honda gx620 surging at WOT

Discussion in 'Mechanic and Repair' started by JRS Landscaping, Jan 28, 2014.

  1. JRS Landscaping

    JRS Landscaping LawnSite Senior Member
    Posts: 817

    Well finally success. I took the old main jet and filed it slightly larger with a torch tip cleaner set like metioned before. by restro and bigfish. Runs awesome with no choke anymore!

    Restro Thank you for all your help!.....hope i didn't drive you nuts! :dizzy: LOL

    Land rus. im 40 min from GWB.

    Tiger. I was running with an air filter but no pre filter. Run fine with slight choke or if i squeezed the rubber boot to restrict airflow very slightly. Unit sat for years and bought at estate sale not running. I just got it going again don't know history except 160 hours on machine
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Naw...... Not at all, I only wish you had'a opened the jet before buy'n a new carb.....

    NOT "crazy" at all tiger, Perhaps you missed this;

    And the SAME thing happened to JRS, Ain't no fancy pants carb cleaner gonna open a main jet to MAKE a engine run correctly.

    Sometimes ya gotta do what ya gotta do...... ;)
  3. tigerepairdotcom

    tigerepairdotcom LawnSite Senior Member
    Posts: 325

    We don't know all the facts. We don't know if he bought an oem carb or aftermarket. If it was an aftermarket then I can imagine it not being quite perfect. As far as carbs go though your right. You do what you gotta do. I have never had to modify an oem carb on a honda engine just saying.
  4. BigFish

    BigFish LawnSite Gold Member
    Posts: 3,268

    Imagine that! Bet yer wishin' you tried that trick, before ya bought that new carb, huh? At least ya got it running OK.
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    The facts we do know is most aftermarket carbs are built to OEM specs, Both JRS's old and new carbs had a #95 main jet, There's a very slim chance a brand new carb will have a dirty restricted port/passageway, All engine manufacturers are REQUIRED to lean engines out to pass emissions regulations......

    I had four (4) brand new carbs that caused a surge on two (2) brand new out the box 8000 watt gen sets, Someone down the pike got the jet ports too small causing a lean run surge from the factory. I likely could have ordered a whole case of carbs and still ended with the same results (surge), The ONLY fix was to drill the jets to the next size.

    After the above ordeal, I have no issues with drill'n a jet out if all else fails...... And on a brand new machine, I'll drill first before ordering another new carb.......

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