Small Engine Runs and Then I Cant Start It Again
How to Starting time a Pocket-sized Engine
Updated: Feb. 03, 2022
Give your starter-cord arm a residuum while y'all run these basic diagnostic tests
When a small engine won't beginning, the usual suspects are bad gasoline, a corroded or plugged carburetor, or a bad ignition ringlet.
Y'all might also like: TBD
Introduction
Y'all can set any of these problems yourself easily, cheaply and rapidly. You'll non only save lots of coin but too skip the hassle of hauling your lawn mower, snow blower, pressure washer or whatever to a service centre and home once again.
Typical professional repairs kickoff at about $100. Only if you practise the work yourself and guild the replacement parts online, you can ordinarily save plenty to justify replacing parts even if you lot're not sure they're bad. (Psep.biz is one source of disbelieve modest-engine parts.) We'll embrace a few bones tests, explain how to gild parts and show you lot how to supersede a carburetor, an ignition coil and a recoil starter. You can replace any defective parts in just a few hours with basic paw tools.
Check the basics beginning
Photograph i: Give information technology a boom of fuel
Remove the air filter and shoot a one-2nd burst of an aerosol petroleum-based lubricant (not starting fluid, silicone or Teflon spray) straight into the carburetor throat. Endeavour starting. If the engine starts and and then dies, that confirms you've got a fuel problem.
Engine bug may have their root in something very unproblematic. If your machine has a shutoff valve, cheque that first to make certain it'south in the On position. Next, make sure the engine has fresh gas. If the gas is more than xxx days erstwhile, supercede it with fresh, stabilized gas. Side by side, check the air filter to make certain information technology's not clogged.
If the tank has fresh gas and you've primed the carburetor and set the asphyxiate only information technology still won't start, it'due south time to remove the spark plug. If the spark plug is wet with gas, information technology proves the engine is getting fuel. Dry off the plug with compressed air and examine it for signs of carbon buildup or oil deposits. Check the gap to make certain it's within specs.
If you accept any doubts nearly the plug's condition, supervene upon information technology—they're cheap. If the plug is dry, it's a sign of a fuel trouble and most likely a messed-up carburetor. Shoot a substitute fuel (WD-forty or PB Blaster Lawn Mower Tune-Up) into the carburetor pharynx and and so try starting the engine (Photo 1). If it won't start or fire with spray fuel, you probably have an ignition system problem, most likely a bad ignition coil. However, if it starts and dies, that proves the ignition is working and the problem is fuel starvation.
Check the fuel filter start by disconnecting the fuel line from the filter to the carb. Gas should run out. If it doesn't, supercede the filter. If gas flows freely through the filter, then the problem is inside the carburetor.
Testing an ignition coil is a chip trickier. To do it correct, you need a small-scale-engine spark tester. Holding the spark plug boot close to the engine to check for spark isn't a reliable test because a bad curl can produce a spark in open air but fail when the cylinder is under compression. If you own several small-scale engines, it may pay to buy a tester To learn how to use it, read How to Examination an Ignition Coil. However, since the tester costs almost as much equally a new coil, replacing the curl without testing may exist the manner to go.
Find the right parts
Photo two: Shoot the model and serial numbers
Shoot a digital photo of the engine model and serial numbers and engagement of industry, equally well as any other engine data on the characterization. You'll need that info to order parts.
Lawn and garden tool manufacturers often use several different engine brands for a certain model, and then you tin't buy parts based on the model number of the mower or snow blower. Instead, you need the engine model and serial number and the date of manufacture to find the parts. This Toro lawn mower, for example, was built with a Tecumseh engine, while a dissimilar Toro mower may be built with a Briggs & Stratton engine. We found the Tecumseh engine information on a characterization (Photo 2). But other brands may stamp the numbers into the engine cake, valve comprehend or engine shield.
In one case you have the engine data, locate a parts list and exploded diagram by inbound the brand and model number into a search engine. Find the engine manufacturer's part number and enter that into a search engine to find the lowest price or nearest seller.
Carb rebuild vs. new carb
Photo three: Supervene upon the carb
Tighten a C-clamp on the gas line or turn the shutoff valve to Off. And so remove the fuel line and two carburetor hold-downward bolts. Rotate the carburetor to disconnect the throttle linkage. Opposite the procedure to install the new carburetor.
These days we don't recommend rebuilding a carburetor. First, a make new carburetor from a discount online seller usually costs less than a rebuild kit and a bucket of carburetor soaking solution. Plus, rebuilding a carburetor is fourth dimension consuming and doesn't always work, peculiarly if the internal parts are corroded.
In one case you take the new carburetor in hand, remove the old one and swap in the new unit (Photo 3). After yous reinstall the fuel line and prime number the engine, it should start correct up.
Supplant an ignition curl
Photo 4: Remove the old coil
Remove the 2 coil retaining screws. The instant they're loose, the coil will snap confronting the magnet on the peak of the crankshaft. Grab the coil and yank it off the magnet.
Photograph 5: Install the new coil
Prepare the new whorl in place and snug the retaining screws, simply don't tighten them all the way. Align the crankshaft magnet to the center of the coil. Fix the air gap using a business concern card as a judge. Move the coil in and out until y'all experience a slight drag on the card. So tighten the coil screws. Check the gap again. If it's right, reinstall the engine shield and cover.
If you've adamant that you take a weak spark or no spark, go ahead and buy and install a new roll. Get-go by removing the plastic engine comprehend and setting it bated. And so elevator off the gas tank and remove whatever engine shields to access the ignition coil. Remove the one-time coil (Photo 4). Then install the new coil and set the air gap (Photo 5).
Replace a recoil starter
Photo half dozen: Supersede the recoil starter assembly
Remove the engine cover retaining screws and lift the cover off the engine. Next, remove the recoil associates hex-head screws. And so lift off the quondam unit and drop in the new 1. Reverse the procedure to reinstall.
If the starter rope is cleaved, you can purchase a recoil rebuild kit for about $fifteen. The kit contains a new rope, dogs and dog springs. Setting the proper spring tension can exist tricky, and if yous get it incorrect, yous'll break the jump and accept to supersede the entire unit of measurement. Frankly, we recommend skipping the rebuild and merely replacing the entire recoil assembly (Photo half dozen). It'due south much faster, and the complete assembly includes a new housing and bound (ready to the proper tension).
Required Tools for this Projection
Accept the necessary tools for this DIY project lined upwardly earlier you start—you lot'll save fourth dimension and frustration.
You'll likewise need a blower attachment for the compressor (or canned air) and a paper prune.
Required Materials for this Projection
Avoid last-minute shopping trips past having all your materials ready ahead of time. Here's a list.
Originally Published: November 27, 2018
Source: https://www.familyhandyman.com/project/two-cycle-small-engine-start-up-tips/
0 Response to "Small Engine Runs and Then I Cant Start It Again"
Post a Comment