My power for the sparkplug is supplied bya magneto setup similar to a mower. What baffles me is that it has a start and stop switch one end of which is connected to the condenser then other end follows the sparkplug lead for a short distance and was then cut off? where should that have gone?Earth? so engine would stop if switched to that side?.My engine is an early Valmet single cylinder 2 stroke engine if that helps any?
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I am not sure what you mean by "Have power going through the whole block." You will have to supply more information on your engine, as there are many different kinds of magnetos, and they work different ways.
Could be a short in the coil for the sparkplug. Check the magneto- pull the plug wire off the spark plug and hold it close to the frame of the while someone tries to start it. Keep all parts of your body clear of the mower- only hold the sparkplug wire. When the motor turns over, verify spark from the wire to the frame. If no spark, you likely have a bad magneto coil. If you have a good spark, try taking the air filter off and use some engine starter fluid (not much) and then try and start again. If it starts and runs for a second with the starter fluid, you probably have a problem with your fuel not getting in, which leads to troubleshooting the carb and intake.
if you spark a little starting fluid to it does it fire?if so then fuel is the problem then is the gas older than 30 days dump it out and try fresh gas if new gas then open the carb and clean it if it does not fire on starting fluid check for spark if no spark pull the top cover from the engine and look for wiring damage unplug the coil from the engine side of the coil and check for spark if no spark then the coil is bad and if its a riding mower the carb might have a anti back fire valve that could stick closed
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yes buddy the cdi ,coil,magneto use a electrical metre to check these out the magneto on the side off engine inside the casing the magneto will be a box with out fins and the coil will be coming from your sparkplug also replace plug this could be the cause if not check power to the coil if not check power to the coil if not the magneto is you problem