There is the battery driven and the engines without batteries. Since then i have spent hours upon hours trying to get it to spark with no luck. With no external signal to the coil negative primary post, voltage would travel through the ignition coil windings without inducing any secondary spark. While moving up, it compresses the air-fuel mixture in the combustion chamber. If there's no sign of a spark, try a new one or even a plug from a lawn mower (to test the ignition circuit is okay) before you attempt any more in depth troubleshooting. To help you in your search, we have completed this list of the Best 2 Stroke Spark Plug. I dunked my 57" Arrow Shark Fighter Cat and got it running again, but only for about 5 minutes then it died. That is I remove the plugs. from the bottom dead center to the top dead center. Suzuki 2-Strokes: Gt550 1973. I haven't started it it in over a year. Registered: ‎07-14-2011. There is no spark plug in this engine. Air/fuel mixture incorrect: Idle air screw mis-set. If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. The overwhelming majority of two stroke engines have spark plugs. If it sparks then it is the fixing at the control plate that is earthing out. Loose wire connector. I bypassed the kill switch thinking it may have corroded the kill switch, but still no spark. With all those washers and things, it's not hard to connect the points wires in a way that they either short out or don't make a connection. Modern replacements are heavy and expensive. This led to a marked reduction in spark plug fouling, which had previously been a problem in two-stroke engines. 1. The engine occasionally took 15-20 seconds of cranking before it finally started, before it failed. It's getting fuel, but no spark. I have been through the carb twice and I think it is ok. No spark; weak spark: Spark plug fouled, broken, or misgapped. Two-stroke oils, which became available in the 1970s, are specifically designed to mix with petrol and be burnt with minimal unburnt oil or ash. Hi My huskvarna wr 250 two stroke has no spark to the spark plug I have tried disconnecting the kill switch and have checked the wiring and have a new spark plug what else can I try. Disconnected the kill switch to check for short. On any other lawnmower this suggest that the flywheel key has sheared. Because the ignition module is electronic and does not utilize moving components, it is normally one of the most reliable part of the engine. They are very light and the 2 stroke engines run at high speed. Hey guys first time poster here. Posts: 9,551. Diagnosing no spark on a Lawnmower engine. I cranked her over, she sounded like she wanted too, shot a small spray of starting fluid in there and she fired right up, then had spark on all 6. I disconnected the wires at the box, and checked spark at all 6 cylinders. I am troubleshooting issues with my 2002 YZ125 tha was recently rebuilt. The ethanol that is added to our gas nowadays is one of the biggest culprits. Does this mower have a condenser? Any help will be much appreciated! thanks Posted by tony evans on Aug 24, 2013. Check power to the points as indicated by the previous posts. Had spark on all cylinders except 3 and 5. Typically, this problem happens when the contact points become worn, or more precisely when the contact point's heel becomes worn. Here is what I have done so far. Crank, no start. Upward Stroke in 2 Stroke Spark Ignition Cycle: During upward stroke of a 2 stroke spark ignition cycle, the piston moves upward i.e. This problem can only happen on a 2-stroke because there are no valves to be operated in a set sequence, as in a 4-stroke engine. I ordered a 49cc 2 stroke engine off of ebay about three weeks ago. I think there are problems with the ignition. I did. Ignition coil faulty. Just this weekend I was working on my '91 Kawasaki 550. Strong Spark 4. The remaining operations of the two stroke compression ignition engine are exactly the same. I can't seem to find anybody that know how to hook up the two wires from the ignition coil, red and black. I have replaced the spark plug so its not the plug. A switch, or signaling device, triggers an interruption in the circuit. So I decided to do some preventative maintenance on my 20 hp Merc. and the fuel (diesel) is injected by an injector fitted in the head of the cylinder. There are two different types of ignition and electrical systems on lawnmowers. ... Answer: 2-stroke engines don't have a sump (reservoir) containing oil. The stator is relatively new about 4 months old. When the module and coil begin to fail, it's typically because the units have been burned out. Still no spark on either plug. I noticed a bunch of corrosion on the spark plug cables, so I decided to pull them and clean them. In this two stroke engine, only air is compressed inside the cylinder. Last weekend it would not start. The Flymos have no numbers. Ill see how the big cooler lines up and if it looks awkward Ill just stick with the 600s. Want Answer 0. The best option is to use a spark tester which plugs into the spark plug lead (instead of the plug) and is clipped to an earth point on the moped engine. I have a 2 stroke geely that dont have any spark, I changed the coil and stator with another one and still no spark?