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rebore .030 over?

Discussion in 'Mechanic and Repair' started by SUPRASPORT, Jan 15, 2005.


    SUPRASPORT LawnSite Member
    Messages: 26

    I'am planning on rebuilding the Kohler K241 10HP for my cub 105. I measured the cylinder as the service manual says, high (top of cylinder) two measurments 90 degrees of each other and low the same. The standard bore for this engine is 3.2505 to 3.2515 The measurments i came up with using T-bore gauges and micrometer are (high) 3.267 -3.269 and (low) 3.273 - 3.272 To me it looks like it would have to be bored .030 over or am i missing something. Could any automotive machine shop with a boring bar perform this work? And about how much $ would it be?-----Thanks Todd
  2. General Grounds

    General Grounds LawnSite Senior Member
    Messages: 902

    :blob3: hey todd why not look into getting a short block, alot less trouble and probably same cost of reboring and warranty. tony
  3. Smalltimer1

    Smalltimer1 LawnSite Bronze Member
    Messages: 1,223

    You sure??? A short block is almost $1000, the rebore would only be roughly $100.
  4. General Grounds

    General Grounds LawnSite Senior Member
    Messages: 902

    :blob3: you may want to check your numbers i just short blocked a 25 kohler on my lazer and that was $700, you can probably buy a new 10 hp for like $400-500.
  5. Smalltimer1

    Smalltimer1 LawnSite Bronze Member
    Messages: 1,223

    Small Engine Warehouse has the K-241 shortblock for $705.00.
  6. mikemerritt

    mikemerritt LawnSite Member
    from MS
    Messages: 42

    Having built a few of these I would say build it yourself, save a bundle and enjoy your work. I have done them with aftermarket and OEM parts and both ways they turn out great. Stens offers a +.030 as well as the rest of the needed parts. You should be able to get it bored for 50.00 or less.

  7. Smalltimer1

    Smalltimer1 LawnSite Bronze Member
    Messages: 1,223

    If you build it......build it right--meaning not stock!!! Make that little Cubbie into a real bear!!! :blob2:

    Port/Polish, custom cam, custom carb, trim the little bear out with all the goodies.
  8. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    I know of a few people who might be able to turn you a cam if you don't want the base circle changed. Oh, and you'd have to provide them with a good core. Probably cost a couple of hundred bucks.
  9. sdwally

    sdwally LawnSite Senior Member
    Messages: 386

    Rebuild is the way to go in my opinion. Boring about $100 seems to be about right. Piston & rings are available from Napa, cheaper than OEM and just as good. Never had any problems with rebuild parts from Napa. Will be listed in their Power Equipment catalog.
  10. Oldtimer

    Oldtimer LawnSite Bronze Member
    Messages: 1,459

    Go to www.yetmans.com for the complete specs for your engine. Mike everything as you tear down the engine and you will know what will be required to rebuild it. Your local Kohler dealer might have engine tear down sheets to make it easier to record the measurements.

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