Putting the plug against the block to test spark can sometimes be misleading, you can get a sparkplug tester for a few pound, you can even get a tester that you can put round the HT lead to test the lead, this will be a more realible tool. you could have another dodgy coil but i would be tempted to check leads for possible damage. where the lead conects to top of plug they have a habbit of coming apart at this point.
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Originally Posted by Auldjo
Hello everyone.
Hopefully someone will be able to help me.
I recently became the owner of a Suffolk Punch mower manufactured in 1990 (so not too vintage). However, I have been unable to get a spark from the plug. I have replaced the plug, fuel tap, fuel line, petrol and oil, and have stripped, cleaned and reassembled the carb, hoping to be mowing sooner than later. Still getting no spark, I removed and replaced the ignition coil, hoping this would solve the problem. Testing the plug against the block, even after rechecking that all connections with the casting and the plug were sound and conducting, there is still no spark.
I am at a loss for a possible solution, and so hope someone will be able to help.
P.S What would be the likelihood of having two faulty ignition coils?
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