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How to adjust rpm's on Briggs Vanguard?

Discussion in 'Mechanic and Repair' started by MRPLOW, Sep 24, 2001.


    MRPLOW LawnSite Member
    Messages: 88

    I have a 16 hp Briggs Vanguard. It runs at 3480 under no load. How do I adjust the rpm's to 3600 like it should be at. I've adjust the throttle cable as far as it will go. Some help would be greatly appreciated as I've been looking for this answer for some time.
  2. awm

    awm LawnSite Gold Member
    Messages: 3,354

    not the right way , but i have just bored out the air intake.
    i know mechanics u dont have to say it. but it worked be sure and plug intake well . but like i said a small engine mechanic can do it right. hate them little plastic caps
  3. Eric ELM

    Eric ELM Husband, Father, Friend, Angel
    Messages: 4,830

    I moved this to the Mechanic forum with a redirect from the Commercial forum to here. There are several good mechanics that come here a lot that can probably answer this without any problem. ;)
  4. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    there should be a speed adjustment screw on the carb. turn it counter clockwise to increase RPM's. that should help.
  5. John DiMartino

    John DiMartino LawnSite Silver Member
    Messages: 2,555

    My Vanguard has 3 positions that the governor spring can sit in,on the governor shaft,,behind the carb,mine is in the weakest position,if you move the spring to the stronger position,it will bring the rpm's up about 300,then adjust it down to 3600 with the cable,it is a PITA to get to on my greensmower,you almost have to take off the fuel tank to get to.Yours mightb e easier to get too,have to do it cold on mine,or get burnt by the Y pipe.
  6. GrassMaster

    GrassMaster Senior Member
    Messages: 447


    I would suggest that if you never done this before & Do not know how? Do this!

    Take it to a Good Mechanic & ask him to show you, plus explain it to you as he does it. Ask plenty of Questions & if it Cost you Triple it's Worth every dime he charges you, then some!

    Lot of Engines get Destroyed because Lack of Know how on Adjusting Engine RPM's. Too Little or Too Much can Hurt you either way.

    Too Little RPM's Kills your Productivity and Quality of Cut!

    Too Many RPM's Shortens the Life of your Engine Quite a bit!
  7. Fish

    Fish LawnSite Member
    Messages: 139

    For any of you, see if you can chat with the best mechanic in the
    shop you frequent and ask him advice. If he gives you good
    advice, shake his hand with a 10 or 20 dollar bill in it, you will
    save a lot of money in the long run. He will go out of his way
    to take care of you. Just an observation.

    MRPLOW LawnSite Member
    Messages: 88

    Thanks guys I tried both suggestions. I was able to get the rpm's up to 3600. Unfortunately the rpm's are the same when the blades are engaged. That is about 3330 which is the same as before. They rpm's are at about 3100-3250 when cutting grass. Even though I increased the top speed rpm's by 100 it didn't effect actuall operating conditions. I was hoping to bring the rpm's when cuttin grass to 3300-3450. I think my 16hp briggs may just be tired and underpowered for a 52 inch wright stander. I will probably replace in a few months.
  9. John DiMartino

    John DiMartino LawnSite Silver Member
    Messages: 2,555

    I think its at its limit,sounds like my kohler when i have doubles on it,no matter ho high you set the no load speed it bogs down when mowing.
  10. BRL

    BRL LawnSite Bronze Member
    Messages: 1,211

    I have an 18 HP Vanguard on my 48" Wright and its fine. But I do know of others having a hard time getting their 48's to run well with the 16HP. So I'm going to guess you're under powered for that mower.

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