Question about Poulan Pro PR550N21RH 21Inch 190cc Briggs Stratton 625 Series Gas Powered Side DischargeMulchBag Lawn Mower (NonCARB Compliant) ()

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Engine is not running as fast and as loud as it was before? Air filter good and Oil is good could it be a spark plug?

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If the motor is running, it has nothing to do with the spark plug. Those small engines have a rev limiter the gives the engine more power when under strain and then reduces the power when not under strain. This is a simple fix. Look near the carburator. You will see some rods with springs and one of those rods goes in toward the engine. More than likely, you have an over stretched spring. If you can do it, (***SAFELY***), start the motor and give a gentle tug on that rod. The engine will REV UP! This will solidify my point that the spring is wore out. Easy and cheap fix. Just be aware of the spinning blades under the deck, unless you have a blade disengage feature but I am not aware if the Poulan has that option on the handle bar.

Posted on May 14, 2010

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Posted on Jan 02, 2017

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Stihl br350 backpack blower will only spark when pulled fast. It will not start pulled fast or slow!


To start a small two stroke engine the rope needs to pulled rapidly. So from what you are saying I believe that your problem may not be in the ignition system. An engine needs three things to start and run- air, fuel and spark. Make sure that it is getting enough air by checking the filter and make sure if its a foam element that no foam has torn from the element and been sucked into the engine. Clean or replace a dirty element. Check the fuel filter and make sure that fuel can flow freely through it. Even a tiny amount of dirt can clog a filter enough to hinder flow to the carburetor. Replace the filter if it's dirty or over a season old. Clean the carburetor THOROUGHLY! Use a good quality carb cleaning spray and make sure the diaphragm isn't hardened or creased. Replace any part that's questionable. A way to test start the engine is to put a few drops of pure gasoline in the spark plug hole and quickly replace the plug and pull the cord to start it. If it starts for a moment the ignition system is good. Don't do this more than a few times cause a two stroke engine requires oil in the fuel to lubricate the rotating assembly and running straight fuel for more than a few seconds can damage the engine. Do not use starting fluid it damages two stroke engines.

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22' snapper walk behind mowewont start .cleaned spark plug and still wont start .swapped spark plugs from another mower that does work and the other mower starts with the snapper mower's spark plug .


You need several things for a running internal combustion engine:
  • Air
  • Spark (to start)
  • Fuel
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You've shown that you have a workable spark plug so far. Going from the above, consider as well
  • Fuel. Bad / old / contaminated fuel. Clogged fuel filter. If it's a motor that needs gas/oil mix, does your gas have the right oil mix?
  • Air: Dirty, clogged air filter or air inlet.
  • Spark. Is any electricity making it to that proven-workable spark plug?
  • Compression. For this one, the most likely problem (other than a toss-the-engine thing like a broken piston) would be if the spark plug is not tightened into the mount hole, allowing the air to leak out rather than compress.
  • Exhaust. Most lawn mowers will have a spark arrestor on the exhaust to make sure you don't set a dry yard on fire with your exhaust. It's often overlooked in diagnosing two-stroke engines. Make sure it's not clogged or blocked.
  • Lubrication. Is there oil of the right type, and up to a proper level on the dipstick. No oil equals way too much friction in the engine.
Good Luck!

DH

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What parts do i needed for a tune up on a kia 2004 saoda


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1 Answer

MY 1997 CHEVY LUMINA;S CHECK ENGINE LIGHT IS ON AND KEEPS READING A CODE OF RANDOM MISFIRE WHEN THEY CHECK IT ON THE MACHINE.IT WILL NOT STAY CRANKED AND HAS A BAD SHAKE TO IT WHEN IT IS CRANKED LIKE AIR...


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1 Answer

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