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Merc 75 4 stroke turns over but wont run

Checked plugs, good. get it to turn over and have hold the throttle wide open and it idles rough, i hear some popping and let the throttle go and it shuts off. been sitting up about 6 months since last start

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Carbs, are gummed up. Pull the carbs and clean em, you'll be up and running in no time. The gas they sell now days, it don't take long for it to varnish.

Posted on Jul 27, 2009

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I have a 95 suzuki sidekick jx and it wont start. it tries sometimes but wont start. it has good spark, 180psi compression, has fuel, timing is good. if i hold the throttle wide open it will start and run...


My first guess would be a leaking fuel pressure regulator or a problem with the injector grounds. The injectors may be "on" too much.
Is the check engine light on when you can get it running ?

Sep 27, 2012 | Cars & Trucks

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Fuel mix and slow/fast running jet ajustment Dolmar sach 119. starts easy wont pull under load.


Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...

http://www.youtube.com/watch?v=3Lw0pJcEPYo&feature=player_embedded

Dec 08, 2010 | Garden

1 Answer

WILL YOU PLEASE TELL ME HOW TO ADJUST THE CARB AIR-GAS THE THREE YOU TURN WITH A SCREWDRIVER


Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...


Dec 07, 2010 | McCulloch Garden

1 Answer

Engine quits when throttle is opened


Most weed eaters are two stroke. You have a high and low idle screws on the carburetor. Assuming you have the right fuel mixture. Turn both screws in lightly until seated. Turn two turns out. You should see an h for high and l for low. Stat with low screw first turn in or out until running smooth. Then do the same with high idle screw holding full throttle. Once running smooth in high . Go back check low idle. Should run fine after this. Also check plug see if carbon fouled.

May 21, 2010 | Craftsman 25cc Gas Line Trimmer

1 Answer

Hard to start, and wont idle long.


Check the air cleaner and muffler for plugging first. Turn both jet needles CW to stops (lightly), then back out each CCW 1-1/2 turns. Turn the idle speed screw CW about 1/2 turn. This is a basic setting and the engine should start and run. Allow to warm up, then pull the throttle full on and adjust the H needle CW til the engine speeds up somewhat, but is still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and allow to idle. Turn the L needle CW until the engine runs fairly well, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops moving, but still allows the engine to keep running. Hope this helps!

May 10, 2010 | Garden

2 Answers

My poulan wild thing 2375 bogs out when throttle


Make sure that the air cleaner and muffler are not plugged. Check the carburetor screws and nuts for tightness. After turning both needles CW to stops (lightly), back them out CCW 1-1/2 turns each. Start the engine and allow to warm up. Open the throttle and adjust the H needle CW somewhat until the engine speeds up, but is 4-stroking. Correct adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L CW till the engine runs fairly smoothly, but allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain doesn't turn, but the engine keeps running. Hope this helps!

Apr 15, 2010 | Poulan Wild Thing 2375 18" Gas Chain Saw...

1 Answer

I can't get the idel set on the McCulloch Mac130 chain saw. It runs wide open. When you try to idle it dies out.


Try turning the L needle CW to stop (lightly), then back out CCW 1-3/4 turns. Turn the idle speed screw CW about 1 turn. Start the engine and let warm up. Set the idle speed screw so that the engine keeps running but doesn't pull the chain. Turn the L needle CW until the engine runs fairly smoothly, yet allows the engine to 'follow the throttle'. Make sure the H needle is adjusted at full speed for 4-stroking, but immediately 2-strokes when starting to cut wood. If the above idle mix (L) adjustment doesn't help, you will likely need to clean the idle jets within the carburetor. Hope this helps!

Mar 13, 2010 | Garden

2 Answers

I have a poulan 2150. it will start but will not stay run


Check the muffler for screen plugging. Clean or replace the air cleaner. Check the fuel filter in the tank for plugging. Check the fuel lines for hardening, cracking, or other decomposition. If still mal-functioning, re-kit the carburetor. Basic H and L settings are (from light CW stops) CCW 1-1/2 turns each. Start the engine and allow to warm up. Hold the throttle wide open and turn H CW until the engine speeds up, but still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow the engine to idle, adjust L CW until the engine runs fairly smoothly, but still allows the engine to 'follow the throttle'. Adjust idle speed so that the engine keeps running, but doesn't try to run the chain. Hope this helps.

Feb 20, 2010 | Garden

3 Answers

Poulan saw wont run


Clean the muffler spark arrestor screen and check the cylinder port for carbon build-up at the upper edge. Try presetting both carburetor H and L adjustments (from lightly CW stops) 1-1/2 turns CCW each. Start the engine and allow to warm up. Pull the throttle wide open and adjust H CW until the engine speed increases, but still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L for smoother running, yet allows the engine to 'follow the throttle'. Set idle speed to keep the engine running, but doesn't try to move the chain. You may have to look closer at your carburetor if the above doesn't help. Go to:
http://www.drystacked.com
for an excellent article (but poor pix) on Walbro carburetors, but related to most all 2-stroke carburetors. Hope this helps!

Feb 18, 2010 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

1 Answer

I get it started it runs as long as you have it wide open but you let of the gas it dies


This might require adjustment of the hi speed carb screw, the lo speed, and the idling screw as well.
The engine needs to be good and warm, you need to be certain you have a fresh fuel mixture in the tank, and you should check the air filter because it too affects the way the saw will run at low speed and idle.

I would start with the hi speed adjustment screw since wi does start. Fire it up and run it a bit to make sure you have it warmed up.

You may need someone else to help you hold the saw while you make these adjustments. With the throttle wide open, turn the hi speed screw slowly, in increments of 1/4 turn, to the left. It may be just a bit off. The objective here is to turn one way until it sputters or runs a little rough. Then turn it the other way until the engine smooths out. Continue to turn in the same direction until it again runs rough. Then turn back about halfway between those two points.

It should run well at wide open throttle. Place your screwdriver in the low speed adjustment screw and turn to the left, in small 1/4 increments like you did before. The objective here is to adjust to the point where the saw will throttle up quickly and smoothly, and more and more from an idling position, or as close as you can get.

If you find you don't get that, and the ramp up is choppy and unsmooth, adjust in the other direction. Eventually you should get to a point where you have quick response to your throttle. You should get to a point where it runs without being wide open.

If it fires up easily and throttles up smoothly but won't idle, the you need to adjust the idling screw. Adjust it until the chain begins to move on the bar when you let the throttle go. Once you get to the point where it idles with the chain moving, back off the adjustment until the chain just stops moving.

Make sure the air cleaner is clean. You may have to clean the carb with spray carb cleaner while it is running at full throttle. If you do, spray a tiny bit at a time, as it will almost kill the engine.

Finally, after all this work, invest in a new spark plug, even if the one in it isn't that old.

Sirwriter

Jun 15, 2009 | Garden

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