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  1. #61

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    Re: Kohler CH740 power issues.

    Quote Originally Posted by bertsmobile1 View Post
    Kohler parts are what I would call a reasonable price ( Briggs parts are under priced & Kawakasi parts tend towards over priced ) .
    Some will say Kohler parts are expensive so pull the parts out , measure & check everything before you start to order parts.
    If you are not feeling confident the post the full list of what you intend to replace.
    I am sure there will be enough contradicing opinions to totally confuse you.
    I have all my opinions ready,
    If it ain't WORE don't Replace it.

    Let the contradictions begin!.......
    I know enough to be dangerous

  2. #62

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    Re: Kohler CH740 power issues.

    Quote Originally Posted by F150Fan80 View Post
    Hopefully this picture helps. I just put these on and they have only been used for roughly ten minutes. Basically brand new.

    Attachment 46227

    Here are some pictures of each piston and the jug they came out of. I haven't tried to put a ring back in each as of yet. I hope to try that later tonight if I don't get really tired first from getting off midnights.
    Side one:

    Attachment 46220Attachment 46219Attachment 46221Attachment 46222

    Side two:

    Attachment 46223Attachment 46224Attachment 46225Attachment 46226
    ILENGINE, can you tell me which style pistons I have? I think that via the parts diagram I'm looking at now they look like both. Lol

    IMG_7411.jpgIMG_7410.jpgIMG_7411.jpgIMG_7410.jpg

  3. #63

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    Re: Kohler CH740 power issues.

    Looked up images with the part numbers, to me it looks like you have style B, I noticed style A the area around the wrist pin was more rounded, style B
    Was square -ish like yours...


    But wait and see what others say.
    I know enough to be dangerous

  4. #64

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    Re: Kohler CH740 power issues.

    The Kohler dealer parts lookup site only shows the Style B rings and pistons. Doesn't appear that Style A was used on your spec number. Something to check is the thickness of the top piston ring. 1.2 mm is the style B and 1.5 mm is the style A,
    ILLINOIS ENGINE, BEECHER CITY, IL
    BRIGGS AND STRATTON MST (MASTER SERVICE TECHNICIAN)
    Sales and Service for Dolmar/Makita, Poulan, Briggs and Stratton, Kohler, Lauson(Tecumseh, LCT), Brute, Honda, Subaru
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  5. #65

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    Re: Kohler CH740 power issues.

    https://www.partstree.com/models/ch7...6-ch18-750-12/

    Look at the piston Diagram in the schematic, #32 top left,
    I know enough to be dangerous

  6. #66

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    Re: Kohler CH740 power issues.

    Top ring is 1.5mm according to my caliper. Looks like I have style A. What was the reasoning for the new style piston? Should I change them out or just re-ring what I have? The pistons look pretty good. They just need a bit of a sprucing up is all.

  7. #67

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    Re: Kohler CH740 power issues.

    Piston manufacturer may of changed. From what I found the standard size Style A rings are NLA. So may have to convert to style B piston ring assemblies.
    ILLINOIS ENGINE, BEECHER CITY, IL
    BRIGGS AND STRATTON MST (MASTER SERVICE TECHNICIAN)
    Sales and Service for Dolmar/Makita, Poulan, Briggs and Stratton, Kohler, Lauson(Tecumseh, LCT), Brute, Honda, Subaru
    Warranty service for Snapper sold at Walmart, Craftsman by MTD, Murray, Karcher, Earthquake, Yamaha engines, American Landmaster, Worx, Rockwell Tools, Great Lakes Technologies products(Wen, CZ), Generac portable/DR power and others.

  8. #68

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    Re: Kohler CH740 power issues.

    Quote Originally Posted by ILENGINE View Post
    Piston manufacturer may of changed. From what I found the standard size Style A rings are NLA. So may have to convert to style B piston ring assemblies.
    What numbers are you coming up with? So it's looking like I'll need new pistons w/ rings then right? Is the rod the same? I just want to make sure that I can reuse the original rods since there is no need to replace those.

    EDIT: Just found these on eBay. https://www.ebay.com/itm/KOH-24-108-...b~YzK#shpCntId

  9. #69

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    Re: Kohler CH740 power issues.

    Look at the parts tree link I posted, everything is available and/or got superceded to a new part number
    I know enough to be dangerous

  10. #70

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    Re: Kohler CH740 power issues.

    Quote Originally Posted by Scrubcadet10 View Post
    Look at the parts tree link I posted, everything is available and/or got superceded to a new part number
    I did go to that link. The standard replacement rings for my style piston are no longer available from there either. It wants to supercede to the new style piston and ring assembly. I found someone with NOS OEM standard rings for my pistons on eBay. Those are way cheaper than a new piston and rings. The new pistons use a thinner ring at 1.2 mm instead of what mine uses, a 1.5 mm thick ring.

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