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  #1  
Old 08-05-2008, 09:21 PM
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markahurley markahurley is offline
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echo blower--possessed?

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?
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  #2  
Old 08-05-2008, 10:06 PM
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ed2hess ed2hess is offline
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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.
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  #3  
Old 08-05-2008, 10:27 PM
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SLR SLR is offline
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Sounds a case of a coil crapping out.
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  #4  
Old 08-06-2008, 02:45 AM
mngrassguy mngrassguy is offline
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I'd go with the coil. Check with your dealer. Some coils have a lifetime warranty.
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  #5  
Old 08-06-2008, 02:48 AM
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Happy Frog Happy Frog is offline
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Try to replace the spark plug first. It is cheap and easy. Next step would be the coil...
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  #6  
Old 08-06-2008, 05:12 AM
echoman8 echoman8 is offline
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Echo stalls when hot""


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




FUEL PROBLEMS

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?

De
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  #7  
Old 08-06-2008, 07:26 PM
topsites topsites is offline
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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

Now I have to go fix my trailer lights, for the umphteenth time.
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  #8  
Old 08-07-2008, 11:50 AM
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BigFish BigFish is offline
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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
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  #9  
Old 08-07-2008, 11:58 AM
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QualityLawnCare4u QualityLawnCare4u is offline
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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.
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  #10  
Old 08-07-2008, 05:18 PM
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Tharrell Tharrell is offline
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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
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