for sure help your bike to be powerfull and responsiv 

swingarm/linkage -for sure you must put some frech grease and look for wear and get "pivot vorcs" kit or "all bals" the genuine is too expensive

cables- chek and get new if you found some wear-the motion pro -terminators is good and not exspensiv

air cleaner- better get 2-3 air filters and change often .and when get dirty wach all together

with sure you must chek clutch !!!!  on the rocy mauntin ATV / MC hawe good and not exspensive " TUSK  " for this old bike is ok

or just change only the metal plates and springs

put some new bar-the "longhorn  "-is good and the prise is ok and tusk kit for fat bars

chain- ride some thime with old and then change all toghetter chain and sprockets .  "primary drive" hawe good ,strong and not expensive kits

but first chek brake pads !! and disks

pads get EBC sintered "MXS"- i think is the name

and please put some frech DOT4 !!!! ....

....WOW ...YOU HAWE A LOT OF JOB ...GO..!! and after this you hawe good and strong 2 stroke!!!

i dont know englich

Can the previous owner tell you anything about the bike? I mean, has it ever been raced, previous work done, type of riding, storage time, etc? If he can't, there are a few things that can indicate what kind of treatment the bike has seen. First, look at the brake pads and rotors. Serious wear can indicate high mileage and/or abuse and poor maintenance. Wear marks on the frame are normal, but if they appear to be really severe that also indicates high mileage as do footpegs with really worn teeth. Fork tubes with visible slide marks are usually pretty worn, as well. Rim condition is also a good indicator of use and abuse, particularly if they are dented. If after checking the bike over you can conclude that the bike has seen its fair share of miles, I would take a conservative route and figure a complete engine teardown is in order. A used 2-stroke that has been subjected to several owners of varying skill and maintenance abilities and varying methods of premixing could have some serious issues lurking within its cases. At the least, I would do a top end teardown and have all clearances checked while the engine's open. Side-to-side play on the connecting rod might be all you'll need to check to find the need for lower end repair.