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What would cause no spark? the mower is a masport 8/02 two stroke. Will not start and I have changed spark plug and cleaned every thing but still nothing.

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Your spark plug wire may be damaged, or your magneto may be too weak to generate a spark. You also have a kill switch wired to your magneto, and a condensor. I would start by cleaning the contacts of the magneto and then check the gap between the magneto and the flywheel. The gap between the flywheel and magneto should be .010". I would start by checking the kill switch wire for damage. If any damage is suspected, replace the kill switch. Next, I would have the magneto tested or replaced. Also, check all your ground wires for damage, or loose contacts.

When you are checking for a spark, you should have the spark plug installed in the spark plug wire as normal, but not installed in the engine. The spark plug base should be grounded to the engine while trying to start and checking for a spark. If there is a weak spark, this is probably due to a worn magneto.

Posted on May 24, 2011

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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
  • Compression
  • Lubrication
  • Exhaust.
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

Apr 25, 2016 | Snapper Garden

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How to replace ignition coil


you need a valve job the hotter the motor the more unseated the valves

Jul 01, 2014 | Briggs & Stratton Briggs Stratton...

1 Answer

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few things to check fuel lines are connected properly one may have gotton losse offf or pinched then make sure the blades are in off position some its a lever or a pull/push switch and battery may have gone dead or distributor to spark or plugs

Apr 13, 2014 | Garden

1 Answer

How to fix a 3.5 lawn mower?


HELLO,
You can fix these yourself, all you have to do is to follow the instructions below,
1 Remove the spark plug lead from the spark plug and move away from cylinder head. Always do this before attempting any repairs to a lawnmower.
2 If your lawnmower is a "four stroke" mower (separate gasoline and oil), tip the mower so that the spark plug is pointing skyward. Never tip it on its side with the spark plug to the ground.
3 If your lawnmower is "2 stroke" (oil and gasoline mixed) turn off fuel tap. You can tip a two stroke mower any way that is suitable to you.
4 To change a blade, or blade disc, it is often easier to remove the spark plug and feed a length of string into the cylinder head to 'lock' the piston while trying to un-do the blade bolt(s).
5 Check the motor's "air filter" while doing this sort of maintenance as a dirty or clogged air filter will affect engine performance and increase fuel consumption of your mower. Symptoms of a clogged air filter include inability to start, starting and quickly stopping after several sputters, or a weak idle. You may also see oily or smoky exhaust.
6 If your mower is a "four stroke" model, change the oil at least once a year. When it is tipped over with the spark plug in the air, is a good time to remove the "oil fill" plug and drain oil into an old ice-cream container for recycling.


I hope this will help to solve the problem.....

May 31, 2011 | Craftsman Garden

3 Answers

Hi, I have a Masport 635 Lawn mower, I think it is 2 stroke, just petrol ( not mixed with oil ). I don't know anything about how to maintain mowers. But today I mowed the back yard, it went fine, then...


If it is two stroke it must have oil mixed in with it. Try pulling the cord and notice if there is any compression if not then it is the pistion and if it doesn't turn then it is seized with lack of oil.Now if it is four stroke take the plug out put it to the head and pull the cord to see if there is any spark if there is it's a fuel problem.

Jan 15, 2011 | Briggs & Stratton Briggs Stratton...

1 Answer

Hi, my masport 4 stroke mower is very difficult to start, ie the cord is very hard to pull. cheers


Make sure the shutoff brake is not dragging.that is the part that is down by the flywheel when you let go of the handle the motor stops.you might need a new cable if it is not releasing all the way.this would cause the pull cord to be hard to pull and hard to start.

Dec 28, 2010 | Garden

1 Answer

Cant start the mower, already replaced spark plug, airfilter is clean. When starting a small black cloud comes out so think it has to do with a oil filter, lost manual so cannot check, need to find a copy...


Black smoke is unburnt fuel. Whether it is poor spark, bad gas, etc. Also make sure your oil level is not over full as this can cause it to blow by the rings and foul the gas.

Apr 26, 2010 | Garden

1 Answer

Mower wont start


About the only suspect is water in the fuel - even after you drained it. If your Masport has a 'Quantum' style engine with a float type carb, undo the bowl nut and allow the float chamber to drain. Odds on there's water in it. A single drop will block the jet. If it's a 'carb-on-the-tank' engine, chech for water droplets in the bottom of the tank. They wll be obvious if present.

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1 Answer

Masport Lawnmower won't start


you likley will need a new air filter and a carb cleaning. when mowers are turned on their side. oil will seep past the piston and if your intake valve was open it can pass thru into the carb and also spoil your air filter. I am assumeing you have a paper air filter. start by taking off your air filter. then you should also pull the spark plug, place a rag covering the hole. then pull the cord a couple times. chances are that you will blow the oil out of the cylinder.

Mar 31, 2009 | Garden

1 Answer

My lawn mower doesn't start


Hi Every 2 stoke engine needs three things to run:Fuel+oil/air mixture in correct proportions,compression and ignition.Remove the sparkplug and see if the spark appears when the piston in the cilinder is at top death point(almoust),if not check the flyweel key(not to be sheared).Check engine"s sealing(crankcase gasket,cilinder gasket,seals-crankshaft,carb gasket).Also the mufller(not to be clogged),disassembly the carb (check and clean it),fuel lines and fuel filter (check and clean them),gas cap tank vent(not to be clogged),the air filter.Please let me know. best regards savumihai71

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