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  1. #1

    water in the crankcase

    Hey guys... I found that one of pistons is cracked, and with the help of you guys was led to suspect that it was hydrolocked. So i checked the crank index, and it actually seems fine. But when I removed the cylinder of the damaged piston (PTO cyl), I found that the crank case was half full of water... obviously bad. My question is this: I've never gotten into one of the engines before, but i'm not mechanical retarded (i'm a mech. engineer), so I'm thinking about just rebuilding the whole thing. I'm seeing a WSM piston kit from Parker Yamaha for $252 and a reman. crank for $245 on SBT. Each includes the necessary gaskets. Is there anything else I should count on needing? (I'm planning to have the cylinders bored .5mm while i'm at it)

    Oh, and I also have already bought the mikuni 3-outlet fuel pump and new fuel lines.

  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    Which year and engine model?

    SBT crankshafts typically don't get a warm reception around here, despite the low price. Engine durability over time with SBT components has sometimes been an issue.

    There are a few better regarded crank shaft rebuilders.

    One is Jeff at Midwest crank shaft.
    Contact Jeff at 1-920-434-3630

  3. #3
    Tony's Avatar
    Join Date
    May 2007
    North Carolina
    Give Jeff at Midwest a call.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Cleveland OH
    WSM pistons are good.

    Forget the SBT junk. You'll need to ship your crank to them IF it's deemed rebuildable, it's $245. Plus the shipping it both ways, you're closer to $350

    A quality crank rebuild will be close to that amount.

    Boring cyls is quite expensive. Anywhere from $50-70 a hole.

    So, just doing the quick math:

    Crank 350
    Pistons 250
    boring/hone 150

    Looking at 750.

    You might want to consider buying another engine or short block from someone like John Zigler and parting yours out. You'll get some $$$ back to put towards the new/used.

    Just a thought.

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