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My yard machine 6.75 is idling a little low; how can I increase the engine speed?

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There is a spring by the air filter box on the front of the engine (spark plug side of engine). It is a little behind the air filter box. Using your index finger you will be able to pull it towards you. I would not move it very much. This will increase the rpms. To lower the rpms push it back a little. You may have to do this a couple of times to get the rpms just right. Hope this helps.

Posted on Apr 03, 2011


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How how to adjust the screws on the carburetor of the yard machine yard cultivator 31 cc

Hi Christi:
This is a "standard approach" that i've used for various small engines for a long time. It may not be factory specs, but it's worked for me.
- First, gently turn both screws in (clockwise) until they just touch the seat. BE GENTLE as you don't want to damage the needle or seat.
- Second, back out both screws 2 turns. This is a "guess" start point.
- Third, start using normal procedure.
- Once the choke can be opened, with the saw at an idle, adjust the slow speed screw until the saw runs at its slowest smooth idle.
- Finally, increase the engine speed and adjust the high speed screw.
Try turning it clockwise.
- If RPM increases, continue until it starts to decrease, then back off 1/4 to 1/2 turn.
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1 Answer

Ryobi line trimmer plt3043a starts idles but dies when i attempt to increase speed

May I suggest checking along the fuel line and its attachments for a very minor air leak. The minute it sucks air it will stop. Check any rubber washers or O rings too.

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Oil gauge drops low at idle

Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

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1 Answer

When the a/c is running, when you stop at an interesection the car stalls

That's usually caused be a low idle speed.
But the processor should increase the idle speed when the A/C is on.

Check the normal ,warmed up idle speed, then step on the brake pedal to see how much the idle drops with the stop light load. Then turn on the A/C to see how much the idle drops.

The processor should increase the idle speed to compensate for the increase in load on the engine.

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2 Answers

Idles good untill the ac is turned on, then engine surges for a couple of minutes and then stalls out

Your throttle body is dirty and needs to be cleaned....Buy a can of throttle body cleaner.
Now you have 2 can either do a remove and replace cleaning- or you can do a semi clean.,,,simi meaning leave the TB on- but spray the cleaner in- and move the plate back and forth to dislodge the accumulated crud. either way- is your choice....
But when you clean it- disconnect the battery for at least 30 min... so that it loses any bad learned settings...good luck, i hope this helps.

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Check your air filter. Replace the fuel filter.
These are the most negected items on the car.

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turning Hi & Lo mixture screws in leans the mixture,out rich-ens it.turn the T screw in to increase idle speed the chain should slowly come to a stop at idle [chain brake off] adjust Low needle first until it accelerates smoothly then Hi needle for best 'revs'.then Lo again if necessary if you don't know where they were set before,start w/ screws 3/4 to 1 turn out from a lightly seated position

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1 Answer

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Is speed idle a little bit low ?
Increase Idle speed abover 650 rpm to see it help.

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At idle speed the the pressere deliver by your steering pump are low; try to modified your pulley to increase the speed at low idle.

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