With no external signal to the coil negative primary post, voltage would travel through the ignition coil windings without inducing any secondary spark. Click here to read more. I disconnected the wires at the box, and checked spark at all 6 cylinders. 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. A switch, or signaling device, triggers an interruption in the circuit. To help you in your search, we have completed this list of the Best 2 Stroke Spark Plug. To start viewing messages, select the forum that you want to visit from the selection below. Posts: 9,551. Any help will be much appreciated! The remaining operations of the two stroke compression ignition engine are exactly the same. What causes this? No spark; weak spark: Spark plug fouled, broken, or misgapped. It is damaging and not necessary. I dunked my 57" Arrow Shark Fighter Cat and got it running again, but only for about 5 minutes then it died. Still no spark on either plug. Faulty or damaged coils will have weak or no output. That is I remove the plugs. The ethanol that is added to our gas nowadays is one of the biggest culprits. Just this weekend I was working on my '91 Kawasaki 550. Hello this is my first post so if i'm missing crucial information please let me know, I bought a GT500 awhile back and i finnaly got the time to try and fire it up. I have a 2000 Yamaha 2 stroke that has run flawlesly since I bought it two years ago. I have replaced the spark plug so its not the plug. as those of the spark ignition engine. There are two different types of ignition and electrical systems on lawnmowers. 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. 0 Kudos BluewaterBill. High voltage is then generated in the coil windings. If this fails then there exists the possibility the ignition moduel is at fault. I have been through the carb twice and I think it is ok. No spark at all tends to indicate that the power is not getting to the points. and the fuel (diesel) is injected by an injector fitted in the head of the cylinder. The result will be an engine that performs badly, if it starts at all. Went through and found I had no spark. i am putting the NEW spark plug against the head,frame,and shock and nothing. Suzuki 2-Strokes: Gt550 1973. I haven't started it it in over a year. I agree with tester, spark plug should be checked first, then the compression and or carb, the filters (air and fuel)...if you aren't getting a spark then the spark plug needs replacement have the dudes at your 2 stroke engine repair place show you the correct gap, how to clean the thingys that make the gap as they get gooed quickly, only use NO ETHANOL gas! You may have to register before you can post: click the register link above to proceed. The ignition coil or module for a two-stroke engine regulates the ignition power, and converts it to charging electricity for the battery system. BUT on my 2 stroke Victa there is no flywheel key. I’ve got a 2012 115 Yamaha four stroke. 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. The overwhelming majority of two stroke engines have spark plugs. 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. 97 Mercury 20 HP 2-stroke NO SPARK June 25th, 2018, 06:32 AM. I have a 2 stroke geely that dont have any spark, I changed the coil and stator with another one and still no spark? Registered: ‎07-14-2011. Ignition Module Failure. Our machines ran FINE without it and no small engine likes it. I have a 90 hp Yamaha 2 stroke .I replaced the cdi and i have no spark on cylinder 2&3 .I think the coils are bad #1 is firing so I switched coils and now no fire on 1.But I can take the 2&3 wires fro … read more Rod October 2008: It sounds almost as if the position of the coil, in relation to the flywheel has been fractionally adjusted. I am troubleshooting issues with my 2002 YZ125 tha was recently rebuilt. There is the battery driven and the engines without batteries. thanks Posted by tony evans on Aug 24, 2013. I hit the stop button but nothing happened. I swapped the coil and plugs out and still no spark! I have two 89 225 o.m.c sea drive i have no spark from the spark plugs and i did all i know how to do and to them Report Inappropriate Content. Rest assure, by following this trouble shooting guide, ... No Spark: 4: Check blue and black wire connections coming from motor to the connections to CDI module. The engine will run clean sometimes and then sputters and backfires and quits. Modern replacements are heavy and expensive. took the old plug and gapped it about a quarter inch and not a spark. The Flymos have no numbers. I did. Cleaned the carbs etc. Message 6 of 13 (27,138 Views) Reply. Air/fuel mixture incorrect: Idle air screw mis-set. Does this mower have a condenser? Typically, this problem happens when the contact points become worn, or more precisely when the contact point's heel becomes worn. Re: Need help! I think there are problems with the ignition. and tried to start it but there was no spark. The engines then turn easily and the plug can be earthed to the cylinder and the starter rope pulled. If no spark you'll have to remove the blower housing and check the ground wire back to the coil, checking that it is not shorting along the way. 1. If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. The stator is relatively new about 4 months old. 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. Spark plug cap not in good contact with spark plug. Admiral. If it sparks then it is the fixing at the control plate that is earthing out. Loose wire connector. Testing for a spark. There is no spark plug in this engine. The spark seems somewhat weak. Strong Spark 4. The upward movement of the piston creates a partial vacuum in the crankcase. Derbi) which use the same ignition. If you are looking for top quality Best 2 Stroke Spark Plug, read the detailed reviews on top 10 Best 2 Stroke Spark Plug before buying. So I decided to do some preventative maintenance on my 20 hp Merc. I took off both spark plug cables and it continued to rev. Top 10 Best 2 Stroke Spark Plug Last weekend it would not start. When the module and coil begin to fail, it's typically because the units have been burned out. from the bottom dead center to the top dead center. CDI unit faulty. Clean Air 3. Got a 2010 250 exc... my bike decided to just stop.workong after riding one day. Compression (around at least 90 PSI on a 2 stroke like yours) 2. I noticed a bunch of corrosion on the spark plug cables, so I decided to pull them and clean them. No spark, no voltage going to the coil packs when cranking. Other two-stroke engines might pump lubrication from a separate tank of two-stroke oil. Hey guys first time poster here. Post by Vitoow » Sun Dec 20, 2020 6:38 pm. Want Answer 0. Once you have confirmed that the stop switch is working, reconnect the spark plug lead. Receiving voltage from the CDI unit the coil will amplify voltage and shoot it through to the spark plug. It's getting fuel, but no spark. On any other lawnmower this suggest that the flywheel key has sheared. This led to a marked reduction in spark plug fouling, which had previously been a problem in two-stroke engines. I disconnected tha battery, nothing. ... Answer: 2-stroke engines don't have a sump (reservoir) containing oil. Pull the cord, cord jams half way (or pulls back), no spark because the flywheel isn't spinning fast enough to produce electricity through the magneto (coil). i have a 2 stroke chainsaw motor on a little pocket bike i cleaned ALL connections and when i turn it over the wire will give me a pretty good shock if im up against the frame. Check power to the points as indicated by the previous posts. It was running fine with the water hose attached when it started over revving. While moving up, it compresses the air-fuel mixture in the combustion chamber. No spark. If you are pulling a start cord you don’t have a battery. In this two stroke engine, only air is compressed inside the cylinder. Engine turns over just fine. Was running Awesome!! 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. Magneto damaged. Because the ignition module is electronic and does not utilize moving components, it is normally one of the most reliable part of the engine. Here is what I have done so far. Spark plug cap or high tension wiring faulty. Had spark on all cylinders except 3 and 5. How do i get spark. Since then i have spent hours upon hours trying to get it to spark with no luck. Having problems with your 2 stroke bicycle engine? The motor started and ran fine days before this. Engine stop switch stuck closed. I can't seem to find anybody that know how to hook up the two wires from the ignition coil, red and black. 2 stroke engine.. no spark; If this is your first visit, be sure to check out the FAQ by clicking the link above. Diagnosing no spark on a Lawnmower engine. 2 Stroke no spark help? Mercury 115 inline won't start, no spark. Upward Stroke in 2 Stroke Spark Ignition Cycle: During upward stroke of a 2 stroke spark ignition cycle, the piston moves upward i.e. 8. OK, thanks for the reassurance. They are very light and the 2 stroke engines run at high speed. Often a faulty CDI unit will see intermittent or no spark on cylinders and may only breakdown when your engine warms up. All 50cc Piaggio and Gilera 2-stroke engines plus some geared 50cc (e.g. GT500 no spark. no spark on Victa lawnmower 2 stroke? 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. Ignition Coil. It's assumed you have and know how to work a multimeter! I ordered a 49cc 2 stroke engine off of ebay about three weeks ago. 2 Stroke Trouble Shooting Guide; 2 Stroke Trouble Shooting Guide. can any one help? Your machine has to HAVE these things to Start and to Run 1. 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