2 cycle engine question
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Senior User
Joined: May 2003
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From: Home of FDR, NY
2 cycle engine question
I have a Ryobi 2 cycle weed trimmer about 3 yrs old. It starts & warms fine, but I need to keep it choked to run at all & it doesn't throttle up at all. I can keep it running by pressing the primer, but this is becoming intolerable. I'm thinking it's starving for fuel- what do you folks think? I have fresh fuel, clean plug & have blown gum cutter thru the fuel system- what else should I try?
Thanks,
Jeff
52 F3
02 F250
Thanks,
Jeff
52 F3
02 F250
Senior User
Joined: Mar 2003
Posts: 288
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From: Northeast Wisconsin
Sounds to me like the main jet in the carb is restricted. Take the carb off and soak it in a can of "real" carb soak solution (available at any local auto parts store for about $15.00/gallon) for several hours. Follow the instructions on the can, because this stuff is really strong and will strip just about every non-metallic thing known to mankind (including rubber, plastic, paint, and skin). Then blow out all the passages with compressed air after the soaking. The areosol carb cleaners, like Gumout, just don't hack it. The "varnish" and other gunk needs dwell time in the stronger soak solution to soften and dissolve.
Cargo Master
Joined: May 2003
Posts: 2,561
Likes: 1
From: Earth
Two things I would check:
1) Clean the screen on the exhaust, if there is one. I had a Shindaiwa that would plug up the screen on the exaust and it would hardly run. After I cleaned it, it ran great.
2) If you don't run it that much, chances are that the carbs are gunked up. It happens on my 2-stroke snowmobiles after a while. Your carb probably needs a good thorough cleaning.
Keep us posted
1) Clean the screen on the exhaust, if there is one. I had a Shindaiwa that would plug up the screen on the exaust and it would hardly run. After I cleaned it, it ran great.
2) If you don't run it that much, chances are that the carbs are gunked up. It happens on my 2-stroke snowmobiles after a while. Your carb probably needs a good thorough cleaning.
Keep us posted
Posting Guru
Joined: Sep 2002
Posts: 2,420
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From: Langhorne, PA
I just tried seafoaming my stihl weedwacker. It was running a little rough, and probably had some varnish damage. I left the stinking oil/fuel mixture in it all winter. I got it started, let it run for about 5 minutes to warm up the engine, I removed the air filter cover and filter, and sprayed some "deep creep" aerosol-style seafoam into the carb, I cranked the engine a few times with the ignition switch off to get the cleaning fluid into the intake and carb.
I let it sit for about 1/2 hour, and restarted it. It took about 10 pulls, cause I basically soaked the carb, but when it kicked over, I got alot of smoke, and I believe that I may have burned some of the varnish out. The weedwacker ran better after that.
However, I have no clue what the consequences are when using seafoam on an engine like that. I think the seafoam works great on car engines, 4 to 6 HP lawn mower/snowblower engines, etc, and this was the first time I ever used it on a 40 CC or similar size engine. Seafoam seems to bust up carbon/oil deposits pretty good.
I let it sit for about 1/2 hour, and restarted it. It took about 10 pulls, cause I basically soaked the carb, but when it kicked over, I got alot of smoke, and I believe that I may have burned some of the varnish out. The weedwacker ran better after that.
However, I have no clue what the consequences are when using seafoam on an engine like that. I think the seafoam works great on car engines, 4 to 6 HP lawn mower/snowblower engines, etc, and this was the first time I ever used it on a 40 CC or similar size engine. Seafoam seems to bust up carbon/oil deposits pretty good.
Cargo Master
Joined: May 2003
Posts: 2,561
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From: Earth
Originally Posted by 924x2150
However, I have no clue what the consequences are when using seafoam on an engine like that. I think the seafoam works great on car engines, 4 to 6 HP lawn mower/snowblower engines, etc, and this was the first time I ever used it on a 40 CC or similar size engine. Seafoam seems to bust up carbon/oil deposits pretty good.
Fleet Mechanic
Joined: Aug 2005
Posts: 1,688
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i use seafoam on all engines that run on gas, no problems. Its good stuff. However, it only does so much, so if its still giving problems, i think a carb cleaning is in order. there are some TINY orifices in those carbs, and even a little varnish can plug it up.
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From: Home of FDR, NY
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From: Ontario, canada
Before you tear into the carb, do the following;
1. Fresh tank of premix. Mixing gas with 2 stroke oil shortens its storage life.
2. Clean the air filter and exhaust screen
3. try adjusting the high speed jet. Carefully close it all the way counting the number of turns to an eighth of a turn. Open the jet 1 ¼ turns, start the engine, warm it up.
Hold the throttle open and adjust the jet until you get the best throttle response and highest engine speed.
1. Fresh tank of premix. Mixing gas with 2 stroke oil shortens its storage life.
2. Clean the air filter and exhaust screen
3. try adjusting the high speed jet. Carefully close it all the way counting the number of turns to an eighth of a turn. Open the jet 1 ¼ turns, start the engine, warm it up.
Hold the throttle open and adjust the jet until you get the best throttle response and highest engine speed.
Fleet Mechanic
Joined: Feb 2004
Posts: 1,448
Likes: 2
From: CA Central Coast
My Deere (rebadged homelite ) trimmer was acting the same way . A local fixit guy told me with a wink that I was "not allowed by emissions laws to remove the plastic anti tamper doohickeys on the carb adjustment screws".
So I went home, did it, turned the screw a 1/4 turn, and my weeds are very unhappy.
So I went home, did it, turned the screw a 1/4 turn, and my weeds are very unhappy.
Senior User
Joined: Jan 2005
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Originally Posted by e1p1
My Deere (rebadged homelite ) trimmer was acting the same way . A local fixit guy told me with a wink that I was "not allowed by emissions laws to remove the plastic anti tamper doohickeys on the carb adjustment screws".
So I went home, did it, turned the screw a 1/4 turn, and my weeds are very unhappy.
So I went home, did it, turned the screw a 1/4 turn, and my weeds are very unhappy.
Laughing Gas
Joined: Dec 2003
Posts: 796
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From: KCMO
I always carry those little plastic caps with me when I'm wackin, just in case I see some emission police sneakin up on me. Oh yeah - I also stay up late at night practicing putting them back on in a hurry. Also, this isn't me saying this - I'm just some dude who stole this password.
Fleet Mechanic
Joined: Feb 2004
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From: CA Central Coast
Originally Posted by pchristman
I always carry those little plastic caps with me when I'm wackin, just in case I see some emission police sneakin up on me. Oh yeah - I also stay up late at night practicing putting them back on in a hurry. Also, this isn't me saying this - I'm just some dude who stole this password.
...then
'cuz that's what we're heading for. 
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