Echo-370 Chain Saw Full Throttle Problem

jud149

LawnSite Member
This saw has only about a couple of hours on it but is several years old. I used it about a year ago and it ran fine. I ran the gas out of it before storing it. Today it will not run a full speed, only 3/4 and then will cut out periodically. However, it does idle fine. Now I just noticed that if I run it at about 1/4 choke, it will run at full speed.

The filters are obviously clean and I put a new plug in it as the old one was black, and removed the spark arrester which was clean. I tried to adjust the carb but to no avail. You can only turn the screws a half turn or so. Any ideas or is this just another carb I will have to rebuild because of ethenol? I have recently converted to non-ethenol fuel.
 
OP
J

jud149

LawnSite Member
Remove the limiter cap and open the high speed needle a bit at a time--see if that might help.
Thanks! Would you happen to know how to get the limiters off? I have the top and side off the saw but still can't see how to get to them. They are flush with a metal base with limited access.
 

piston slapper

LawnSite Platinum Member
Location
Tampa Fl
Walbro makes a tool that threads into the caps and threads them off.
You may be able to thread a small screw into the caps and pull them out.
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dutch1

LawnSite Silver Member
Location
Jayhawk
The proper way to remove the external limiters is with the Walbro tool as Slapper suggested. I've also heard of guys running a sheetmetal screw into them to push them off but have never tried that method. I've always use a duckbill plier to grasp the outer part of the limiter and pull straight out--along the same axis of the adjustment screws. Twisting or bending may result of bent needles or possibly breaking the needle off in the carb. I've even cut them off with a pair of miniature side cutters.
 
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jud149

LawnSite Member
The proper way to remove the external limiters is with the Walbro tool as Slapper suggested. I've also heard of guys running a sheetmetal screw into them to push them off but have never tried that method. I've always use a duckbill plier to grasp the outer part of the limiter and pull straight out--along the same axis of the adjustment screws. Twisting or bending may result of bent needles or possibly breaking the needle off in the carb. I've even cut them off with a pair of miniature side cutters.
There's no way to remove the limiters with pliers as they are flush with a metal extension on the carb. I probably can get them off with a screw as suggested but once the carb is adjusted, I believe they must be replaced since the adj. screws have no spring to hold them in place. What a joke. I knew there was a reason I keep my old Echo SRM 1501 weed whacker despite having some minor problems with it. Thanks again for your help, guys.
 
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jud149

LawnSite Member
I should add that the old ones will probably be destroyed and I understand new ones are not easy to come by. Does anyone know where to buy the tool?
 

piston slapper

LawnSite Platinum Member
Location
Tampa Fl
Jud....the caps aren't gonna make it run any better.
You can pry out the aluminum face cover that is shielding the screws, with a flat screwdriver.
Once you get the caps off the screws, they'll just look like screws.
A whole lot more user friendly.
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piston slapper

LawnSite Platinum Member
Location
Tampa Fl
You're probably right. Dutch.
My research dept has been out to lunch for some time.
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