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Ryobi 31cc , 17inch weed ,hard to start ,needs to stay choked to

Ryobi 31cc , weedeater, hard to start ,needs to stay choked to run sometimes will not excelerate

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I got on here to find the solution for the same problem. This seems to be fairly common. I need to have it at 3/4 choke to run properly. Other posts say the exact same thing, about the 3/4 choke. It is apparenly something that breaks occationally.

I'm going to remove the carb and take it apart. My suspection is the diaphram in the bottom of the carb. There isn't much you can do with the carb, it is very simple and has few parts.

There is a chance that it is a blocked passageway also.

There are instructions for adjusting the mixture, but they are not clear enough. I will be posting a clarification reqest on one of those posts. Will also post again after I check the diaphram.

Posted on Aug 04, 2009

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The 700r? yes just spent 2hrs on this one today and might have come to 2 possibles #1st check the right spark plug and the magneto gap re; flywheel? 2nd the filter in the carb restricting flow looks cheap.

Posted on Apr 15, 2010

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Just found the fix for our 31cc 17'' Ryobi and its not wanting to run, sometimes not wanting to start. Also this fix took care of the air in the primer line.

Turned out that it was the cylinder head to crankcase bolts had backed out. The visual "telltale" was the head gasket was waving at me. This causes an abundance of air to goof things up.

If you ever need to find out if there is a leak similar to this, spray some started fluid around the base of the carburetor or the head. If the engine starts screaming RPM's, you found a likely area to investigate.

It took a 30T Torx tip and a 6'' Cresent wrench to get them tightened down... for the time being anyhow. While you are tightening things, check the muffler and the choke assembly screw. Both mine were loose.

I have had this same thing happen with a SkiDoo Elan snow machine, a couple of different makes of chain saws and now this Ryobi.

As long as I am here please check out www.litedriver.com

Posted on May 02, 2010

  • dmhandyman Jul 25, 2014

    Keep in mind that starter fuild is explosive. Spraying it on a running motor can cause a fire or explosion.

  • Ken Wells Jul 25, 2014

    Giving starter fluid to an engine is never good. Use only premium NON-ethanol gas. Here, we can only get in Premium or go to a marina for gas. Do not use off the shelf ethanol remover. Only additive I use is Sta-Bil. Do this gas and I guarantee in a minute you wacker will hum.

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