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Rebuilding 2kr FZR engine

Discussion in 'Yamaha 250cc In-Line 4's' started by risky, Feb 7, 2014.

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  1. risky

    risky risky

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    yep, seen that and emailed to see if can get head gasket only.
     
    risky, Feb 8, 2014
    #21
  2. kiffsta

    kiffsta Senior Member

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    Won't you need abase gasket as well ?


    Sent from my iPhone using Tapatalk
     
    kiffsta, Feb 9, 2014
    #22
  3. risky

    risky risky

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    already got a base gasket on way.
     
    risky, Feb 9, 2014
    #23
  4. risky

    risky risky

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    for your parts contact frankston yamaha before you buy off ebay. just got genuine head gasket with postage for 36 bucks.
     
    • Like Like x 3
    risky, Feb 11, 2014
    #24
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    that's a nice price
     
    ruckusman, Feb 11, 2014
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  6. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    ruckusman, Feb 12, 2014
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  7. risky

    risky risky

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    interesting.
     
    risky, Feb 12, 2014
    #27
  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I was considering pulling my engine down to implement this fix but didn't find reasonably priced parts to refresh the rest of the engine till after I'd refitted it.

    It looks to be an easy job to do
     
    ruckusman, Feb 12, 2014
    #28
  9. risky

    risky risky

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    have seen car cranks fitted with plugs to facilitate machining.if not broken why do? more like crud caught in oilways and crank not cleaned properly.the plug should be staked and from the article it appears the plug comes loose.same effect would apply if journal out of round or excessive clearance.
     
    risky, Feb 12, 2014
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  10. risky

    risky risky

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    engine problem is number 2 cylinder. much oil. other ports were dry.had to remove fairings, and exhaust to change oil filter hf145.cannot imagine too many being changed.
     
    risky, Feb 12, 2014
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    It was more of a preventative measure because of a known point of failure, but I decided that my engine is well maintained with good compression etc so left it be.
     
    ruckusman, Feb 12, 2014
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  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    it's a true PITA but gladly the filters are cheap
     
    ruckusman, Feb 12, 2014
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  13. risky

    risky risky

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    parts from china arrived today and look to be good quality.if i rebuild another motor will check with frankston yamaha first.
     
    risky, Feb 15, 2014
    #33
  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    That's quick delivery, anything from China usually takes several weeks to arrive for me...

    I'm interested to see a pic of cylinders with the head removed if you're up to documenting the process

    Are you going to ball hone the cylinders?
     
    ruckusman, Feb 15, 2014
    #34
  15. risky

    risky risky

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    when i strip the motor down i will decide. my engine hones will not fit in these cylinders which are roughly 40 mmm. might use some 1000 wet and dry and wrap around toilet roll and rotate and move up and down at same time.would like a small ball hone but doubt if expense to buy is justified. rings are very narrow and oil rings are 3 piece, top ring and oil rings chrome faced and black 2nd compression ring.bearings supplied are white metal and well made. valve stem seals are tiny but push on to valve guides. stem size looks roughly 2 mm.
     
    risky, Feb 15, 2014
    #35
  16. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    if you used 320 - 400 to remove the mechanical polishing (it's not actually glazing - technically) followed by 1000 you may be able to replicate plateau honing which I've read good things about
     
    ruckusman, Feb 15, 2014
    #36
  17. risky

    risky risky

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    motorbaby 2012 on ebay.com has head and base gasket for usa 25.90. have ordered a set to compare to genuine yamaha.
     
    risky, Feb 22, 2014
    #37
  18. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I've got a crazy idea in my head - a big bore with the same stroke to get into the ~1.5:1 bore to stroke ratio or larger

    Any chance of taking measurements once you have the cylinder head removed of the space between cylinders.
     
    ruckusman, Feb 22, 2014
    #38
  19. Joker

    Joker See "about me" for contact details. Contributing Member

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    try findapart.com.au. Wreckers ring you up if they have it in stock.
     
    Joker, Feb 22, 2014
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  20. risky

    risky risky

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    space between cylinders is not much.certain i have a spare set of barrells somewhere so will check them. ordered a spare head gasket set from china.
     
    risky, Feb 22, 2014
    #40
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