1. Missed the live Ask the Expert event?
    Catch up on the conversation with Ken Hutcheson, President of U.S. Lawns, in the Franchising forum.

    Dismiss Notice

echo blower--possessed?

Discussion in 'Mechanic and Repair' started by markahurley, Aug 5, 2008.

  1. markahurley

    markahurley LawnSite Senior Member
    Messages: 252

    i've got a pb 650 that starts and runs great--except when i really need it. it seems like when it gets to the hottest part of the day, it just won't run full throttle. it still starts right away, but as soon as i start to give it gas, it stalls it out.

    please don't give me the stupid obvious ideas of letting it idle at choke to warm up--it's nothing that simple. when it's cool in the day, it fires up and runs strong. when it's hot, even if i was just using it 30 minutes ago, i have to let it idle for 5 min before i can throttle it up. any ideas?

    i thought at first it might be the gas expanding in the tank, and building up too much pressure, but releasing the pressure seems to make no difference. so i'm stumped. any ideas?
  2. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,269

    Unfortunately the older units had no adjustment on the carb. If you are sure that the crank seals are not leaking and all tubes are new and not leaking then you might want to consider a carb with adjustment. If ...if you are really mechanical you can take the top of the carb off and turn that needle valve. You have to mark it with sharpie and slide a dispenser tube off a can of carb cleaner onto the needle to turn it. CW puts in more gas.
  3. SLR

    SLR LawnSite Gold Member
    Messages: 3,210

    Sounds a case of a coil crapping out.
  4. mngrassguy

    mngrassguy LawnSite Silver Member
    Messages: 2,167

    I'd go with the coil. Check with your dealer. Some coils have a lifetime warranty.
  5. Happy Frog

    Happy Frog LawnSite Bronze Member
    Messages: 1,224

    Try to replace the spark plug first. It is cheap and easy. Next step would be the coil...
  6. echoman8

    echoman8 LawnSite Senior Member
    Messages: 293

    Echo stalls when hot""

    My thread is similar. I have no solution, but this has helped over the past few years:


    For the past few years, I have had “vapor lock” TYPE conditions on some of my trimmer motors and chainsaws. I am using all Echo units. After normal use, (and especially on a hot day) the motor, after sitting a few minutes, will fire and die. If I place the choke at ½ closed, it may run poorly for a little before dying. All this time, the motor is running in a lean condition, bogging down when the throttle is pressed.

    I was told that fuels were blended by the seasons now. In the Winter the fuel puts off a lot of fumes and in the Summer there were less fumes (these fumes being called “light fractions”).

    The solution was to leave the gas cap off overnight and allow the fuel mix to evaporate.

    I am now buying premium fuel, allowing it to vent at least overnight, and mixing my 2 cycle mix at 32-1 rather than 50-1.

    All seems to help but on a hot day in the winter at Alpine Texas area (5000’ elevation) I still have some problems. It is not fun when I am high in a tree with a saw that does not want to run.

    Anyone else have similar problems?

  7. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Way I deal with this BS is I put the 2-cycler in a shade spot like between truck and trailer and let it
    sit there for a few, that or cover it with a tarp or see about parking in a shady spot.

    It could be the coil but some to most of mine have done this on very hot days, they can't all be bad :p

    Now I have to go fix my trailer lights, for the umphteenth time. :cry:
  8. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,059

    Couple of things... check plug gap.. check spark screen.. check carb mtg block is tight, check carb is snugged up.. make sure the cyl to block is tight.. clean all the fins and air inlets.. adj carb
  9. QualityLawnCare4u

    QualityLawnCare4u LawnSite Gold Member
    Messages: 3,758

    I have the same exact problem with the same exact blower. I have cussed that thing several times the past few weeks, dies out on me right in the middle of a job. Sometimes I get lucky and get 5 minutes out of it.
  10. Tharrell

    Tharrell LawnSite Silver Member
    Messages: 2,967

    I have a 751t and a 651t, they don't do that at all. The only problem I've noticed lately is a "hiccup" once in a while at WOT that may be attributed to some possible bad gas or the summer gas mix. I run premium in all the 2 cycle stuff and they fire up better and seem to run better. I also use Opti 2 oil in all of my 2 cycle stuff, Robin, Stihl, Echo. Tony

Share This Page