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  • Rebuilding an engine ?

    If an engine has bugger all compression (i.e kaput) Is it possible to rebuild it to get it running again instead of having to buy a whole new (or secondhand reconditioned ) motor for it ???

  • #2
    of course it is.
    much cheaper also.
    Your not talking about your new hyo are you?

    Reconditioned = someone else rebuilding the motor.
    IM ALWAYS ON THE EDGE, ITS ONLY THE SHARPNESS THAT VARYS

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    • #3
      tricky pick a price $1500 -$4000 sometimes it's cheaper to replace with good s hand motors need more info

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      • #4
        some engines its easier than others

        steel bores are easiest and most options, the standard cylinder barrel is an aluminium barrel with a steel sleeve a couple of mm thick pressed into it.

        the steel sleeve can be lightly honed/cross hatched and reassembled with just new piston rings on the old pistons if everything is still close enough to specification- just labour plus gaskets and rings

        steel bores can also be rebored to take oversize pistons which is same cost as above plus the reboring and new pistons. for instance, i scrunched a piston in my rz which scored the barrel.. the barrel diameter had to machined out 1.00mm to clean up the damage. pistons were available in 0.25mm increments, which basically means you can oversize 0.25, 0.5, 0.75, 1.00, 1.25... to maximise service life you want to oversize as little as necessary.

        a lot of modern sportbikes have cylinder bores which are coated with low friction alloys or ceramics- you can re-ring these but cannot rebore them. i think you can resleeve them but is relatively expensive.

        also some motors lend themselves to being easier to pull to bits and put back together.
        Originally posted by Bendito
        If we get to a stop and we are missing a dozen bikes and you are last, it was your fault. Don't be that guy. No one likes that guy.

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        • #5
          No no not the Hyo LOL. If that engine went kaput I has warranty hehe. This is for the 1990 kwaka bunky I got If its possible to rebuild then I would love to have a go at doing it myself. I just wanted to make sure it wasnt an exercise in futility that was never gonna work again but as long as its possible then I have silver lining

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          • #6
            What bike, what motor?

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            • #7
              have a go a the very lest you will learn heaps

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              • #8
                And get your Son to help you, it'll be a good experience and might help him if he gets really interested in it.

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                • #9
                  Originally posted by Desmogod View Post
                  What bike, what motor?
                  Its a 1990 ZZR 250. With a 4 stroke, 2 cyl liquid cooled engine. My youngest has been helping me pull it apart so far coz he is a little motorhead. the eldest is not so interested but has come and watched once or twice during the pulling apart process (which is still going >.<) lol

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                  • #10
                    Easy motor to rebuild, cheap parts, simple construction.
                    I'd rebuild.
                    Zero compression though?
                    Could hold some lovely surprises!

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                    • #11
                      how many cylinders are low on compression? done any test to work out if its rings/bores or valves/seats causing the problem?

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                      • #12
                        Awesomesauce Knowing my luck I will end up with bits left over hehe But that only means Ive put it back together properly right ?? hehe Tho it may look like Picasso designed it

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                        • #13
                          sleeves ( which are actually called liners ) can be a costly thing depending on the material used... very expensive.. but give it a go. its fun. im doing a 4cyl 1.8ltr engine myself... so keep us posted how u go.

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                          • #14
                            1. Remove from frame
                            2. Realise you forgot to unplug everything/drain fluids, etc
                            3. Clean floor up,then stick on bench
                            4. Remove parts according to manual
                            5. Ask for help

                            Come fix mine whilst your at it :S
                            Success is nothing more then taking advantage of an opportunity.

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                            • #15
                              .. also if the compression is almost non-existant it can point to burnt or faulty valves, a lot easier job as you remove the head, get shop to fix & then replace (you could sort the valves yaself but it takes a few specialised tools to do easily).
                              .. and thats Racer # 193 to y'all; my fabulous sponsors (who all do good shit) are: Graeme Fleming IT Consultants, Vision Image, Pacific Safety Wear, Excess Power Equipment, Pro Photo Booth

                              .. and according to Sean'o: 'get the Kwaka (never thought i would say that!)'

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