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Truck, Trailer, and Outdoor Power Equipment Discussion, Repairs. Questions on your truck, trailer, commercial lawn mowers, lawn mower, mower parts, lawn tractors, engines, edgers, trimmers, pole saws, aerators, hydro seeders, snow plows, chain saws, stump grinders??

Carb on 2cycle continues to pull gas after off


Truck, Trailer, and Outdoor Power Equipment Discussion, Repairs.

Questions on your truck, trailer, commercial lawn mowers, lawn mower, mower parts, lawn tractors, engines, edgers, trimmers, pole saws, aerators, hydro seeders, snow plows, chain saws, stump grinders??
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Old 03-09-2011, 11:49 AM
Gls Gls is offline
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Question Carb on 2cycle continues to pull gas after off

I have a 240 sst snapper commercial trimmer that was given to me. It had been left outside for a decade it seems. I cleaned it up. Unfroze the throttle cable with pb blast and wd40. I finally got it to fire after a few days. It spoked like a chimney for 20-30 seconds but ended up reaching full throttle. I let it warm all the way up. Everything functioned great. I turned it off and when I came back; it had pulled the remainder of the gas, 1/6 tank, into the carb shock leaked out through the filter. I did custom cut a sponge to act as the dry rotted filter I cleaned out. This may be the source of the vacuum, idk.

I just found out I have this problem on an echo hc150 hedge trimmer I just rebuilt the carb on. Its like new but the homeowner stored it with gas in it so it was really gunked up. Stripped it down to the block(carb) and let it sit in carb cleaner overnight. Sprayed it down with carb cleaner(canned) and reassembled. It ran like a champ. I have ordered a gasket set with rebuild kit and new throttle o-ring. I know everything went back together correctly. I've taken it apart and put it back together via the parts diagram. I will have the new parts at the end of the week.

I am not a small engine mechanic but have done automotive work for years. I guess I know enough to get me in trouble. I figured this is a simple problem on the hc150 but the snapper manual/parts diagram is for a mechanical engineer but the thing is built like a tank and looks cool as hell. It has blades on it and is as old school as they come so I would like to get it fixed if it's simple, as parts are non existent to more money than a new trimmer would cost.
Thanks for any and all imput.
I can post links to online manuals if it will help.
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  #2  
Old 03-09-2011, 05:32 PM
wandfsmall wandfsmall is offline
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from what I can see parts availability is not bad just expensive. I could sell you a brand new redmax high torq trimmer for less then the carburetor for that snapper...
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Old 03-09-2011, 05:42 PM
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Originally Posted by Gls View Post
I have a 240 sst snapper... is as old school as they come so I would like to get it fixed if it's simple, as parts are non existent to more money than a new trimmer would cost.
.
Thank you, but I realize this.
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Old 03-09-2011, 08:22 PM
CheapNEasy CheapNEasy is offline
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As far as the leaking issue, check the needle valve and seats.

You should be able to only blow through the fuel line, try sucking back through it like a straw... if you get any suction, then something isnt seating properly.

Just a quick thought for ya.
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Old 03-09-2011, 08:35 PM
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Thanks. I will check it first thing tomorrow when I get home. I figure it had something to do with the needle valve, that's why I ordered the repair kit instead of only a gasket kit. It was only $13. Comes with needle valve, spring, retainer and clip as well as all gaskets. I'm already tasting gas just thinking about your test... It's been a while lol.
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Old 03-09-2011, 09:04 PM
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The needle valve and seat takes a silent beating that most people over look... That my best guess for ya, let me know either way.
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Old 03-12-2011, 08:38 PM
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Quote:
Originally Posted by wandfsmall View Post
from what I can see parts availability is not bad just expensive. I could sell you a brand new redmax high torq trimmer for less then the carburetor for that snapper...
Ditto.

Old equipment means higher prices. Typically, unless it has sentimental value, buy new.

I will have to say, you may be able to get it going with a few new parts, but the big thing to remember is these small carbs are delicate components. Small adjustments mean big changes. If the EPA finds you making mistakes that affect emissions, expect to pay. BIG TIME. To the tune of THOUSANDS of $ PER VIOLATION.

Good luck
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Old 03-12-2011, 09:05 PM
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Quote:
Originally Posted by SuperiorPower View Post
Ditto.

Old equipment means higher prices. Typically, unless it has sentimental value, buy new.

I will have to say, you may be able to get it going with a few new parts, but the big thing to remember is these small carbs are delicate components. Small adjustments mean big changes. If the EPA finds you making mistakes that affect emissions, expect to pay. BIG TIME. To the tune of THOUSANDS of $ PER VIOLATION.

Good luck

from what I understand it is almost against the law to work on a carb inless you have been to school thats why I do not sell tools to adjust a carb. I sell parts but I am not getting caught in that one. $10,000 per violation for a $12 tool sale is not worth it.

Last edited by wandfsmall; 03-12-2011 at 09:08 PM.
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Old 03-12-2011, 09:12 PM
SuperiorPower SuperiorPower is offline
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Quote:
Originally Posted by wandfsmall View Post
from what I understand it is almost against the law to work on a carb inless you have been to school thats why I do not sell tools to adjust a carb. I sell parts but I am not getting caught in that one. $10,000 per violation for a $12 tool sale is not worth it.
Or give carb instructions.....
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Old 03-12-2011, 09:41 PM
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Quote:
Originally Posted by SuperiorPower View Post
Or give carb instructions.....
thats why I do not post them here, wish I could help but I do not understand the law enough to risk it. I still feel a little safe as that one guy on ebay with the dodge truck seems to be making a living selling carb tools I am sure they will get him first
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