Kohler to Briggs conversion?

Discussion in 'Lawn Mowing' started by mistermopar, Jun 4, 2011.

  1. mistermopar

    mistermopar LawnSite Member
    Posts: 13

    The motor on my Scag walk behind (cv 20s kohler) let go of a wrist pin today I think. I have a 20hp Briggs off of a residentail mower. I know this isn't a long term fix, but I am desperate. I dont mind adapting two different wiring harnesses as long as they are compatable with each other (my kohler harness to a briggs motor) . Whats most important is if the shaft size is the same and the mounting will work without modifying the mower. I really apprecialtte any input, I'm even ready for a little bashing, I know this isn't the smartest thing to do. Thanks Chris
     
  2. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    I'm assuming this is a belt WB. Easiest way is go ahead and pull it apart. The shaft size and length are what's important. Even then you can still get a pulley that would let you get things lined up. Everything else is gravy. Mounting holes will prob line up if not drill new ones its just sheet metal. Throttle cables are pretty universal too. Graingers, northern and harbor freight are good sources for pulleys and cables on a Sunday.
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  3. mistermopar

    mistermopar LawnSite Member
    Posts: 13

    Okay I'm tearing it down now but I want to figure out the wiring first. The mower with the briggs has a connector with three wires a blue,Orange and black. The Scag's harness has three wires as well but they are green white and yellow. Can any light be shed on what each wire does on the two different harnesses. Thanks Chris.
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  4. Snapper Jack

    Snapper Jack LawnSite Senior Member
    Posts: 525

    Did you tear down the Kohler to see what damaged occurred? I believe they share the same bolt pattern,problem with Kolkers is they have so many different crankshaft lengths. They are wired different that's for sure. Good luck to you in getting your mower up and running again.
     
  5. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    You should be able to find the B&S schematic on their site and match to what's connected to the kohler.
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  6. mistermopar

    mistermopar LawnSite Member
    Posts: 13

    Motor is on and running all is functional. I had to change the wiring up a bit, I didnt cut the factory kohler harness. I will be putting another kohler back on it sometime in the future. I modified the kohler exhaust to fit the briggs, its wild how close they were I just had to widen the two into one manifold about a inch. The Briggs is alot quieter and smoother, I think it will serve okay until I can get a replacement for it.
     
  7. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    Nice job. Saved yourself a bunch of money. Its usually not a big deal as manufacturers offer different engine options all the time.
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    Last edited: Jun 5, 2011
  8. Snapper Jack

    Snapper Jack LawnSite Senior Member
    Posts: 525

    That was quickThumbs Up
     
  9. mistermopar

    mistermopar LawnSite Member
    Posts: 13

    It isn't mowing like it did, I think its not turning the rpms the kohler did. It's leaving grass uncut and a strip of clippings. Any thoughts. Thanks Chris
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  10. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    Throttle opening all the way? Same size engine pulley?
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