New Owner Y2K Blaster time to get dirt

Discussion in 'Full Rebuilds' started by TypicalGuy, Apr 25, 2022.

  1. TypicalGuy

    TypicalGuy Member

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    Well this is what I have to start with. Hope I didn't bite off more than I can chew. Anything you see feel free to comment all help is welcomed ☺️ 20220425_151538.jpg 20220425_151538.jpg 20220425_152409.jpg 20220425_151901.jpg
     
  2. TypicalGuy

    TypicalGuy Member

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    Started taking it apart to replace what looks bad. It ran but not very well. Went through all the gears, rear brakes don't work, front are very weak, clutch grabs hard. 20220425_151527.jpg 20220425_151447.jpg
     

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  3. TypicalGuy

    TypicalGuy Member

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    This hose was connected to the Carb 20220425_151401.jpg
     

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  4. TypicalGuy

    TypicalGuy Member

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    Well I pulled the head off cause I saw gasket maker and I'm not sure what to make of it
    Looks like a newer piston and rod maybe the did the crank as well???
     
  5. TypicalGuy

    TypicalGuy Member

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  6. TypicalGuy

    TypicalGuy Member

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  7. TypicalGuy

    TypicalGuy Member

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    Here's what I have.
    Ps I didn't mean to upload 3x
     
  8. TypicalGuy

    TypicalGuy Member

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    Should the piston rod have this much room to move side to side like this?
    There is no up and down movement of the rod to the crank and a little side to side like I've seen on YouTube rebuilds
     
  9. TypicalGuy

    TypicalGuy Member

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  10. CycleTech

    CycleTech Member

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    Everything is wrong< Chinese Ebay cylinder, Junk Wiseco Crank, RVT used throughout. That entire motor needs to come completely apart. DO NOT watch YouTube to learn how to rebuild motors as 95% of those clowns are full of BS. You can't inspect a crank shaft with your hands and eyes. You need mag base dial indicators to inspect rod bearing Raidel deflection measurement and runout and feeler gauges to inspect side thrust washer clearance. That piston is like new but look at all the burn pattern below the second Ring?! Thats perfect indication that the piston had excessive blow bye because the rings never seated and sealed to the cylinder because the bore finish is not correct, and the piston fitment is most likely wrong. That motor would have shortly blown up caused by many factors involving junk parts and "TERRABLE" mechanic skills. You have a Bitten off more than you can chew here, I'm sure. Unless you go get a factory service manual and go out and buy all the necessary special measuring tools (To measure and compare to service specs) and special tools to build engines "Correctly" along with having someone check your work then I would Think twice before spending money just to have more headaches in the end. I rebuild and modify these and all other Quad and MX motors daily in my shop and I deal with this ALL the time with customers just like yourself and SO many people throw money away trying to build a motor and then bring it to us and have to have it done all over again "Properly". You Tube will never replace decades of study and experience. Read Books and learn by the engineers over in Japan not some Wanabee on You tube! Service manual is the Bible! Period! Those Ebay China Cylinders are good for one thing... Peeling potatoes (Sharp as razers port windows with no chamfering!) LOL!
     
    Last edited: Apr 28, 2022
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  11. TypicalGuy

    TypicalGuy Member

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    guess I have some work ahead of me. I thought weisco was good ? I'll get a topend kit if I have to, what do you recommend? I appreciate the help
     
  12. CycleTech

    CycleTech Member

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    Recommend All OEM (or Japanese Equivalent) Components for entire motor with the exception of a Wiseco "Piston". OEM Gaskets (or Japanese or USA Equivalent). The old style "Black Con Rod" Wiseco cranks are junk. Find a clean OEM Crank and have it rebuilt "With Japanese parts" and also find a good OEM Cylinder (close to stock bore size as possible) and have it Bored & Honed matched to a fresh Piston. Main Bearings and main seals. New reeds. This is the bare minimum in my book. If you need any of these special services like crank rebuilt and or cylinder work let me know if you don't already have someone. My shop does all this type of work. Good Luck
     
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  13. TypicalGuy

    TypicalGuy Member

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    Checked my ring gaps like suggested and you were correct. 0.19in when they should be 0.00 20220429_113326.jpg 8-0.014
     
  14. TypicalGuy

    TypicalGuy Member

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    So I'm guessing I'll need a whole new piston? I'll go to my local shop and ask them to match one for me.
     
  15. TypicalGuy

    TypicalGuy Member

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    Well my local shop just wants to order a new cylinder and piston ( something I can do myself ).
    So I'm having a hard time finding a cylinder that's not Chinese made and OEM doesn't seem to be available from online stores. Does anyone know where to find a quality cylinder?
     
  16. CycleTech

    CycleTech Member

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    You buy a good used one as close to stock bore as possible(66mm) and send it off to a shop (like mine) to get bored and honed matched to a new Oversized piston. The cylinder gets measured and depending on how much material needs to be removed(bored) from the bore to get right then the machinist orders the piston and when it arrives the cylinder is then bored and honed to match that "Exact" Piston. This IS the only correct way to do it as there is OEM cylinders available from the Manufacture but Very expensive in comparison and are on backorder everywhere.
     
  17. CycleTech

    CycleTech Member

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    Also wanted to mention that you are incorrect with ring gap. first off you only measure the outer (smaller) gap and the specs are .008"-.014" and the larger the oversize piston the closer to the larger number you want. No piston ring is set at .000" clearance as it's there for thermal expansion of the ring and without its bad things happen. All those cheap Chinese kits on Ebay, Amazon or wherever it's sold from are complete sh*t on many levels.
     
  18. Larry's Shee

    Larry's Shee Active Member Technician

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    Don’t waste your money putting a new piston in a worn out hole.

    Here’s how you do it PROPERLY !!
    1. Have cylinder professionally measured, to determine proper oversized piston needed.

    2. Buy piston

    3. Machine shop bores and hones to fit THAT piston.

    4. NO CHINA PARTS !! Buy once, cry once
     
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  19. TypicalGuy

    TypicalGuy Member

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    That's what I had but my picture cut off my text for whatever reason.
    I did find OEM refurbished jug and piston on Ebay for $400.
     
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  20. TypicalGuy

    TypicalGuy Member

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    There's still hope for project Y2K, whoever deleted the oil injection did that correctly ! 20220503_155348.jpg
     

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