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How to free up a stuck motor on a CBR250RR

Discussion in 'Honda 250cc In-line 4's' started by kiffsta, Feb 24, 2015.

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  1. kiffsta

    kiffsta Senior Member

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    we might be able to come to a deal, however I don't have access to a courier company and normal postage would be a killer to the US, if you arrange a courier then Im sure we can do something.
     
    kiffsta, Feb 28, 2015
    #21
  2. U_B_WARE

    U_B_WARE Well-Known Member

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    if you need a hand with a courier company, i got access to good rates with DHL, just would need to know a size and a weight for it.
     
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    U_B_WARE, Feb 28, 2015
    #22
  3. thebeefsalad

    thebeefsalad Well-Known Member

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    While we're at it...any idea what kind of shape the transmission is in?

    Awesome, thanks!
     
    thebeefsalad, Feb 28, 2015
    #23
  4. Joker

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

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    Hmm. Assuming the pistons are seized due to water/moisture I think the most effective thing would be to apply heat. Maybe take the head off (or not, if your oven is big enough!) and put the rest in the oven. once warm, a tap with a mallet and a piece of wood should free up the pistons. I'm imagining hot oil works because of the heat, I don't think the oil itself would do much (because if it did, it would have to get around the piston meaning there are already gaps and hence things wouldn't be fully siezed).

    Like a rusted bolt adding just enough heat to crack it should do the trick. I personally wouldn't be trying any chemicals, unless you're planning a full rebuild they're likely to leave residue etc which could cause you start-up issues.
     
    Joker, Feb 28, 2015
    #24
  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    I agree Stu, it is the heat from the oil and the fact that Olive oil holds its heat better than some others and is very thin when hot that helps (don't forget the chips, ha ha).
     
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    Murdo, Feb 28, 2015
    #25
  6. Joker

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

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    You just do it for the chips, don't you Murdo. Be honest. I would.
     
    Joker, Feb 28, 2015
    #26
  7. Mclaren

    Mclaren Well-Known Member Contributing Member

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    I think the oil helps more but mainly as the heat helps loosen the piston and the oil can work it way around and help lube the barrel but either are great ideas as long as the missus dont know lol
     
    Mclaren, Feb 28, 2015
    #27
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