Buying used 4stroke what to look for?
  • Stonezcrazy
    Posts: 6
    I was looking at a 02yzf250 and it does not run. The owner said it has no compression and the top end needs to be re built
    I am new to repairing bikes especially 4 strokes. I use to ride 2 strokes as a kid but wanted something to maybe work on with my boy and have a decent bike after the rebuild. Can anyone tell me what to look for if I look at this 02 250 so that I don't end up picking up a giant paperweight? Any guidance would be appreciated. Thanks.
  • markyrocks
    Posts: 1,297
    I would say if it has zero compression then its most likely a valve issue. As far as what to look for.... short of ripping it apart, I'd say make sure engine spins smoothly. But you have to be prepared for the worst if you do buy this and it needs new everything and machineing ect you may end up spending over 1500$ on a bike that barely worth that much. If you get it for less than 500$ you can always get it find out the issues if it too much you can part it out.
  • Stonezcrazy
    Posts: 6
    Thanks so much for the info. What would be the best way to make sure the engine spins smoothly?
  • markyrocks
    Posts: 1,297
    Pressing kick start lever down
  • Maple Leaf MXMaple Leaf MX
    Posts: 12,825
    Slowly cranking the bike over and put ur head right down by the cylinder and listen for any weird engine noises or transmission noises.
    Expect to die whenever but dream to live forever

    ..the good times on the old DR board will never be back! RIP!
  • markyrocks
    Posts: 1,297
    Maple your good at slowly cranking stuff then putting your head right down in places.
  • Maple Leaf MXMaple Leaf MX
    Posts: 12,825
    Wheres the clap emoji when i need it
    Expect to die whenever but dream to live forever

    ..the good times on the old DR board will never be back! RIP!
  • gearman
    Posts: 119
    I would never pay more than $200 for a 2002 YZF bike that is not running. Non running bikes are usually cans of worms, besides the motor issues, the suspension seals, wheel and linkage bearings etc. are likely shot too. Even if you do your own wrenching you could spend easily over $1500 fixing it. Just find a good used one with low hours and get it, even if you have to travel.  
  • markyrocks
    Posts: 1,297
    In all seriousness, who would sell a bike blown up or not for 200$? You could get that much just selling the wheels an tires....
  • gearman
    Posts: 119

    "In all seriousness", people who just want to clean up their garages, and don't have time messing with selling crap or can't fix the bikes. If you don't do your wrenching $40-50/hour shop rate can add up quick. 

  • pojp58pojp58
    Posts: 10,599
    It would be a "GREAT" learning experience imo. If you get it for real cheap.
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  • TheFishGuyTheFishGuy
    Posts: 2,111
    Regardless, an 02 yz250 is a PAIN to start, even when it's fairly tuned and in okay running shape. I wouldnt get a yz 4 stroke in that year ever again.
    ********************
    Tim
    Arizona
    (2007 KTM 300xc)
    (1977 Yamaha dt-250 MINT condition!)
    (2002 Yamaha TTR-125 Wife's bike)
    Proud member of ArizonaTrailRiders.org

    "Live every week, like it's Shark Week"

    "I wanna make bank, bro!... I wanna drive a Range!"

    image
  • markyrocks
    Posts: 1,297
    That what year mine is.... starts 2-3 kicks cold. Just piston needs to be in proper position before you kick it.

    @ gearman... please don't patronize me ill send maple after you.
  • Maple Leaf MXMaple Leaf MX
    Posts: 12,825
    I thought u were done trolling?
    Expect to die whenever but dream to live forever

    ..the good times on the old DR board will never be back! RIP!
  • pojp58pojp58
    Posts: 10,599
    If you put an Hot Cam exhaust cam in it you eliminate the decompression lever and it makes a big difference.
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  • Stonezcrazy
    Posts: 6
    Well I can get the bike for $375. Owner said it needs a cylinder head so I assume everything in it as well.
  • Stonezcrazy
    Posts: 6
    I'm sorry the bike is a 2003 not 2002 if that makes a difference.
  • markyrocks
    Posts: 1,297
    It does 03 comes stock with auto decompression exhaust valve ;-)
  • pojp58pojp58
    Posts: 10,599
    Its going to have to be your own judgement call.

    Will he let you take the top off and look first?
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  • iCool247iCool247
    Posts: 1,221
    I would just try and find a 250 2t that needs a rebuild if you're looking for a project for you and your son. 2t rebuilds = CHEAPER 
    image
    "If you can't win, wreck someone who can"- Ricky Carmichael 2011
  • ballane89
    Posts: 16
    I agree with icool
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