Question about Ryobi 30 Cubic Centimeter Gas Brush Cutter

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I have to prime with fuel direct into the cylinder by removing the plug to get it started. It will then run at full throttle. If I let off the throttle it dies. If it is hot it will restart by just chocking. It has a new carb. & plug.

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First I'd try opening the low speed mixture screw a smidge (1/8) turn increments and see if that might improve the idle to full throttle transition.....if that doesn't help try cleaning the carb....other things to check are the vent in the fuel cap....the filter in the tank inlet line and whether fuel is getting to the cylinder on starting ( pull start handle a few times, then remove the plug to see if your'e getting fuel to the cylinder) sounds like your'e not getting enough fuel to start....maybe a clogged mixture jet....hope this helps ;-D

Posted on Jul 15, 2010

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I suspect the rings are worn and not sealing as well. the small two stroke engines such as that one are designed for 25 - 50 hours depending on the brand and model.

Posted on Jun 04, 2010

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1 Answer

Trimmer won't prime to start


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You need three things things to get the engine to run.

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Check compression. 120-140 is good. over 100 it will run. Less than 90 is below service limit. Remove the muffler and look at the cylinder and piston. Do you see lines running up and down? a dull grey color? Those are signs that the motor is burnt up. The cylinder should be shiny, almost chrome, with no marks on the walls.
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Check for your accelerator pump is pumping fuel directly into the engine when you rotate the throttle, if not then you probably need a carburator fuel pump kit. (usually located on the outside of the carbs). However, through following the mechanical linkage, you can see that it leads directly to the little pump assembly as well.

Good luck my friend.

kd4rua

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The motor turns over when I turn the key but it will not run. New battery, new plugs, new fuel line, and cleaned carbs. Fuel petcock was left open a couple times when I first got the bike. Has not been...


ARE YOU GETTING A SPARK AT ;PLUG REMOVE PLUG HOLD AGAINST ENGINE BLOCK TURN OVER ENGINE YOU WILL SEE SPARK OR FEEL IT IF YOUR UNLUCKY BE CARFUL IF NO SPARK TRY CHANGING SPARK PLUG LEADS COULD BE U/S GOOD LUCK [FROM THE AUTO ELECTRICIAN]

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1 Answer

My 2005 450x is hard to start and when it does start it will not stay running


Install a new stock spark plug. Clean the air filter then remove and clean the carb. Drain the gas tank, clean out rust and any trash, and remove the fuel valve to clean the internal tank filters. Now install an in-line fuel filter in addition to the tank filter.
3a4f4c0.gif What follows is just in case it will help out. Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} There is a proper way to start the engine. Four controls are on your bike to assist in starting. Below are generic instructions.
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  • The throttle, used to prime the cylinder, (power valve).
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm, (Power valve), in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), for six kicks. After six kicks go ahead and twist the throttle again for a second priming. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting. Note that not all carbs have a power valve. When a power valve is not present you should crack the throttle open only 1/8 inch from closed on each kick.

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1 Answer

Will not start. I prime the unit by depressing the bulb 7 times, the choke is full and the throttle is full. It simple does not try to start.


take the spark plug out pull the rope and see if gass comes out of thr cylinder which tell you theres to much gas coming out if your getting to much gas pinch your fuel line pull till it starts thenunpinch it if its firing it will start

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hey pete
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