If it is running a waste fire spark system, yes it is entirely possible. It is common and there is nothing wrong with the practice. The plug will fire at the top of the compression stroke as well as the top of the exhaust stroke.
-----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Mac McConnell-Wood via KRnet Sent: Monday, May 25, 2015 5:55 PM To: KRnet Cc: Mac McConnell-Wood Subject: Re: KR> Engine miss Back in the '60's when Ho...a's- started exporting , - the squadron I was on in Malaysia bought a whole bunch of Cubs. Were a bit hacked off when the plugs started failing after a short time -our resident engineer reckoned that due to a design fault the ignition was firing twice in the 4 stroke cycle -and burning out the plugs -is this possible?
