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Roto start 2 savage4.1

Discussion in 'Nitro Engines' started by Triplied, Aug 24, 2017.

  1. Triplied

    Triplied Member

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    Roto zip works with plug out but will only turn a few times with plug in no fuel lines are hooked up at this point do I need to put pressure on it or not???
     
  2. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Have you checked the one way bearing?
     
  3. Triplied

    Triplied Member

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    New to the hpi and not sure about bearing do I have to pull engine to see the bearings ??
     
  4. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Yes take yhe motor out and remove the roto start back plate the bearing is behind it on theend of the crank shaft. Just like its called it should only grab on way when bearing is turned. If it slips both ways its either bad or my just need cleaned with brake clean and reassembled.
     
  5. Jam Racing 1

    Jam Racing 1 NPTB Monitor, Master of the known universe.... HPISF Staff

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    put some red grease inside that 1 way bearing, it will work much smoother after you do, don't go wild with it, just a bit smeared around inside with a toothpick outa do the job.....
     
  6. Triplied

    Triplied Member

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    Thanks it's been in someone's basement for 6 years and I just got it ($160) and put batteries in and new fuel it started and ran one tank of fuel it will catch enough to start but probably got lucky...
     
  7. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Definitely soundslike the one way bearing probably why they put itup for 6 yrs. Nice buy any pics?
     
  8. Jam Racing 1

    Jam Racing 1 NPTB Monitor, Master of the known universe.... HPISF Staff

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    if it has been sitting that long it is time for a teardown and cleaning....
     
  9. Triplied

    Triplied Member

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    Took apart and found owb backwards it was sieved to shaft .. is crank solid from where the owb go to where clutch nut through the engine??
     
  10. Jam Racing 1

    Jam Racing 1 NPTB Monitor, Master of the known universe.... HPISF Staff

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    The crankshaft is one piece yes, it has the center bored out to allow fuel to get to through to the ports and is transferred into the cylinder in that way..... A couple of pics may help us see what you are referring to....
     
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  11. Triplied

    Triplied Member

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    IMG_1317.JPG If I hold the clutch and the shaft on the owb with the bearing on backwards can turn the shaft backwards ??
     
  12. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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  13. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    The part of ther shaft that the one way bearings slides onto has a channel cut into it to grab a pin when the engine is cranked. But when you spin the shaft where the one way bearing goes it'll spin but the crank wont.
     
  14. Triplied

    Triplied Member

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    So it's not broken?? I did get owb loosened up may need to get new owb any advice were to get one all shops around here are traxxas or have closed??
     
  15. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Ebay has some for a ok price
     
  16. Triplied

    Triplied Member

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    Pull start is the same bearing as roto bearing 1430??
     
  17. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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  18. Triplied

    Triplied Member

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    ThankYou !! ordered be here Thursday got time to clean up more....
     
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  19. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Post some pics when shes clean.
     
  20. Triplied

    Triplied Member

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    IMG_1321.JPG
     
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  21. NightFlier X4.6

    NightFlier X4.6 Well-Known Member

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    Very nice don't look to dirty with the body on.
     
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