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Thread: Big end banging

  1. #46
    apriliaforum prov-nov
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    Thank you. I have model 200 but nobody seems to ship to Greece (I have asked some). There are no custom or other taxes within Europe.


    Today I measured the diameter of the crankshaft. It is 31,95-32,00 when minimum in manual is 32,01mm.
    Last edited by aware; 11-04-2018 at 04:46 AM.

  2. #47
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    Quote Originally Posted by aware View Post
    Thank you. I have model 200 but nobody seems to ship to Greece (I have asked some). There are no custom or other taxes within Europe.


    Today I measured the diameter of the crankshaft. It is 31,95-32,00 when minimum in manual is 32,01mm.
    So if you try to dress it/polish off the scoring then it will unfortunately be well below tolerance and not just marginal. Sorry I don't know a better source of parts for you.

    I wish you luck on finding a good shop who can sleeve your crank or possibly source undersized bearings and turn down the crankshaft to match them.

  3. #48
    apriliaforum prov-nov
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    Spoke to special shop today, they can't access the side with wear because of the sprockets. The tool can't reach.
    Today bought a second hand crankshaft in good condition for 180 euros.

  4. #49
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    Glad you found a reasonable solution. Now be very careful to ensure that all the oil passages are clean and open.

    Some of those engines have some very small orifices in the crankcase that spray a mist of oil in some locations and will result in hot spots and extreme wear if they become clogged.

  5. #50
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    Thank you.
    The oil passages are difficult for me to to follow.
    For example, the oil holes at the bearing shells seems to be dead-end. Can it be?

  6. #51
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    Quote Originally Posted by aware View Post
    Thank you.
    The oil passages are difficult for me to to follow.
    For example, the oil holes at the bearing shells seems to be dead-end. Can it be?
    Likely they intersect at a sharp angle with another passage to get to the main feed. A rubber tipped blow gun is very handy for ensuring that you got them all cleaned out. G, B and E guitar strings used cautiously can also be helpful.

    Be very careful where you use sealant too so you don't clog anything when you put it all back together.

  7. #52
    apriliaforum prov-nov
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    Well I put new bearings on and some second hand crankshat assembly.
    Mixed feelings, much quieter but some "bing bang" at times when idling and most strangely the situation seems to be improving with time.
    Of course, it's too soon to come up with a firm conclusion. Only 20-30 km's driven and I am not travelling far yet until I feel confident.
    It was a journey - around 10 hours of work and my first time doing such a difficult job - that's why I feel unsure about the outcome.

  8. #53
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    Did you use an assembly lube high in zinc content on all the bearing and other wear surfaces? It also may be a partial clog in one of the oil passages or even a valve that is sticking occasionally.

    Yes sometimes its takes a bit of a "Leap of Faith" when you work on a repair like this for the first time.

    I like to run the engine in at the shop for an hour or so, thin the oil out a bit with kerosene or diesel fuel, run it for a few minutes more at very low speed to clean it out and then change the oil and filter before riding after a major repair on an old engine like this.

  9. #54
    apriliaforum prov-nov
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    I oiled them well enough but with no special lube since the repair manual didn't state anything.
    I now ordered such a lube for future potential use.
    I drive it calmly and seems to be behaving and sounding good.
    Still the verdict will take place after some long time. I am very conservative in my hopes.

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