250 full rebuild

Discussion in 'Full Rebuilds' started by Deets, Sep 21, 2021.

  1. Deets

    Deets Member

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    I posted a few pics in some other threads. Figured I’d start a new one for our build. I bought my son a blaster for Christmas 2 years ago. C61E6002-BD41-4EFB-94AA-0458BB063DF1.jpeg

    Was 100% stock except for the painted plastics and graphics kit. Was actually blue originally.
     
  2. Deets

    Deets Member

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    Bought him new plastics and a toomy pipe for it last year thinking that would be all…. Wrong, you know how it is when you start tearing into things. So off to powder coat the frame and all the smalls went.
     
  3. Deets

    Deets Member

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    99A77B7D-ED4A-4F8E-AD78-58B211D625DE.jpeg


    Before…
     
  4. Deets

    Deets Member

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    7BC47B3E-E434-42BB-9B09-9803A349BCDE.jpeg EEB60ED6-5872-4F13-9873-A2EEE41FEAD8.jpeg

    + 4 round house swinger
    +3 A arms and stage 4 Elkas
     
  5. Deets

    Deets Member

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    C525A0A6-623A-4938-8EEE-557541AF3C00.jpeg

    Set of banshee front hubs and spindles, rear blaster sprocket and rotor powdered.
    CE4DCF92-AAFF-4F54-9ECE-3889D6201B00.jpeg

    Surfaced the rotor and removed powder.

    E4416B2C-557A-4CBA-901E-1F52106C4FE9.jpeg

    Front assemblies with fresh bearings and seals.
     
    Last edited: Sep 21, 2021
  6. Deets

    Deets Member

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    Engine - 240 vitos topend with a 3 mil stroker. I did the port work, pics to come tomorrow.
    I still need to check squish to see if the head needs milled or not.

    Also have a 33 PWK ordered from the boys at FAST.
     
  7. Deets

    Deets Member

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    The new skins…
     
  8. Deets

    Deets Member

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    Here is how it’s sittin currently.
     
  9. Deets

    Deets Member

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  10. Deets

    Deets Member

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    What squish are most of you guys running? I’d be comfortable with .035 to .040.
     
  11. Deets

    Deets Member

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    So I got the carb yesterday. Two things need addressed, the boot, and clutch cable clearance. The boot I’m sure I could make fit with a heat gun or hot water. Just not sure if it’s gunna be restrictive.
    The clutch cable clearance doesn’t look good. A35F390A-88F0-4FD4-8E64-BD6E66E4AE11.jpeg

    Would a new boot help with clutch clearance? Or am I gunna have to run a spacer?
     
  12. Deets

    Deets Member

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    Ended up ordering a UPP 34mm intake boot. I’ll see how that fits up then add a spacer or maybe bend the clutch lever a bit if it needs.
     
  13. Deets

    Deets Member

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    Bought a reed spacer, was about 3/8” thick. Way too much for me, put it in the mill and shaved it down to just under a 1/4”. Carb has plenty of clearance now.
    2F9280BB-14F8-42F8-B379-960610249CCB.jpeg 7D75C41B-612C-4794-AE06-C6861CF014F6.jpeg
     
  14. Deets

    Deets Member

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    Checked squish on the Vito stroked big bore with supplied gaskets and spacer. Was about .118”

    Took spacer out and only running one gasket now. Then shaved about .020” off the top of the jug. B8DE0EB2-D501-4CB9-B61F-FD08B23000B2.jpeg
     
  15. Deets

    Deets Member

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    Exhaust height was sitting at 85 degrees before I took spacers out. So, dropping the jug that far I gave the exhaust port a little raising.
    Squish ended up at .032”, perfect.
     
  16. Deets

    Deets Member

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    Gave her a little test run, power is awesome even though it needs broke in yet. It vibrates terribly though, so much so that it affects the bowl in the carb. If you rev it in neutral to about 6k, the bowl flutters and spits a lot of fuel out the overflow.
    Next step is to balance crank and piston.
    More to come later fellas.
     
  17. Deets

    Deets Member

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    Last pics
     
  18. Deets

    Deets Member

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    Welp, Ever seen one burn on the intake side…. Centered on the ring pin?
     
  19. Deets

    Deets Member

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    Head gasket was leaking a bit, normally that doesn’t cause a lean condition though.
     
  20. blasterBruce

    blasterBruce Member

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    Any air leak in a 2 stroke will cause a lean condition, some more worse than others depending on where and how severe the leak is, I see signs of 4 corner seize on that piston pictured, improper warm up prior to riding with an air leak will cause all kinds of piston wear/damage.
     

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